Shoulder Dislocation (Anterior)

Anterior Shoulder Dislocation

The glenohumeral joint is the most commonly dislocated joint, with up to 96% of shoulder dislocations occurring anteriorly.[1-2] The incidence is 11–29 per 100,000 persons per year, with peak incidence in the late teens and early twenties.[3-4] Below is a comprehensive, clinically organized summary.

1. History

• Mechanism of injury: Forced abduction, external rotation, and hyperextension of the arm (e.g., fall on outstretched hand, tackling, overhead sports)[1][4]
• Timing: When did the injury occur? Was reduction attempted in the field?
• First-time vs. recurrent: Number of prior dislocations/subluxations, prior treatments, prior surgery[5]
• Sensation of "popping out" or "dead arm" feeling
• Ability to move the arm since injury
• Hand dominance, sport/activity level, and timeline for return to activity[5]
• Associated symptoms: numbness over lateral deltoid (axillary nerve), weakness, tingling in hand
• Important negatives: seizure, electrical shock (suggests posterior dislocation), mechanism involving direct posterior force[1]

2. Alarm Features

• Vascular compromise: absent or diminished distal pulses, expanding hematoma, cool/pale extremity
• Axillary nerve injury: loss of sensation over "regimental badge" area (lateral deltoid), deltoid weakness — most commonly injured nerve[6-7]
• Associated fracture: greater tuberosity fracture, bony Bankart, Hill-Sachs deformity[1][7]
• Open dislocation or skin tenting
• Bilateral dislocations (consider seizure, electrocution)
• Inability to reduce in the ED → may indicate interposed tissue, fracture-dislocation, or significant bone loss
• Older patients (>40 years): high suspicion for concomitant rotator cuff tear (most common associated injury in this age group — 14% isolated, up to 28% combined)[7]

3. Medications

Analgesia for reduction

• Intra-articular lidocaine (IAL): 20 mL of 1% lidocaine injected into the glenohumeral joint — as effective as IV sedation with fewer adverse events and shorter ED stays[6][8]
• Procedural sedation: ketamine/propofol (ketofol), midazolam + fentanyl, or propofol alone[9-10]
• Many biomechanical techniques (FARES, external rotation, scapular manipulation) can succeed without any sedation[11-12]

Post-reduction pain management

• Acetaminophen and short-course NSAIDs (no detrimental effect on healing)[5]
• Opioids should be used sparingly, if at all[5]
• Contraindicated: avoid procedural sedation agents in elderly with poor cardiorespiratory reserve, pregnant patients, or polytrauma without appropriate monitoring[2]

4. Diet

• No specific dietary considerations for acute management
• Adequate protein and caloric intake to support tissue healing during rehabilitation
• Ensure hydration, especially if procedural sedation is planned (NPO considerations)

5. Review of Systems

• Neurologic: numbness/tingling in arm or hand, weakness (axillary, musculocutaneous, or brachial plexus injury)
• Vascular: cold/discolored hand, swelling
• MSK: neck pain, ipsilateral arm/elbow pain (concomitant injury)
• Constitutional: seizure history, syncope (mechanism clues)
• Psychiatric/Social: contact sport participation, occupational demands

6. Collateral History and Family History

• Witnesses to mechanism (especially in sports or falls)
• Prior imaging or orthopedic records if recurrent dislocator
• Generalized ligamentous laxity (Beighton score) — familial hypermobility syndromes (Ehlers-Danlos) predispose to recurrent instability[5]
• Family history of connective tissue disorders
• Social context: occupation requiring overhead work, military service, competitive athletics

7. Risk Factors

• Age <20–25 years: strongest risk factor for recurrence — up to 51% recurrence in ages 15–20[3]
• Male sex: 3× more likely to have recurrent instability[3]
• Contact/collision sports (football, rugby, hockey, wrestling)[13]
• Generalized ligamentous laxity[14]
• Glenoid bone loss or Hill-Sachs lesion at index dislocation[15]
• Number of prior dislocations (each additional dislocation increases bone loss and recurrence risk)[15-16]
• Absence of concomitant greater tuberosity fracture (paradoxically protective — reduces recurrence ~4–8×)[3]

8. Differential Diagnosis

• Posterior shoulder dislocation (missed in up to 50% on AP X-ray alone — obtain axillary view; associated with seizures, electrocution)[1]
• Inferior dislocation (luxatio erecta): arm locked in full abduction
• Proximal humerus fracture (especially greater tuberosity or surgical neck)
• Acromioclavicular (AC) joint separation
• Rotator cuff tear (especially in patients >40 years)
• Fracture-dislocation (humeral head fracture with concurrent dislocation)
• Brachial plexus injury (stinger/burner)
• Multidirectional instability (atraumatic, often bilateral)

9. Past Medical History

• Prior shoulder dislocations or subluxations (number, side, treatment)
• Prior shoulder surgery (Bankart repair, Latarjet)
• History of seizures or epilepsy
• Connective tissue disorders (Ehlers-Danlos, Marfan)
• Chronic conditions affecting sedation safety (COPD, OSA, cardiac disease)
• Anticoagulation status (relevant for procedural sedation and potential surgery)

10. Physical Exam

• Inspection: loss of normal deltoid contour ("squared-off" shoulder), arm held in slight abduction and external rotation, prominent acromion
• Palpation: humeral head palpable anteriorly, empty glenoid fossa posteriorly

Neurovascular exam (mandatory pre- and post-reduction)

• Axillary nerve: sensation over lateral deltoid ("regimental badge area"), deltoid contraction
• Distal pulses (radial, ulnar), capillary refill
• Musculocutaneous nerve: lateral forearm sensation, biceps strength
• Post-reduction: repeat neurovascular exam, assess ROM, apprehension testing (defer in acute setting)
• Provocative tests (office follow-up): apprehension/relocation test, load-and-shift, anterior/posterior drawer, sulcus sign[5]

11. Lab Studies

• Routine labs are not required for uncomplicated anterior shoulder dislocation
• If procedural sedation is planned: no routine labs needed for healthy patients; consider glucose in diabetics, coagulation studies if on anticoagulants
• If vascular injury suspected: CBC, type and screen
• Nerve conduction studies if persistent neurologic deficit at follow-up[7]

12. Imaging

• Pre-reduction: radiographs are ideal but should not delay reduction if diagnosis is clinically obvious; POCUS has high diagnostic accuracy comparable to radiography and can expedite care[6]
• Post-reduction (mandatory for first-time dislocations): minimum AP and axillary (or Velpeau) views to confirm reduction and rule out fracture[1][5][17]
• Stryker notch view can evaluate Hill-Sachs lesions[17]
• MRI: not routinely needed after first-time dislocation; consider in recurrent dislocations, patients >40 (rotator cuff tear), or when surgical planning is needed[5][17]
• Noncontrast MRI adequate in acute setting (joint effusion provides natural arthrographic effect)[17]
• CT with 3D reconstruction: indicated when glenoid bone loss is suspected or for surgical planning[5][18]
• When imaging is unnecessary: pre-reduction films can be deferred for clinically obvious recurrent dislocations in known dislocators[5]

13. Special Tests

• POCUS: high sensitivity/specificity for confirming dislocation and detecting associated fractures; useful for confirming reduction in real time[6]
• Apprehension and relocation test: gold standard provocative test for anterior instability (perform at follow-up, not acutely)
• Beighton score: assess generalized ligamentous laxity[5]
• Instability Severity Index Score (ISIS) / WOSI score: validated tools for risk stratification and surgical decision-making in the outpatient setting
• Nerve conduction studies: if axillary or other nerve injury suspected and not resolving[7]

14. ECG

• Not routinely indicated for isolated anterior shoulder dislocation

Obtain ECG if

• Procedural sedation is planned in patients with cardiac history or risk factors
• Mechanism involves electrocution (also evaluate for posterior dislocation and rhabdomyolysis)
• Syncope preceded the fall/injury

15. Assessment

• Anterior shoulder dislocation is a clinical and radiographic diagnosis. The typical presentation — young male with traumatic mechanism, arm held in abduction/external rotation, loss of deltoid contour, and palpable anterior humeral head — is usually straightforward.[1][3]

Severity stratification

• Simple first-time dislocation: closed reduction, sling, orthopedic follow-up
• First-time dislocation in young athlete (<25 years): high recurrence risk; early orthopedic referral for discussion of surgical stabilization[19-20]
• Recurrent dislocation: progressive bone loss with each episode; surgical consultation strongly recommended[15-16]
• Fracture-dislocation: requires urgent orthopedic consultation
• Associated neurovascular injury: emergent management
• Key complications: recurrent instability (most common long-term issue), axillary nerve palsy, rotator cuff tear (especially age >40), Bankart lesion (59–66%), Hill-Sachs lesion (71–85%), chronic pain, and post-traumatic arthritis[3][7][21]

16. Treatment Plan

Initial stabilization and reduction

• Attempt reduction early, before muscular spasm develops[5]
• Preferred analgesia: intra-articular lidocaine (20 mL of 1% lidocaine) — equivalent efficacy to IV sedation, fewer adverse events, shorter ED stay[6][8]
• Reduction techniques (no single method is clearly superior in success rate):[6][11]
• Scapular manipulation: shown to be superior in systematic comparisons[1]
• FARES method: noted for superior pain management[6]
• External rotation: effective without sedation (ERWOSA), especially in males[12]
• Biomechanical techniques (Cunningham, Stimson): least painful, fastest reduction[11]
• Traction-countertraction (Hippocratic): effective but more painful
• Confirm reduction with post-reduction radiographs and repeat neurovascular exam[1][5]

Post-reduction management

• Sling immobilization for 2–4 weeks for comfort[1][5]
• External rotation immobilization may be more effective than internal rotation in preventing redislocation, though evidence is evolving[6]
• Acetaminophen and short-course NSAIDs for pain[5]
• Graduated rehabilitation: passive → active ROM → rotator cuff and periscapular strengthening → sport-specific conditioning[5]

Surgical considerations

• Arthroscopic Bankart repair significantly reduces recurrence, especially in patients <40 years[19-20]
• Early surgical stabilization should be strongly considered in young athletes in contact sports[14][20]
• Indications for surgery: recurrent dislocations, significant glenoid bone loss (>13.5–20%), off-track Hill-Sachs lesions, bony Bankart, young high-risk athletes[13][18]

17. Disposition

• Discharge (majority of cases): successful closed reduction, confirmed on X-ray, intact neurovascular exam, pain controlled, reliable follow-up

Observation/Admission criteria

• Failed reduction requiring procedural sedation with prolonged recovery
• Associated fracture requiring orthopedic management
• Vascular injury
• Significant comorbidities complicating sedation

Specialist consultation triggers

• Orthopedics (urgent): irreducible dislocation, fracture-dislocation, open dislocation, vascular injury
• Orthopedics (outpatient): all first-time dislocations (especially age <25), recurrent dislocators, suspected rotator cuff tear in older patients[1][6]
• Vascular surgery: if vascular compromise suspected

18. Follow-Up / Return Precautions

• Orthopedic follow-up within 1–2 weeks for all first-time dislocations[1][6]
• Athletes may return to play when pain-free with symmetric ROM and sport-specific function — as early as 2–3 weeks for recurrent dislocators, longer for first-time[1][5]
• Return precautions (instruct patient to return immediately for):
• Increasing numbness, tingling, or weakness in the arm/hand
• Loss of pulse, cold/blue fingers
• Worsening pain despite medications
• Feeling of shoulder "slipping out" again

Patient counseling

• Recurrence risk is high in young patients (up to 51% in ages 15–20, 36% in ages 21–40) and decreases significantly after age 40 (~10–11%)[3]
• Each recurrent dislocation causes additional bone and soft tissue damage[15-16]
• Discuss surgical stabilization options at orthopedic follow-up, particularly for young, active patients[19-20]
• Avoid provocative positions (abduction + external rotation) during healing

References

1. Acute Shoulder Injuries in Adults. — Simon LM, Nguyen V, Ezinwa NM. American Family Physician. 2023.

2. Intra-Articular Lignocaine Versus Intravenous Analgesia With or Without Sedation for Manual Reduction of Acute Anterior Shoulder Dislocation in Adults. — Wakai A, O'Sullivan R, McCabe A. The Cochrane Database of Systematic Reviews. 2011.

3. Conservative Management Following Closed Reduction of Traumatic Anterior Dislocation of the Shoulder. — Braun C, McRobert CJ. The Cochrane Database of Systematic Reviews. 2019.

4. Traumatic Anterior Shoulder Dislocation: Epidemiology, Diagnosis, and Treatment. — Goth AP, Klug A, Gosheger G, et al. Deutsches Arzteblatt International. 2025.

5. Initial Assessment and Management of Select Musculoskeletal Injuries: A Team Physician Consensus Statement. — Herring SA, Kibler WB, Putukian M, et al. Medicine and Science in Sports and Exercise. 2024.

6. An Umbrella Review of Systematic Reviews and Meta-Analyses for Assessment and Treatment of Acute Shoulder Dislocation. — Gonai S, Miyoshi T, da Silva Lopes K, Gilmour S. The American Journal of Emergency Medicine. 2025.

7. Prevalence of Associated Injuries After Anterior Shoulder Dislocation: A Prospective Study. — Atef A, El-Tantawy A, Gad H, Hefeda M. International Orthopaedics. 2016.

8. Intra-Articular Lidocaine Versus Intravenous Sedation for Closed Reduction of Acute Anterior Shoulder Dislocation in the Emergency Department: A Systematic Review and Meta-Analysis. — Sithamparapillai A, Grewal K, Thompson C, Walsh C, McLeod S. Cjem. 2022.

9. Comparing Ketofol With Etofen in Procedural Sedation Analgesia for Anterior Shoulder Dislocation Reduction: A Randomized Trial. — Habibi-Khorasani M, Nazemi-Rafi M, Mirafzal A, Movahedi M, Honarmand A. Injury. 2025.

10. Comparing Diazepam Plus Fentanyl With Midazolam Plus Fentanyl in the Moderate Procedural Sedation of Anterior Shoulder Dislocations: A Randomized Clinical Trial. — Afzalimoghaddam M, Khademi MF, Mirfazaelian H, et al. The Journal of Emergency Medicine. 2021.

11. Effects of Reduction Technique for Acute Anterior Shoulder Dislocation Without Sedation or Intra-Articular Pain Management: A Systematic Review and Meta-Analysis. — Baden DN, Visser MFL, Roetman MH, et al. European Journal of Trauma and Emergency Surgery : Official Publication of the European Trauma Society. 2023.

12. Anterior Shoulder Dislocations in Busy Emergency Departments: The External Rotation Without Sedation and Analgesia (ERWOSA) Method May Be the First Choice for Reduction. — Janitzky AA, Akyol C, Kesapli M, et al. Medicine. 2015.

13. Anterior Shoulder Instability Management: Indications, Techniques, and Outcomes. — Arner JW, Peebles LA, Bradley JP, Provencher MT. Arthroscopy : The Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association. 2020.

14. The Adolescent Athlete and the Team Physician: A Consensus Statement. 2025 Update. — Putukian M, Leclere LE, Herring SA, et al. Medicine and Science in Sports and Exercise. 2026.

15. Predictors of Bone Loss in Anterior Glenohumeral Instability. — Hettrich CM, Magnuson JA, Baumgarten KM, et al. The American Journal of Sports Medicine. 2023.

16. Editorial Commentary: Management of First-Time Anterior Shoulder Instability Requires Risk Stratification and Surgery for Many, but Not All. — Sheth U. Arthroscopy : The Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association. 2021.

17. ACR Appropriateness Criteria® Acute Shoulder Pain: 2024 Update. — Laur O, Ha AS, Bartolotta RJ, et al. Journal of the American College of Radiology : JACR. 2025.

18. Diagnosis and Management of Traumatic Anterior Shoulder Instability. — Provencher MT, Midtgaard KS, Owens BD, Tokish JM. The Journal of the American Academy of Orthopaedic Surgeons. 2021.

19. Surgical Treatment Is Superior to Conservative Options in Preventing Recurrence of First-Time Anterior Shoulder Dislocation in Adolescents and Adults Under 40 Years of Age: A Systematic Review and Network Meta-Analysis. — Jin H, Zhang G, Chen S, et al. Arthroscopy : The Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association. 2025.

20. Editorial Commentary: Immediate Surgical Stabilization Following a First-Time Traumatic Anterior Shoulder Dislocation Is Still the Best Evidence-Based Approach. — Lin A. Arthroscopy : The Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association. 2023.

21. Recurrence in Traumatic Anterior Shoulder Dislocations Increases the Prevalence of Hill-Sachs and Bankart Lesions: A Systematic Review and Meta-Analysis. — Rutgers C, Verweij LPE, Priester-Vink S, et al. Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA. 2022.