The Stimson technique has the advantage of not requiring an assistant, but disadvantages include the increased time required, difficulty monitoring a prone patient, and the risk of the patient slipping off an elevated stretcher.
(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 or, less commonly, a fracture-dislocation, with potential for skin penetration or breakdown) is present. If an orthopedic surgeon is unavailable, closed reduction can be attempted, ideally using minimal force; if reduction is unsuccessful, it 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
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 unavailable.
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
Contraindications to Stimson method:
Intoxicated or multi-trauma patient: Prone position (part of Stimson method) impedes care and monitoring of such patients.
Pregnant patient: Prone position causes abdominal discomfort.
Complications are uncommon with the Stimson technique.
5- to 15-pound weights (commercial weights or bags of IV fluids) and materials (eg, stockinette, padded wrist restraint, or commercial device) to hang the weights from the patient’s wrist
A strap, sheet, or other means of restraint to keep the patient from slipping off the stretcher
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
Intra-articular anesthesia is well suited to the Stimson technique, providing excellent analgesia and requiring minimal patient monitoring.
Regional anesthesia may be used (eg, ultrasound-guided interscalene nerve block) but has the disadvantage of limiting post-reduction neurologic examination.
Procedural sedation should be avoided for the Stimson technique because the consequences of respiratory inhibition will be amplified by the patient’s prone position and because safely monitoring the patient and maintaining adequate sedation for the duration of this procedure can be difficult.
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.
Deficits of the axillary nerve are the most frequent nerve 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).
Place the patient prone on the stretcher with the affected arm hanging off the side and tie the patient’s hips to the stretcher with a restraining strap or bed sheet to prevent the patient from falling off the stretcher.
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)
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 — Stimson method
With the patient prone and secured to the bed, hang the weights from the wrist. The weights may be added gradually rather than all at once, if necessary, to minimize the patient's discomfort. After up to 30 minutes, the muscle spasm usually relaxes enough to allow the humeral head to reduce.
If reduction does not occur, manually add some downward traction or apply gentle external rotation to the upper arm.
If reduction does not occur, do scapular manipulation How To Reduce Anterior Shoulder Dislocations Using Scapular Manipulation Scapular manipulation repositions the glenoid fossa rather than the humeral head. It requires less force than many other methods, can sometimes be done without analgesia, and is a popular first... read more with the weights still in place.
Successful reduction is preliminarily confirmed by restoration of a normal round shoulder contour, by 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
Ensure that the patient is secured to the stretcher to prevent falling off the stretcher.
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 ).