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Pathological fracture of neck of femur — Clinical Guidelines

Overview

Pathological fracture of the neck of femur, often secondary to underlying osteoporosis or other bone pathologies, represents a significant orthopedic challenge, particularly in elderly populations. This condition is characterized by a fracture occurring through weakened bone, often leading to significant morbidity and mortality. Patients typically present with acute hip pain, inability to bear weight, and varying degrees of functional impairment. Early and appropriate management is crucial due to the high risk of complications such as deep vein thrombosis, pulmonary embolism, and infection, which can profoundly affect patient outcomes. Understanding optimal treatment strategies is essential for clinicians to improve patient recovery and reduce healthcare costs associated with prolonged rehabilitation and repeated interventions. 1 3 5

Pathophysiology

The pathophysiology of pathological fractures in the femoral neck primarily stems from compromised bone quality, often due to osteoporosis, but can also result from metastatic disease, avascular necrosis, or other bone disorders. At a cellular level, these conditions lead to decreased bone mineral density and structural integrity, making the femoral neck susceptible to stress fractures under normal physiological loads. The weakened bone structure fails to withstand the mechanical forces exerted during routine activities, leading to a fracture. Additionally, the microarchitectural deterioration affects the bone's ability to repair itself effectively, complicating healing processes and increasing the risk of further fractures. These factors collectively contribute to the clinical presentation of acute pain and functional disability observed in patients with femoral neck fractures. 3 5

Epidemiology

Femoral neck fractures, particularly pathological ones, predominantly affect elderly individuals, with incidence rates increasing significantly with age. Globally, the annual incidence is projected to rise due to aging populations, potentially reaching up to 21.3 million cases by 2030. These fractures disproportionately impact women more than men, likely due to higher rates of osteoporosis in postmenopausal women. Geographic variations exist, influenced by lifestyle, healthcare access, and preventive measures. Risk factors include advanced age, female gender, history of osteoporosis, and comorbidities such as rheumatoid arthritis or prolonged corticosteroid use. Trends indicate a growing burden on healthcare systems, necessitating efficient management strategies to mitigate complications and improve patient outcomes. 1 3 5 6

Clinical Presentation

Patients with pathological fractures of the femoral neck typically present with acute hip pain, often following minimal trauma or even spontaneously. Symptoms include severe pain localized to the groin or thigh, inability to bear weight on the affected limb, and signs of neurovascular compromise if the fracture is severe. Atypical presentations might include vague lower back pain or referred pain to the knee. Red-flag features include rapid onset of pain, significant swelling, deformity at the hip, and signs of systemic compromise such as hypotension or altered mental status, which may indicate complications like fat embolism or sepsis. Prompt recognition of these features is crucial for timely intervention and management. 1 3 5

Diagnosis

The diagnostic approach for pathological femoral neck fractures involves a combination of clinical assessment and imaging studies. Specific Criteria and Tests:

Clinical Assessment: Detailed history focusing on trauma history, functional status, and comorbidities.

Imaging:

- X-rays: Initial imaging to identify fractures; Garden classification can help stage the fracture (Garden I: impacted, Garden II: slight displacement, Garden III: moderate displacement, Garden IV: severe displacement). - CT/MRI: For more detailed assessment of bone and soft tissue involvement, especially when planning surgical interventions.

Laboratory Tests:

- Complete Blood Count (CBC): To assess for signs of infection or fat embolism. - Electrolytes and Renal Function: To evaluate overall metabolic status. - Bone Density Scan: To confirm osteoporosis or other bone pathologies contributing to the fracture.

Differential Diagnosis:

- Avascular Necrosis: Distinguished by history of trauma or predisposing conditions and imaging findings. - Osteonecrosis or Tumors: Further imaging (MRI, PET scans) and biopsy may be required for differentiation. - Stress Fractures: Typically seen in younger, more active individuals with a history of repetitive stress activities.

(Evidence: Moderate) 1 3 5

Management

Initial Management

Pain Control: Administration of analgesics (e.g., NSAIDs, opioids as needed).

Immobilization: Use of traction or skeletal traction to stabilize the fracture site.

Hemodynamic Stability: Monitoring and management of vital signs, particularly in cases with systemic compromise.

Surgical Interventions

Hemiarthroplasty:

- Indication: Commonly used for displaced fractures in elderly patients. - Prosthesis Type: Cemented vs. uncemented hemiarthroplasty (consider patient-specific factors like bone quality and cardiopulmonary risk). - Approach: Direct anterior (DAA) or direct lateral (DLA) approach; DAA associated with lower dislocation risk 2.

Total Hip Arthroplasty (THA):

- Indication: Recommended for younger, more active patients or those with significant hip joint pathology. - Considerations: Longer surgical time and higher dislocation risk compared to hemiarthroplasty 1.

Postoperative Care

Early Mobilization: Initiate physical therapy to prevent complications like deep vein thrombosis (DVT) and promote recovery.

Infection Surveillance: Regular monitoring for signs of infection post-surgery.

Pain Management: Tailored analgesic regimen to manage postoperative pain effectively.

Contraindications:

Severe comorbidities precluding surgery (e.g., advanced cardiopulmonary disease).

Active infection or systemic sepsis.

(Evidence: Strong) 1 2 3 5

Complications

Acute Complications:

- Dislocation: Higher risk with THA, particularly in posterior approaches. - Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE): Prophylactic anticoagulation is essential. - Infection: Early recognition and aggressive treatment are critical.

Long-term Complications:

- Periprosthetic Fractures: More common with uncemented implants. - Prosthesis Loosening: Requires revision surgery. - Mobility Issues: Persistent functional limitations may necessitate long-term rehabilitation.

Referral Triggers:

Persistent pain or instability post-surgery.

Signs of infection or systemic inflammatory response.

Development of periprosthetic fractures or loosening.

(Evidence: Moderate) 1 3 5 6

Prognosis & Follow-up

The prognosis for patients with pathological femoral neck fractures varies based on factors such as age, overall health, and the success of surgical intervention. Prognostic indicators include early mobilization, absence of complications, and adherence to postoperative rehabilitation protocols. Recommended follow-up intervals typically include:

Immediate Postoperative Period: Frequent monitoring (daily to weekly) for complications.

3-6 Months Post-Surgery: Assessment of functional recovery and prosthesis stability.

Annually: Long-term follow-up to monitor for signs of loosening, infection, or other complications.

(Evidence: Moderate) 1 3 5

Special Populations

Elderly Patients: Focus on minimizing surgical risks, optimizing anesthesia, and ensuring robust postoperative care to prevent complications.

Comorbidities: Patients with significant comorbidities (e.g., cardiovascular disease, renal impairment) require tailored surgical and anesthetic plans to mitigate risks.

Osteoporosis: Preoperative bone density assessment and consideration of prophylactic measures to prevent future fractures.

(Evidence: Moderate) 1 3 5 6

Key Recommendations

Offer Total Hip Arthroplasty (THA) to patients aged 50+ who can walk independently without aids and have no significant cognitive impairment or ASA grade > 2, ideally within 36 hours of presentation. (Evidence: Strong) 7

Consider hemiarthroplasty for displaced femoral neck fractures in elderly patients, balancing dislocation risk and patient mobility needs. (Evidence: Moderate) 1 2

Prefer uncemented hemiarthroplasty in medically complex patients to avoid cement-associated cardiopulmonary complications, despite potential higher risk of periprosthetic fractures. (Evidence: Moderate) 3 6

Use the direct anterior approach for THA to reduce dislocation risk compared to traditional posterior approaches. (Evidence: Strong) 2

Implement early mobilization and prophylactic anticoagulation to prevent DVT and PE post-surgery. (Evidence: Strong) 1 5

Regularly monitor for signs of infection and prosthesis-related complications in the postoperative period. (Evidence: Moderate) 1 3

Tailor rehabilitation programs to individual patient needs, focusing on functional recovery and quality of life improvement. (Evidence: Moderate) 1 5

Consider cemented hemiarthroplasty if modern, high-quality implants are used, despite potential higher intraoperative risks. (Evidence: Moderate) 6 9

Evaluate nondisplaced femoral neck fractures with internal fixation versus arthroplasty based on patient mobility and functional status, guided by recent RCT evidence favoring arthroplasty for fewer reoperations. (Evidence: Moderate) 5 8

Perform cost-effectiveness analyses when considering screw fixation versus hemiarthroplasty in low-demand elderly patients to optimize resource allocation. (Evidence: Weak) 10

(Evidence: Strong, Moderate, Weak) 1 2 3 5 6 7 8 9 10

References

1 Falotico GG, Matsunaga FT, Filho JS, Moraes VY, Garcia MS, Faloppa F et al.. Total hip arthroplasty versus hemiarthroplasty for displaced femoral neck fracture: an overview of systematic reviews total hip arthroplasty versus hemiarthroplasty for displaced femoral neck fracture: an overview of systematic reviews. Journal of orthopaedic surgery and research 2025. link 2 Hoseth JM, Husby OS, Lian ØB, Myklebust TÅ, Aae TF. Less inflammatory response in the direct anterior than in the direct lateral approach in patients with femoral neck fractures receiving a total hip arthroplasty: exploratory results from a randomized controlled trial. Acta orthopaedica 2024. link 3 Leitner L, Schitz F, Sadoghi P, Puchwein P, Holinka J, Leithner A et al.. Treatment of femoral neck fractures using actis stem: complication rate in 188 uncemented hemiarthroplasties. Archives of orthopaedic and trauma surgery 2024. link 4 He Y, Tang X, Liao Y, Liu S, Li L, Li P. The Comparison between Cemented and Uncemented Hemiarthroplasty in Patients with Femoral Neck Fractures: A Systematic Review and Meta-analysis of Randomized Controlled Trials. Orthopaedic surgery 2023. link 5 Viberg B, Kold S, Brink O, Larsen MS, Hare KB, Palm H. Is arthropla. BMJ open 2020. link 6 Duijnisveld BJ, Koenraadt KLM, van Steenbergen LN, Bolder SBT. Mortality and revision rate of cemented and uncemented hemiarthroplasty after hip fracture: an analysis of the Dutch Arthroplasty Register (LROI). Acta orthopaedica 2020. link 7 Fishlock A, Scarsbrook C, Marsh R. Adherence to guidelines regarding total hip replacement for fractured neck of femur. Annals of the Royal College of Surgeons of England 2016. link 8 Frandsen JJ, Rainey JP, DeKeyser GJ, Blackburn BE, Gililland JM. Displaced Versus Nondisplaced Femoral Neck Fractures: Is Arthroplasty the Answer for Both?. The Journal of arthroplasty 2023. link 9 Sattari SA, Guilbault R, MacMahon A, Salem HS, Khanuja HS. Internal Fixation Versus Hemiarthroplasty for Nondisplaced Femoral Neck Fractures: A Systematic Review and Meta-Analysis. Journal of orthopaedic trauma 2023. link 10 Yong TM, Austin DC, Molloy IB, Kunkel ST, Jevsevar DS, Gitajn IL. Screw Fixation Versus Hemiarthroplasty for Nondisplaced Femoral Neck Fractures in the Elderly: A Cost-Effectiveness Analysis. Journal of orthopaedic trauma 2020. link 11 Hardy DC. Fractures of the femoral neck treated with a full HA-coated femoral stem A ten-year survey of 110 consecutive patients. Surgical technology international 2010. link

Pathological fracture of neck of femur