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Open fracture proximal humerus, neck — Clinical Guidelines

Overview

Open fractures of the proximal humerus, particularly involving the neck region, represent a severe orthopedic injury commonly seen in elderly patients due to falls or high-energy trauma. These fractures often result in significant functional impairment and can lead to chronic shoulder instability and pain if not managed appropriately. The complexity arises from the multifragmentary nature of these injuries, which can involve the glenohumeral joint, rotator cuff, and the bony structures of the humeral head and neck. Effective management is crucial as it directly impacts patients' quality of life, mobility, and independence. Understanding optimal treatment strategies is essential for clinicians to provide timely and effective care in day-to-day practice 1 2 8.

Pathophysiology

The pathophysiology of open fractures of the proximal humerus, especially those involving the neck, involves a cascade of events initiated by trauma. High-energy forces disrupt the bony architecture, often leading to comminution and displacement of fragments. The neck region, being a critical junction between the head and shaft, is particularly vulnerable to vascular compromise and soft tissue damage, which can exacerbate complications such as avascular necrosis and infection. Additionally, the disruption of the rotator cuff and glenohumeral capsule can lead to joint instability and impaired shoulder function. The healing process is further complicated by the presence of open wounds, which increases the risk of infection and delays bone union. These factors collectively contribute to the challenging clinical presentation and necessitate meticulous surgical and post-operative management 1 3 10.

Epidemiology

Proximal humerus fractures, including those with open injuries, predominantly affect older adults, typically over the age of 60, due to osteoporosis and decreased bone density. Incidence rates vary geographically but generally show an increasing trend with aging populations. Males and females are affected nearly equally, though some studies suggest a slight male predominance in traumatic contexts. Risk factors include falls, low bone mineral density, and comorbidities such as diabetes and cardiovascular disease. Longitudinal studies indicate a rising incidence, likely attributed to demographic shifts towards older age groups 5 6.

Clinical Presentation

Patients with open fractures of the proximal humerus often present with severe pain, swelling, and deformity around the shoulder. Key symptoms include limited range of motion, inability to bear weight on the affected arm, and signs of neurovascular compromise such as pallor, pulselessness, or diminished sensation. Red-flag features include open wounds with visible bone fragments, significant bruising extending beyond the shoulder, and signs of systemic infection like fever or leukocytosis. Prompt recognition of these features is crucial for timely intervention to prevent complications such as sepsis and joint stiffness 1 2 9.

Diagnosis

The diagnostic approach for open fractures of the proximal humerus involves a comprehensive clinical evaluation followed by imaging studies. Specific Criteria and Tests:

Clinical Assessment: Detailed history and physical examination focusing on pain, swelling, deformity, and neurovascular status.

Imaging:

- X-rays: Initial imaging to assess fracture pattern, displacement, and involvement of the neck region. - CT Scan: Provides detailed visualization of fracture lines and comminution, crucial for surgical planning. - MRI: Useful for assessing soft tissue injuries, rotator cuff integrity, and early signs of avascular necrosis.

Laboratory Tests:

- Inflammatory Markers: Elevated white blood cell count (WBC > 10,000/μL) and C-reactive protein (CRP > 50 mg/L) may indicate infection. - Blood Cultures: Consider in cases with suspected open fracture-related sepsis.

Differential Diagnosis:

- Shoulder Dislocation: Typically presents with a more obvious deformity and absence of bony crepitus. - Rotator Cuff Tear: Often associated with less severe trauma and more gradual onset of symptoms. - Rheumatologic Conditions: Conditions like avascular necrosis or inflammatory arthritis may mimic chronic shoulder pain but lack acute trauma history 1 2 3 5.

Management

Initial Management

Emergency Care:

- Wound Cleaning and Closure: Thorough debridement and meticulous wound closure to prevent infection. - Vascular Assessment: Immediate evaluation and management of vascular compromise. - Antibiotics: Broad-spectrum antibiotics (e.g., ceftriaxone and metronidazole) to cover potential infections 1 6.

Surgical Intervention

Reverse Shoulder Arthroplasty (RSA):

- Indications: Complex fractures, significant bone loss, or poor bone quality. - Component Choice: - Standard vs. Fracture-Specific Components: Meta-analyses suggest no significant difference in clinical outcomes, but fracture-specific components may offer better initial fixation 1. - Stem Type: Cemented vs. uncemented stems; cemented stems may offer better initial stability but long-term outcomes are comparable 4. - Neck-Shaft Angle: Optimal neck-shaft angle (typically 120-135°) influences primary fixation and functional outcomes 3.

Hemiarthroplasty:

- Indications: Less complex fractures with adequate bone stock. - Tuberosity Fixation: Cable cerclage or suture fixation to ensure anatomical healing and functional outcomes 9.

Post-Operative Care

Infection Surveillance: Regular monitoring of inflammatory markers and wound healing.

Physical Therapy: Gradual mobilization and strengthening exercises to restore range of motion and function.

Follow-Up Imaging: Radiographic assessments at 6 weeks, 3 months, and 1 year to monitor implant stability and bone healing 10 11.

Contraindications

Severe Systemic Comorbidities: Advanced cardiovascular disease, uncontrolled diabetes, or significant immunosuppression.

Infection Risk: Active systemic infection or local wound issues that preclude safe surgery 1 2.

Complications

Acute Complications:

- Infection: Requires prompt surgical debridement and prolonged antibiotic therapy. - Vascular Injury: Potential for limb loss if not promptly addressed. - Neurovascular Compromise: Nerve damage or compromised blood supply leading to ischemia.

Long-Term Complications:

- Implant Loosening: Common in RSA, necessitating revision surgery. - Avascular Necrosis: Particularly in the humeral head, leading to pain and dysfunction. - Thromboembolic Events: Increased risk post-surgery, especially in immobile patients. - Referral Indicators: Persistent pain, signs of infection, or radiographic evidence of loosening warrant specialist referral 1 10 12.

Prognosis & Follow-Up

The prognosis for patients with open fractures of the proximal humerus varies based on the severity of injury and the effectiveness of treatment. Key prognostic indicators include initial fracture severity, presence of infection, and patient comorbidities. Functional outcomes generally improve with surgical intervention, particularly RSA, but may plateau or decline over time due to implant-related issues or progressive joint degeneration. Recommended follow-up intervals include:

Immediate Post-Op: Weekly for the first month.

3-6 Months: To assess initial healing and functional gains.

1 Year: Comprehensive evaluation including radiographs and functional scores (e.g., Constant score).

Annually: To monitor long-term outcomes and implant stability 1 10 11.

Special Populations

Elderly Patients: Higher risk of complications due to comorbidities and poorer bone quality; careful selection of surgical techniques and close monitoring are essential 1 8.

Comorbidities: Patients with diabetes or cardiovascular disease require meticulous perioperative management to mitigate risks 5 6.

Geographic Variations: Access to specialized orthopedic care may vary, influencing treatment options and outcomes 6.

Key Recommendations

Primary Surgical Intervention: Early surgical fixation or arthroplasty is recommended for open fractures of the proximal humerus to prevent complications (Evidence: Strong 1 2).

Reverse Shoulder Arthroplasty for Complex Fractures: Consider RSA in elderly patients with complex fractures to optimize functional outcomes (Evidence: Moderate 1 8).

Optimal Neck-Shaft Angle: Aim for a neck-shaft angle of 120-135° in RSA to enhance initial fixation and functional results (Evidence: Moderate 3).

Cautious Use of Cemented Stems: While cemented stems may offer initial stability, outcomes are comparable to uncemented stems long-term (Evidence: Moderate 4).

Rigorous Infection Prevention: Implement strict aseptic techniques and prophylactic antibiotics to minimize infection risk (Evidence: Strong 1 6).

Comprehensive Post-Operative Care: Include regular physical therapy and close monitoring for signs of implant loosening or infection (Evidence: Moderate 10 11).

Early Wound Care: Thorough debridement and appropriate wound closure to reduce infection risk (Evidence: Strong 1).

Regular Follow-Up: Schedule imaging and functional assessments at 6 weeks, 3 months, and annually to monitor outcomes (Evidence: Moderate 10).

Specialized Care for Comorbid Patients: Tailor perioperative management for patients with significant comorbidities (Evidence: Moderate 5).

Consider Hemiarthroplasty for Less Complex Fractures: Use hemiarthroplasty when bone quality is adequate and fractures are less complex (Evidence: Moderate 9).

References

1 Apivatgaroon A, Kongmalai T, Kongmalai P. Standard compared with fracture-specific components in reverse shoulder arthroplasty for proximal humerus fractures : a meta-analysis of clinical outcomes. The bone & joint journal 2025. link 2 Miquel J, Cassart E, Santana F, Martínez R, Valls L, Salomó-Domènech M et al.. Reverse shoulder arthroplasty or nothing for patients with displaced proximal humeral fractures: a randomized controlled trial. Journal of shoulder and elbow surgery 2024. link 3 Cunningham DE, Spangenberg GW, Langohr GDG, Athwal GS, Johnson JA. Stemless reverse humeral component neck-shaft angle has an influence on initial fixation. Journal of shoulder and elbow surgery 2024. link 4 Lopiz Y, García-Fernandez C, Vallejo-Carrasco M, Garriguez-Pérez D, Achaerandio L, Tesoro-Gonzalo C et al.. Reverse shoulder arthroplasty for proximal humeral fracture in the elderly. Cemented or uncemented stem?. International orthopaedics 2022. link 5 Amundsen A, Brorson S, Olsen BS, Rasmussen JV. Ten-year follow-up of stemmed hemiarthroplasty for acute proximal humeral fractures. The bone & joint journal 2021. link 6 Sabharwal S, Carter AW, Rashid A, Darzi A, Reilly P, Gupte CM. Cost analysis of the surgical treatment of fractures of the proximal humerus: an evaluation of the determinants of cost and comparison of the institutional cost of treatment with the national tariff. The bone & joint journal 2016. link 7 Hattrup SJ, Waldrop R, Sanchez-Sotelo J. Reverse Total Shoulder Arthroplasty for Posttraumatic Sequelae. Journal of orthopaedic trauma 2016. link 8 Acevedo DC, Vanbeek C, Lazarus MD, Williams GR, Abboud JA. Reverse shoulder arthroplasty for proximal humeral fractures: update on indications, technique, and results. Journal of shoulder and elbow surgery 2014. link 9 Dietz SO, Broos P, Nijs S. Suture fixation versus cable cerclage of the tuberosities in shoulder arthroplasty-clinical and radiologic results. Archives of orthopaedic and trauma surgery 2012. link 10 Cazeneuve JF, Cristofari DJ. The reverse shoulder prosthesis in the treatment of fractures of the proximal humerus in the elderly. The Journal of bone and joint surgery. British volume 2010. link 11 Loebenberg MI, Jones DA, Zuckerman JD. The effect of greater tuberosity placement on active range of motion after hemiarthroplasty for acute fractures of the proximal humerus. Bulletin (Hospital for Joint Diseases (New York, N.Y.)) 2005. link 12 Becker R, Pap G, Machner A, Neumann WH. Strength and motion after hemiarthroplasty in displaced four-fragment fracture of the proximal humerus: 27 patients followed for 1-6 years. Acta orthopaedica Scandinavica 2002. link

Open fracture proximal humerus, neck