(See also Overview of Shoulder Dislocation Reduction Techniques Overview of Shoulder Dislocation Reduction Techniques Many techniques are available to reduce a closed dislocation of the shoulder. No technique is universally successful, so operators should be familiar with several. (See also Overview of Dislocations... read more , Overview of Dislocations Overview of Dislocations A dislocation is complete separation of the 2 bones that form a joint. Subluxation is partial separation. Often, a dislocated joint remains dislocated until reduced (realigned) by a clinician... read more , and Shoulder Dislocations Shoulder Dislocations In shoulder (glenohumeral) dislocations, the humeral head separates from the glenoid fossa; displacement is usually anterior. Shoulder dislocations account for about half of major joint dislocations... read more .)
Anterior dislocation of the shoulder
Reduction should be attempted soon (eg, within 30 minutes) after the diagnosis is made.
Reduction should be attempted immediately if an associated neurovascular deficit or skin tenting (due to a displaced bone fracture, with potential for skin penetration or breakdown) is present. If an orthopedic surgeon is unavailable, closed reduction may be attempted, ideally using minimal force; if unsuccessful, reduction may need to be done in the operating room under general anesthesia.
Open dislocations require surgery, but closed reduction techniques and immobilization should be done as interim treatment if the orthopedic surgeon is unavailable and a neurovascular deficit is present.
Contraindications to simple closed reduction:
Greater tuberosity fracture with > 1 cm displacement
Significant Hill-Sachs deformity (≥ 20% humeral head deformity due to impaction against glenoid rim)
Surgical neck fracture (below the greater and lesser tuberosities)
Bankart fracture (anteroinferior glenoid rim) involving a bone fragment of over 20% and with glenohumeral instability
Proximal humeral fracture of 2 or more parts
These significant associated fractures require orthopedic evaluation and management, because of the risk of the procedure itself increasing displacement and injury severity.
Other reasons to consult with an orthopedic surgeon prior to reduction include
The joint is exposed (ie, an open dislocation)
The patient is a child, in whom a physeal (growth plate) fracture is often present; however, if a neurovascular deficit is present, reduction should be done immediately if the orthopedic surgeon is not available.
The dislocation is older than 7 to 10 days, due to an increased risk of damaging the axillary artery during the reduction, especially in older patients
Complications are uncommon with the FARES technique.
Intra-articular anesthetic:* 20 mL of 1% lidocaine, 20-mL syringe, 2-inch 20-gauge needle, antiseptic solution (eg, chlorhexidine, povidone iodine), gauze pads
Shoulder immobilizer or sling and swathe
* Patients are offered analgesia; however, if the patient wishes, one reduction attempt without analgesia may be done.
Reduction attempts are more likely to succeed if patients are calm and can relax their muscles. Analgesia and sedation help patients relax, as may external distractions such as pleasant conversation or the cyclical arm oscillations of the FARES method.
Procedural sedation and analgesia (PSA) is often needed if substantial pain, anxiety, and muscle spasm impede the procedure.
Regional anesthesia can be used (eg, ultrasound-guided interscalene nerve block) but has the disadvantage of limiting post-reduction neurologic examination.
In most anterior dislocations, the humeral head is trapped outside and against the anterior lip of the glenoid fossa. Reduction techniques must distract the humeral head away from the lip and then return the humeral head into the fossa.
Axillary nerve deficits are the most frequent deficits with anterior shoulder dislocations. They often resolve within several months, sometimes soon after the shoulder reduction.
Axillary artery injury is rare with anterior shoulder dislocations and suggests possible concurrent brachial plexus injury (because the brachial plexus surrounds the artery).
Position the patient supine, with the arm adducted, the elbow extended, and the forearm in neutral position (thumb pointing up).
Step-by-Step Description of Procedure
Do a pre-procedure neurovascular examination of the affected arm, and repeat the examination after each reduction attempt. Generally, testing motor function is more reliable than testing sensation, partly because cutaneous nerve territories may overlap. Assess the following:
Distal pulses, capillary refill, cool extremity (axillary artery)
Light touch sensation of the lateral aspect of the upper arm (axillary nerve), thenar and hypothenar eminences (median and ulnar nerves), and dorsum of the 1st web space (radial nerve)
Shoulder abduction against resistance, while feeling the deltoid muscle for contraction (axillary nerve): However, if this test worsens the patient's pain, omit it until after the shoulder has been reduced.
Thumb-index finger apposition ("OK" gesture) and finger flexion against resistance (median nerve)
Finger abduction against resistance (ulnar nerve)
Wrist and finger extension against resistance (radial nerve)
If a cooperative patient chooses to try reduction without analgesia, only one such attempt should be made. To give intra-articular analgesia:
The needle insertion site is about 2 cm inferior to the lateral edge of the acromion process (into the depression created by the absence of the humeral head).
Swab the area with antiseptic solution, and allow the antiseptic solution to dry for at least 1 minute.
Optional: Place a skin wheal of local anesthetic (≤ 1 mL) at the site.
Insert the intra-articular needle perpendicular to the skin, apply back pressure on the syringe plunger, and advance the needle medially and slightly inferiorly about 2 cm.
If any blood is aspirated from the joint, hold the needle hub motionless, switch to an empty syringe, aspirate all of the blood, and re-attach the anesthetic syringe.
Inject 10 to 20 mL of anesthetic solution (eg, 1% lidocaine).
Wait for analgesia to occur (up to 15 to 20 minutes) before proceeding.
Reduce the shoulder—FARES method
Grasp the wrist of the affected arm and slightly pull the arm to provide gentle axial traction. (The FARES method uses no countertraction.)
Begin smoothly and cyclically (about 2 cycles per second) moving the arm up and down, about 5 cm above and below the horizontal plane. Continue these arm oscillations throughout the procedure.
Gradually abduct the arm.
At 90° of abduction, if the joint has not reduced, add gentle external rotation (turning the palm up) and continue abducting.
Reduction is expected to occur by 120°.
Signs of a successful reduction may include a lengthening of the arm, a perceptible “clunk,” and brief deltoid fasciculation.
Successful reduction is preliminarily confirmed by restoration of a normal round shoulder contour, decreased pain, and by the patient's renewed ability to reach across the chest and place the palm of the hand upon the opposite shoulder.
Immobilize the shoulder with a sling and swathe or with a shoulder immobilizer.
Because the joint can spontaneously dislocate after successful reduction, do not delay immobilizing the joint.
Do a post-procedure neurovascular examination. A neurovascular deficit warrants immediate orthopedic evaluation.
Do post-procedure x-rays to confirm proper reduction and identify any coexisting fractures.
Arrange orthopedic follow-up.
Warnings and Common Errors
Apparent shoulder dislocation in a child is often a fracture involving the growth plate, which tends to fracture before the joint is disrupted.
Tips and Tricks
In patients who return with increased pain within 48 hours after a reduction, hemarthrosis is likely (unless the shoulder has again dislocated). Aspirate the blood from the joint space (see How to Do Arthrocentesis of the Shoulder How To Do Shoulder Arthrocentesis Arthrocentesis of the shoulder is the process of puncturing the glenohumeral joint with a needle to withdraw synovial fluid. The anterior approach, which is described here, is most common and... read more ).
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