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Overview of Fractures, Dislocations, and Sprains

by Danielle Campagne, MD

Bones may break (called fractures), bones in joints may become separated from each other (called dislocations), and tears may occur in ligaments (called sprains), muscles (called strains), and tendons (called a tendon rupture).

  • Most injuries to bone, muscles, and the tissues that connect them result from injuries or overuse.

  • The injured part hurts (especially when it is used), is usually swollen, and may be bruised or look distorted, bent, or out of place.

  • Other injuries, such as blood vessel and nerve damage, compartment syndrome, infections, and long-lasting joint problems, may also be present or develop.

  • Doctors can sometimes diagnose these problems based on symptoms, the circumstances causing the injury, and results of a physical examination, but sometimes x-rays or other imaging tests are needed.

  • Most injuries heal well and result in few problems, but how long they take to heal varies, depending on many factors, such as the person's age, the type and severity of the injury, and other disorders present.

  • Treatment depends on the type and severity of the injury and may include pain relievers, PRICE (protection, rest, ice, compression, and elevation), maneuvers or procedures to move the injured parts back into their normal position (reduction), immobilization of the injured part (for example, with a cast or splint), and sometimes surgery.

Bones, muscles, and the tissues that connect them (ligaments, tendons, and other connective tissue, called soft tissues) make up the musculoskeletal system. They give the body its form, make it stable, and enable it to move.

Tissues of the musculoskeletal system can be damaged in various ways:

  • Bones can be cracked or broken (fractured). Usually, the surrounding tissues are also injured.

  • The bones in joints may become completely separated from each other (called dislocation) or only partly out of position (called subluxation).

  • Ligaments (which attach bone to bone) can be torn (sprained).

  • Muscles can be torn (strained).

  • Tendons (which attach muscle to bone) can be torn (ruptured).

Fractures, dislocations, sprains, and strains (called musculoskeletal injuries) vary greatly in severity and in the treatment needed. For example, fractures can range from a small, easily missed crack in a foot bone to a massive, life-threatening break in the pelvis. Fractures can break the skin (called open fractures) or not (called closed fractures).

Sprains and strains can be mild, moderate, or severe. Ligaments, muscles, and tendons may be completely or partially torn. If a tendon is completely torn, the affected body part usually cannot move. If only part of the tendon is torn, movement is unaffected, but the tendon may continue to tear and may later tear completely, particularly if people put substantial pressure on the affected part.

An injury that breaks a bone may also seriously damage other tissues, including the skin, nerves, blood vessels, muscles, and organs. These injuries can complicate treatment of the fracture and/or cause temporary or permanent problems.

Most often, the limbs are injured, but any body part, such as the head (see Head Injuries), face (see Facial Injuries), eyes (see Overview of Eye Injuries), ribs (see Chest Injuries), or spine (see Compression Fractures of the Spine), can be.


Trauma is the most common cause of musculoskeletal tissues. Trauma includes

  • Direct force, as occurs in falls or motor vehicle accidents

  • Repeated wear and tear, as occurs during daily activities or results from vibration or jerking movements

  • Overuse, as may occur when athletes overtrain

How severe an injury is depends partly on how strong the force is. For example, a fall on level ground usually causes minor fractures, but a fall from a tall building can cause severe fractures that involve several bones.

Some injuries occur while playing certain sports (see Sports Injuries).

Some disorders, such as certain infections, bone tumors (which may be cancerous or not), and osteoporosis (see Osteoporosis), can weaken bone. People with one of these disorders are more likely to break a bone, even when only slight force is involved. Such fractures are called pathologic fractures.


The most obvious symptom of musculoskeletal injuries is

  • Pain

The injured part hurts, especially when people try to put weight on it or use it. The area around the injury is tender to the touch. Other symptoms include

  • Swelling

  • A part that looks distorted, bent, or out of place

  • Bruising or discoloration

  • Inability to use the injured part normally

  • Possibly loss of feeling (numbness or abnormal sensations)

The injured part (such as an arm, a leg, a hand, a finger, or a toe) often cannot be moved normally because movement is painful and/or a structure (bone, muscle, tendon, or ligament) is torn, broken, or out of place. When muscles around the injured area try to hold a broken bone in place or compensate for other injuries, muscle spasms may occur, causing additional pain.

Bruises appear when bleeding occurs under the skin. The blood may come from blood vessels in a broken bone or in the surrounding tissues. At first, the bruise is purplish black, then slowly turns green and yellow as the blood is broken down and reabsorbed back into the body. The blood can move quite a distance from the fracture, causing a large bruise or a bruise some distance from the injury. It can take a few weeks for blood to be reabsorbed. The blood can cause temporary pain and stiffness in the surrounding structures. For example, shoulder fractures can bruise the entire arm and cause pain in the elbow and wrist. A bruise on the forehead can cause a bruise to later appear under the eyes.

Because moving the injured part is so painful, some people are unwilling or unable to move it. If people (such as young children or older people) cannot speak, refusal to move a body part may be the only sign of a fracture or other injury. However, some fractures do not keep people from moving the injured part. Being able to move an injured part does not mean that there is no fracture.


Musculoskeletal injuries can be accompanied by or lead to other problems (complications). However, serious complications are unusual. The risk of serious complications is increased if the skin is torn or if blood vessels or nerves are damaged. Dislocated joints, unless they are realigned quickly, are more likely to damage blood vessels and nerves than are fractures.

Some complications (such as blood vessel and nerve damage, compartment syndrome, fat embolism, and infections) occur during the first hours or days after the injury. Others (such as problems with joints and healing) develop over time.

Blood vessel damage

Many fractures and other musculoskeletal injuries cause noticeable bleeding around the injury. Rarely, bleeding within the body (internal bleeding) or from an open wound (external bleeding) is massive enough to cause a life-threatening drop in blood pressure (shock—see Shock). For example, shock may result when fractures of the thighbone (femur) cause severe internal bleeding or when fractures of the pelvis cause massive internal bleeding. If a person is taking a drug to prevent blood clots from forming (an anticoagulant), relatively minor injuries can cause substantial bleeding.

A dislocated hip or knee can disrupt blood flow to the leg. Thus, the tissues in the leg may not get enough blood (called ischemia) and may die (called necrosis). If enough tissue dies, part of the leg may have to be amputated. Certain elbow injuries can disrupt blood flow to the forearm, causing similar problems. A disrupted blood supply may not cause any symptoms until several hours after the injury.

Nerve damage

Sometimes nerves are stretched, bruised, or crushed when a bone is fractured or a joint is dislocated. A direct blow can bruise or crush a nerve. Crushing causes more damage than bruising. These injuries usually heal on their own over weeks to months to years, depending on the severity of the injury. Some nerve injuries never heal completely.

Rarely, nerves are torn, sometimes by sharp bone fragments. Nerves are more likely to be torn when the skin is torn. Torn nerves do not heal on their own and may have to be repaired surgically.

Fat embolism

Fat embolism rarely occurs. It usually occurs when long bones (such as the thighbone) are fractured and release fat from the bone's interior (marrow). The fat may travel through the veins, lodge in the lungs, and block a blood vessel there. As a result, the body does not get enough oxygen, and people may become short of breath and have chest pain. Their breathing may become rapid and shallow, and their skin may become mottled or blue.

Compartment syndrome

Rarely, compartment syndrome (see Compartment Syndrome) develops. For example, it may develop when injured muscles swell a lot after an arm or a leg is broken. Because the swelling puts pressure on nearby blood vessels, blood flow to the injured limb is reduced or blocked. As a result, tissues in the limb may be damaged or die, and the limb may have to be amputated. Without treatment, the syndrome can be fatal. Compartment syndrome occurs most often in people who have fractures of both lower leg bones (tibia and fibula—see Leg Fractures) or a Lisfranc fracture (a type of foot fracture—see Foot Fractures).


If the skin is torn when a bone is broken, the wound may become infected, and the infection may spread to the bone (called osteomyelitis—see Osteomyelitis). This infection is very difficult to cure.

Joint problems

Fractures that extend into a joint usually damage the cartilage at the ends of bones in the joint (called joint surfaces). Normally, this smooth, tough, protective tissue enables joints to move smoothly. Damaged cartilage tends to scar, causing osteoarthritis (see Osteoarthritis (OA)), which makes joints stiff and limits their range of motion. The knee, elbow, and shoulder are particularly likely to become stiff after an injury, especially in older people.

Physical therapy is usually needed to prevent stiffness and help the joint move as normally as possible. Surgery is often needed to repair the damaged cartilage. After such surgery, the cartilage is less likely to scar, and if scarring occurs, it tends to be less severe.

Severe sprains can make a joint unstable. Appropriate treatment, often including a cast or splint, can help prevent permanent problems.

Problems with healing

Sometimes broken bones do not grow back together as expected. They may

  • Not grow back together (called nonunion)

  • Grow back together very slowly (called delayed union)

  • Grow back in the wrong position (called malunion)

These problems are more likely to occur when

  • The broken bones are not kept next to each other and are not kept from moving (immobilized).

  • The blood supply is disrupted.

Certain disorders, such as diabetes and peripheral vascular disease, and certain drugs, such as corticosteroids, can delay or interfere with healing.

Pulmonary embolism

Pulmonary embolism (see Pulmonary Embolism (PE)) is the most common fatal complication of serious fractures of the hip or pelvis. It occurs when a blood clot forms in a vein, breaks off (becoming an embolus), travels to a lung, and blocks an artery there. As a result, lung tissue may die, and the body may not get enough oxygen.

Having a hip fracture greatly increases the risk of pulmonary embolism because it involves

  • Injury to the leg, where most of the clots that cause pulmonary embolism form

  • Forced immobility (having to stay in bed) for hours or days, slowing blood flow and thus giving clots the opportunity to form

  • Swelling around the fracture, which also slows blood flow in the veins

About one third of people who die after a hip fracture die of pulmonary embolism. Pulmonary embolism is much less common when the lower leg is broken and is very rare when the arm is broken.


When blood flow to a bone is disrupted, part of the bone may die, resulting in osteonecrosis (see Osteonecrosis). Certain injuries (such as certain wrist fractures and a dislocated hip, particularly if it is not realigned quickly) are more likely to cause osteonecrosis.


  • A doctor's evaluation

  • X-rays to identify fractures

  • Sometimes magnetic resonance imaging or computed tomography

If a musculoskeletal problem occurs suddenly, people must decide whether to go to an emergency department, call their doctor, or wait and see whether the problem (pain, swelling, or other symptoms) go away and lessen on their own.

People should be taken to an emergency department, often by ambulance, if any of the following apply:

  • The problem is obviously serious (for example, if it resulted from a car crash or if people cannot use the affected body part).

  • They suspect that they have a fracture (a possible exception is a toe or fingertip injury).

  • They suspect they have a severe soft-tissue injury (such as a dislocation, torn tendon, or severe sprain or strain).

  • They have several injuries.

  • They have symptoms of a complication—for example, if they lose sensation in the affected body part, they cannot move the affected part normally, the skin feels cool or turns blue, or the affected part is weak.

  • They cannot put any weight on the affected body part.

  • An injured joint feels unstable.

People should call a doctor when

  • The injury causes pain or swelling, but they do not think the injured part is fractured or severely injured.

If none of the above apply and the injury seems minor, people can call the doctor or wait and see whether the problem goes away on its own.

If injuries result from a serious accident, the doctor's first priority is

  • To check for severe injuries and complications, such as an open wound, nerve damage, significant blood loss, disrupted blood flow, and compartment syndrome (see Compartment Syndrome)

For example, doctors check for numbness, measure blood pressure (which is low in people who have lost a lot of blood), check pulses (which are absent or weak when blood flow is disrupted), and look for other signs of disrupted blood flow, such as skin that is pale and cool. If any of these injuries and complications are present, doctors treat them as needed, then continue with the evaluation.

Description of the injury

Doctors ask the person (or a witness) to describe what happened. Often, the person does not remember how an injury occurred or cannot describe it accurately. Knowing how the injury occurred can help doctors determine the type of injury. For example, if a person reports that a snap or pop occurred, the cause may be a fracture or an injury to a ligament or tendon. Also, doctors ask in which direction the joint was stressed during the injury. This information can help doctors determine which ligaments and/or bones are damaged.

Doctors also ask when the pain started. If it started immediately after the injury, the cause may be a fracture or a severe sprain. If the pain began hours to days later, the injury is usually minor. If the pain is more severe than expected for the injury or if the pain steadily worsens during the first hours after the injury, compartment syndrome may have developed or blood flow may be disrupted.

Physical examination

The physical examination includes the following (in order of priority):

  • Checking for damage to blood vessels near the injured body part—for example, by checking pulse and skin temperature and color

  • Checking for damage to nerves (for example, checking sensation) near the injured part

  • Examining and moving the injured part

  • Examining the joints above and below the injured part

Doctors gently feel the injured part to determine whether bones are in pieces or out of place and whether the area is tender. Doctors also check for swelling and bruising. They ask whether the person can use, put weight on, and move the injured part.

Doctors test the stability of a joint by gently moving it, but if a fracture is possible, x-rays are done first to determine whether moving the joint is safe. Doctors check for grating or crackling sounds (crepitus) when the injured part is moved. These sounds may indicate a fracture.

Moving the affected joint can also help doctors determine the severity of an injury. For example, they can determine how severe a sprain (a torn ligament) is based on how far they can move the joint and how painful the movement is. When a ligament is partially torn, moving the joint is very painful. When a ligament is completely torn, moving the joint is less painful because the torn ligament is not being stretched as the joint is moved. A joint can usually be moved more freely when a ligament is torn than when it is not and can be moved more freely when a ligament is completely torn than when it is partially torn.

Because tendons connect muscles to bone, doctors can often determine the severity of a tendon injury by moving the muscle that the tendon is attached to. When a tendon is completely torn, moving the muscle attached to the tendon may not move the bone. For example, if the Achilles tendon (which attaches the calf muscles to the heel bone) is completely torn, the foot may not move. Partial tears may be hard to detect because the joint may seem to move normally.

Doctors also check the joint above and below the injured joint.

If pain or muscle spasms interfere with the examination, the person may be given a pain reliever and/or muscle relaxant by mouth or injection, or a local anesthetic may be injected into the injured area.

Doctors may check sensation in the skin—whether the person can feel normally—and ask whether the person has abnormal sensations, such as a pins-and-needles sensation or tingling. Abnormal sensations suggest that nerves have been damaged.

Doctors may check pulses and the color and temperature of the skin to determine whether an artery is damaged or compartment syndrome has developed.


Imaging tests used to diagnosis musculoskeletal injuries include

  • X-rays

  • Magnetic resonance imaging (MRI)

  • Computed tomography (CT)

X-rays are the most important and usually the first and only test done to diagnose a fracture. X-rays are also useful for diagnosing dislocations. X-rays are not useful for detecting injuries to ligaments, tendons, or muscles because they show only bones (and the fluid that collects around an injured joint).

X-rays are usually taken from at least two angles to show how the fragments of bone are aligned. These routine x-rays may not show small fractures when the pieces of broken bone remains in place (that is, they do not separate into fragments). Such fractures are called occult (hidden) fractures. So sometimes additional x-rays are taken from different angles. Occasionally, doctors wait to take x-rays for a few days or even weeks because some occult fractures (such as rib fractures—see Rib Fractures—and stress fractures—see Stress Fractures of the Foot) become visible on x-rays only after the fracture begins to heal and calcium is deposited in the new bone.

If x-rays show a fracture in a bone that looks abnormal (for example, if areas of bone look unusually thin), the fracture probably occurred because a disease (such as osteoporosis) weakened the bone.

X-rays are not always needed, depending on which body part is affected and what doctors suspect. For example, if an injured body part (such as the toes, except the big toe) would be treated the same way regardless of whether it is a fractured, x-rays are usually not needed.

CT or MRI may be done when

  • Results of the examination strongly suggest a fracture but x-rays do not show one.

  • A specialist needs more detailed views of the fracture to determine the best way to treat it.

Sometimes doctors apply a splint and re-examine the person days later and, if symptoms are still bothersome, take another x-ray.

CT and MRI may also be done to provide more detail about fractures than routine x-rays can show. CT can show the fine details of a fractured joint surface and areas of a fracture that are covered by undamaged bone. CT and particularly MRI can show soft tissues, which are not usually visible on x-rays. MRI shows the tissues around the bone and thus helps detect injury to nearby tendons, ligaments, cartilage, and muscle. It can show changes caused by cancer. MRI also shows injury (swelling or bruising) within the bone and can thus detect small fractures before they appear on x-rays.

Did You Know...

  • X-rays show only bones and thus usually cannot help doctors identify injuries such as sprains, strains, and tendon injuries, even severe ones.

Other tests may include

Types of fractures

Imaging tests enable doctors to identify the type of fracture and describe it precisely.

Deciphering Medical Terms for Fractures




The broken pieces of bone are not in a straight line. One is at an angle in relation to the other.


A piece of bone is pulled off from the main part of the bone. A ligament may pull off a piece of bone if the external force is strong enough, as may occur in a fall. A tendon may pull off a piece of bone if the attached muscle contracts forcefully enough, as may occur in young athletes.

Avulsion fractures usually occur in the hand, foot, ankle, knee, or shoulder.


The skin over the fractured bone is not torn.


The bone is broken into three or more pieces. Often, the bone is broken into many very small pieces.

These fractures are often caused by a great force, as occurs in a car crash. They can also occur in people with osteoporosis, which weakens bone.


The bone collapses into itself.

These fractures usually occur in older people (particularly those with osteoporosis). The backbones (vertebrae) are often affected (called vertebral crush fractures).


The pieces of broken bone are separated.


The bone is partly cracked and/or bent but not completely broken through.

Greenstick fractures occur only in children.

Growth plate

These fractures occur in the growth plate, which is made of cartilage. Growth plates enable bones to lengthen until children reach their full height. When growth is completed, growth plates are replaced by bone. When a growth plate is fractured, the bone may stop growing or grow crookedly.

Growth plate fractures occur only in children and adolescents.


One end of the broken bone is jammed into the other. As a result, the bone appears shortened.

Joint (intra-articular)

This type of fracture extends into the cartilage at the ends of bones that form a joint (called joint surfaces). Normally, this cartilage reduces the amount of friction that occurs when bones in a joint rub against each other. When this cartilage is fractured, people cannot move the joint as well, and osteoarthritis is more likely to develop in the joint.


The pieces of broken bone are still in place (aligned normally), and there is no space between them.


The bone is broken in a straight line diagonally across the long middle part (shaft) of the bone.


These small fractures are difficult or impossible to see on x-rays, but they may be seen on other imaging tests such as computed tomography (CT) or magnetic resonance imaging (MRI).

After a few days or weeks, changes occur in the new bone that forms as the bone heals. Then occult fractures may be seen on x-rays.

Some stress fractures are occult.


The skin and tissues covering the fractured bone are torn, and the bone may be sticking out of the skin. Dirt, debris, or bacteria can easily contaminate the wound and may cause an infection in the broken bone.


These fractures result from osteoporosis (progressive loss of bone density), which weakens bones and makes them more likely to break.

Osteoporotic fractures (sometimes called fragility fractures) occur in older people, usually in the hips, wrists, spine, shoulders, or pelvis.


This type of fracture is caused by a disorder that weakens a bone, such as osteoporosis, certain bone infections, or bone tumors.


There are two separate breaks in a bone. Segmental fractures are a type of comminuted fracture.

Spiral (torsion)

These fractures occur when the bone is twisted apart. As a result, the ends of the bone may be sharp, jagged, and slanted.


A stress fracture occurs when force is repeatedly applied to a bone during certain activities, such as walking with a heavy pack or running (see Stress Fractures of the Foot). Stress fractures are often small cracks in bone (sometimes called hairline fractures).

Stress fractures commonly occur in bones that bear weight, such as those of the foot or lower leg.


The bone buckles rather than breaks.

These fractures usually occur only in children. Bones in children can buckle rather than break because their bones are more rubbery than those in adults.


The bone is broken straight across.

Some Types of Fractures


  • Treatment of serious complications

  • Pain relief

  • Protection, rest, ice, compression, and elevation

  • Realignment (reduction) of parts that are out of place

  • Immobilization, usually with a splint or cast

  • Sometimes surgery

Many musculoskeletal injuries require immediate treatment. Without treatment, injuries may get worse, becoming more painful and making loss of function more likely. Also, some injuries cause problems that require emergency care, such as shock or compartment syndrome. Without treatment, these problems can cause serious problems or even death.

If people think that they have a fracture or another severe injury, they should go to an emergency department. If they cannot walk or have several injuries, they should go by ambulance. Until they can get medical help, they should do the following:

  • Prevent the injured limb from moving (immobilize it) and support it with a makeshift splint, sling, or a pillow

  • Elevate the limb, above the level of the heart if possible, to limit swelling

  • Apply ice (wrapped in a towel or cloth) to control pain and swelling

Treatment of children

Fractures in children are often treated differently from those in adults because the bones in children are smaller, more flexible, less brittle, and still growing. Children’s fractures heal much faster and more perfectly than adult fractures do. Several years after most fractures in children, the bone can look almost normal on x-ray. For children, doctors often prefer treatment with casts over surgery because

  • Children have less stiffness after wearing a cast than adults do.

  • They are more likely to be able to move normally after being in a cast.

  • Surgery near a joint can damage the part of the bone that enables children to grow (the growth plate).

Treatment of serious injuries

In the emergency department, doctors check for injuries that require immediate treatment. If the skin is torn, the wound is covered with a sterile dressing, and the injured person is given a vaccine to prevent tetanus (see Diphtheria-Tetanus-Pertussis Vaccine) and antibiotics to prevent infection. Also, the wound is cleaned, usually after a local anesthetic is used to numb the area.

To make sure the injured part is not deprived of blood, doctors surgically repair damaged arteries unless the arteries are small and blood flow is not affected.

Severed nerves are also repaired surgically, but this surgery can be delayed until several days after the injury if necessary. If nerves are bruised or damaged, they may heal on their own.

Pain relief

Pain is treated, typically with opioid pain relievers and/or acetaminophen. Aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs—see Nonopioid Analgesics : Nonsteroidal Anti-Inflammatory Drugs) are not usually recommended because they are usually no more effective than acetaminophen and, in some people, may worsen bleeding.


PRICE refers to the combination of protection, rest, ice, compression (pressure), and elevation. This treatment is used to treat injured muscles, ligaments, and tendons.

Protection helps prevent further injury that could worsen the original one. Typically, a splint or other device is applied.

Rest prevents further injury and may speed healing. People should limit their activity and avoid putting weight on and/or using the injured body part. For example, they should use crutches and not participate in contact sports.

Ice and compression minimize swelling and pain. Ice is enclosed in a plastic bag, towel, or cloth and applied for 15 to 20 minutes at a time, as often as possible during the first 24 to 48 hours. Usually, compression is applied to the injury with an elastic bandage.

Elevating the injured limb helps drain fluid away from the injury and thus reduce swelling. The injured limb is elevated above heart level for the first 2 days.

After 48 hours, people can periodically apply heat (for example, with a heating pad) for 15 to 20 minutes at a time. Heat may relieve pain. However, whether heat or ice is best is unclear, and what works best may vary from one person to another.


Often, certain injured parts must be moved back into their normal position (realigned, or reduced). For example, reduction is usually necessary if

  • Pieces of a broken bone have become separated (displaced).

  • Pieces of a broken bone are out of alignment.

  • A joint is dislocated.

Certain fractures in children do not need to be realigned because the bone, which is still growing, can correct itself.

If possible, reduction is done without surgery (called closed reduction), by manipulation—for example, by pulling and/or turning a limb. After reduction is done, doctors usually take x-rays to determine whether the injured parts are in their normal position.

Some injuries must be realigned surgically (called open reduction—see Surgery).

Because reduction is usually painful, people are usually given pain relievers, sedatives, and/or an anesthetic (see Surgery : Anesthesia) before the procedure. The types of drugs that are used depend on how severe the injury is and how reduction is to be done:

  • Closed reduction of minor fractures (such as those of the fingers or toes): A local anesthetic, such as lidocaine, injected near the injured part, may be all that is needed.

  • Closed reduction of major fractures (such as those of the arm, shoulder, or lower leg): People may be given a sedative and pain relievers by vein. The sedative makes them drowsy but not unconscious. They may also be given a local anesthetic by injection. For example, if people have a shoulder dislocation, lidocaine may be injected into the shoulder joint.

  • Open reduction: People are given a general anesthetic by injection or through a face mask, making them unconscious. This procedure is done in an operating room.


After being realigned, the injury must be kept from moving (be immobilized).

Casts, splints, or slings are usually used after closed reduction of a fracture or dislocation.

Hardware devices, such as pins, screws, rods, and plates, are often used during open reduction of a fracture. This procedure is called open reduction and internal fixation (ORIF—see Surgery).

Immobilization reduces pain and helps with healing by preventing further injury to surrounding tissues. If a leg or an arm bone is fractured, immobilization may help prevent fat embolism. Immobilization is helpful for most moderate or severe injuries. Joints on both sides of the injury are immobilized.

If immobilization lasts too long (for example, for more than a few weeks in young adults), the joint may become stiff, sometimes permanently, and muscles may shorten (causing contractures) or shrink (waste away, or atrophy). Blood clots may develop. Such problems can develop quickly, and contractures can become permanent, usually in older people. Consequently, doctors encourage movement as soon as the fracture heals. They also tend to use treatments that enable older people to walk as soon as possible (such as surgical repair of a hip fracture), rather than ones that require them to be immobilized for a long time (such as bed rest or a cast).

Whether immobilization is required and which technique is used depend on the type of injury.

Most fractures are immobilized with a cast, splint, or sling until they heal. Without immobilization, the broken ends are likely to move, healing is slower, and the bones may not grow back together. If the broken bones have been separated (displaced), they must be realigned (reduced) before being immobilized.

If a partial tear in a tendon is suspected or if the diagnosis is uncertain, doctors may apply a splint to immobilize the injured part so that the tendon can heal. Some severe tendon tears are immobilized for days or weeks, sometimes with a cast.

Mild sprains are immobilized briefly if at all. Moving the injured part as soon as possible is usually the best treatment. Moderate sprains are often immobilized with a sling or splint for a few days. Some severe sprains are immobilized for days or weeks, sometimes with a cast. However, some severe sprains must be surgically repaired and are not always immobilized.

Some dislocated joints require only a sling or splint. It is applied after the joint is returned to its normal position. Joints are immobilized to prevent them from moving and possibly causing further injury.

Casts are usually used for injuries that must be kept immobilized for weeks.

To apply a cast, doctors wrap the injured part in cloth, then apply a layer of soft cottony material to protect the skin from pressure and rubbing. Over this padding, doctors wrap dampened plaster-filled cotton bandages or fiberglass strips, which harden when they dry. Plaster is often used to immobilize broken bones that have been separated because it molds well and is less likely to rub against the body. Fiberglass casts are stronger, lighter, and longer-lasting. After a week or so, the swelling goes down. Then, the plaster cast can sometimes be replaced with a fiberglass cast to fit the limb more snugly.

People who require a cast are given special instructions for its care. If a cast is not correctly cared for, problems can develop. For example, if the cast becomes wet, the protective padding under the cast may become wet, and drying it completely may be impossible. As a result, the skin can soften and break down, and sores may form. Also, if a plaster cast gets wet, it can fall apart and thus no longer protect and immobilize the injured area. People are instructed to keep the cast elevated as much as possible at or above heart level, especially for the first 24 to 48 hours. They should also regularly flex and extend their fingers or wiggle their toes. These strategies help blood drain from the injured limb and thus prevent swelling.

Pain, pressure, or numbness that remains constant or worsens over time must be reported to a doctor immediately. These symptoms may be due to a developing pressure sore or compartment syndrome (see Compartment Syndrome.). In such cases, doctors may have to remove the cast and apply another one.

A splint can be used to immobilize some fractures, sprains, and other injuries, particularly if they need to be kept immobile for only a few days or less. Splints allow people to apply ice and to move more than a cast does.

A splint is a long, narrow slab of plaster, fiberglass, or aluminum applied with elastic wrap or tape. Because the slab does not completely encircle the limb, there is room for some expansion due to swelling. Thus, a splint does not increase the risk of developing compartment syndrome. Some injuries that eventually require a cast are first immobilized with a splint until most of the swelling resolves. For finger fractures, aluminum splints lined with foam are commonly used.

A sling by itself can provide sufficient support for many shoulder and elbow fractures. The weight of the arm pulling downward helps keep many shoulder fractures aligned. Slings can be useful when complete immobilization has undesirable effects. For example, if a shoulder is completely immobilized, the tissues around the joint may become stiff, sometimes within days, preventing the shoulder from moving (called frozen shoulder). Slings limit movement of the shoulder and elbow but allow movement of the hand.

A swathe, which is a piece of cloth or a strap, may be used with a sling to prevent the arm from swinging outward, especially at night. The swathe is wrapped around the back and over the injured part.

Bed rest, which is occasionally required for fractures (such as some fractures of the spine or pelvis), can cause problems (see Problems Due to Bed Rest), including blood clots, and a decrease in general physical fitness (deconditioning).

Commonly Used Techniques for Immobilizing a Joint


Sometimes fractures must be reduced and repaired surgically, as for the following:

  • Open fractures: Because the skin was broken, bacteria and debris can enter the body. Doctors must carefully clean the area around the fracture to remove all traces of debris. Doing so reduces the risk of infection.

  • Displaced fractures that cannot be aligned or kept aligned by closed reduction: When a piece of bone has shifted or a tendon is in the way, doctors may not be able to realign the broken bones by manipulating them from the outside (closed reduction). Or the fracture can be realigned using closed reduction, but the muscles pull on the pieces of bone and keep them from staying in place.

  • Joint surface fractures: These fractures extend into a joint, fracturing the cartilage at the ends of the bones in the joint. To prevent people from developing arthritis later, doctors must almost perfectly realign the fractured cartilage. Realignment can be more precise when it is done surgically.

  • Pathologic fractures in a bone weakened by cancer: Bone weakened by cancer may not heal normally after a fracture. Surgery may be needed to prevent the fragments of bone from becoming displaced. Also, stabilizing the joint surgically reduces the pain and enables people to use the joint more quickly than other treatments do.

  • Fractures known to require surgery: Certain kinds of fractures are known to heal more rapidly and have a better outcome when they are surgically repaired.

  • Fractures that would otherwise require a long period of immobilization or bed rest: Surgery shortens the time people have to stay in bed. For example, surgery enables people who have had a hip fracture to get out of bed and begin walking soon after the operation, often as soon as the first day after surgery (with the help of a walker).

  • Complicated fractures: Surgery may be required to treat certain injuries that occur with a fracture, such as damaged arteries or severed nerves.

In open reduction with internal fixation (ORIF), surgery is done to restore the bone’s original shape and alignment. X-rays are used to help surgeons see how to align the bones. After making an incision to expose the fracture, the surgeon uses special instruments to align the bone fragments. Then, the fragments are held in place using some combination of metal wires, pins, screws, rods, and plates. For example, metal plates may be shaped as needed and attached to the outside of the bone with screws. Metal rods may be inserted from one end of the bone into the interior of the bone (marrow). These hardware devices are made of stainless steel, high-strength alloy metal, or titanium. The devices that have been made in the last 15 to 20 years do not interfere with the strong magnets used in MRI. Most do not set off security devices at airports. Some of these devices are permanently left in place, and some are removed after the fracture has healed. Typically, ORIF is used for all fractures that must be repaired surgically (see above).

Joint replacement (arthroplasty) may be needed, usually when fractures severely damage the upper end of the thighbone (femur), which is part of the hip joint, or the upper arm bone (humerus), which is part of the shoulder joint.

In bone grafting, doctors use chips of bone taken from another part of the body (such as the pelvis). This procedure may be done immediately if the gap between pieces of bone is too large. It may be done later if the healing process has slowed (delayed union) or stopped (nonunion).

Arthroscopic surgery is sometimes used (see Surgery Through a Keyhole). For this procedure, a pencil-sized viewing tube is inserted in the joint through a tiny incision. This procedure is done most often to repair ligaments or pads of cartilage (menisci) in the knee (see Knee Sprains and Related Injuries).

Rehabilitation and Prognosis

Most injuries heal well and result in few problems. However, some do not completely heal even though they are diagnosed and treated appropriately.

How long an injury takes to heal varies from weeks to months depending on

  • Type of injury

  • Location of the injury

  • The person's age

  • Other disorders present

For example, children heal much faster than adults, and certain disorders (including those that cause problems with circulation, such as diabetes and peripheral vascular disease), slow healing. Partial tears in ligaments, tendons, and muscles tend to heal spontaneously, but complete tears often require surgery.

People usually feel some discomfort during activities even after injuries have healed enough to allow them to put their full weight on the injured part. For example, after about 2 months, a fractured wrist may be strong enough to use. However, the bone is still being rebuilt (remodeled). Thus, forceful gripping with the wrist may be painful for up to a year. Some people also notice that the injured part is more painful and stiffer when the weather is cold.

Being immobilized makes joints stiff, and muscles weaken and shrink because they are not used. If a limb is immobilized in a cast, the affected joint becomes stiffer each week, and eventually people become unable to fully extend and flex their limb. Such problems can develop quickly and become permanent, usually in older people. After wearing a long leg cast (upper thigh to the toes) for a few weeks, the muscles usually shrink so much that people can insert their hand into the formerly tight space between the cast and their thigh. When the cast is removed, their muscles are very weak and look noticeably smaller.

To prevent or minimize stiffness and to help people maintain muscle strength, doctors may recommend surgery (ORIF) because after surgery, people are able to move the injured part relatively soon. Doctors may also recommend daily exercise, including range-of-motion and muscle-strengthening exercises (see Muscle-strengthening exercises). While the injury is healing, people can exercise the rest of their body.

After the injury has healed sufficiently, the cast can be removed, and people can start exercising the injured limb. When exercising, they should pay attention to how the injured limb feels and avoid exercising too forcefully. If the muscles are too weak for people to exercise them or if such exercise could reseparate a fractured bone, a therapist moves their limbs for them (called passive exercise—see Increasing the Shoulder's Range of Motion). However, ultimately, to regain full strength of an injured limb, people must move their own muscles (called active exercise).

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