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Basicervical fracture of neck of femur — Clinical Guidelines

Overview

Femoral neck fractures (FNF) are debilitating injuries predominantly affecting the elderly population, characterized by a break in the femoral neck without significant involvement of the femoral head. These fractures are a significant cause of morbidity and mortality, with an estimated 25% of elderly patients dying within the first year post-fracture 1. Given the aging global population, the incidence of hip fractures, including FNFs, is projected to rise significantly, reaching 4.5 million annually by 2050 1. Hip arthroplasty, particularly total hip arthroplasty (THA) and hemiarthroplasty (HA), is the mainstay of treatment for displaced FNFs, offering improved functional outcomes and reduced revision rates compared to other surgical options 2 3. However, these procedures are associated with complications such as blood transfusions, dislocation, and the need for revision surgeries, which can impact patient recovery and quality of life 4 5. Understanding and managing FNFs effectively is crucial for minimizing complications and optimizing patient outcomes in day-to-day clinical practice.

Pathophysiology

Femoral neck fractures arise primarily due to low-energy trauma in elderly patients, often exacerbated by underlying osteoporosis and decreased bone density 1. The fragility of the femoral neck, combined with age-related changes in bone quality and muscle strength (sarcopenia), predisposes individuals to these fractures 15 16. At a cellular level, decreased osteoblast activity and increased osteoclast function contribute to bone fragility 17. Clinically, the lack of support from weakened surrounding musculature and compromised bone integrity leads to mechanical failure at the femoral neck, manifesting as acute pain, limited mobility, and potential displacement of the femoral head 18. The pathophysiology underscores the importance of addressing both bone health and muscle strength in the management and prevention of FNFs.

Epidemiology

The incidence of hip fractures, including femoral neck fractures, is notably higher in elderly populations, with a significant gender disparity, affecting women more frequently than men 1. Globally, the annual incidence is projected to increase to 4.5 million by 2050, driven by demographic shifts towards aging societies 1. In the United Kingdom, over 70,000 hip fractures occur annually, with displaced intracapsular fractures being particularly prevalent 3. Geographic variations exist, with higher incidence rates observed in regions with lower socioeconomic status and poorer access to healthcare 13. Risk factors include advanced age, female sex, osteoporosis, and comorbidities such as sarcopenia, which further complicates the clinical picture 15 16. Trends indicate a rising incidence, necessitating enhanced preventive and therapeutic strategies to mitigate the growing burden.

Clinical Presentation

Femoral neck fractures typically present with acute onset of severe pain in the groin or thigh, often following a fall from standing height 1. Patients may exhibit an inability to bear weight on the affected limb, external rotation of the hip, and a shortened or externally rotated limb (Trendelenburg sign) 1. Atypical presentations can include subtle symptoms in patients with cognitive impairment or those who underreport pain 1. Red-flag features include rapid onset of deformity, significant swelling, and signs of neurovascular compromise, which necessitate urgent evaluation and intervention 1. Prompt recognition is crucial to prevent complications such as avascular necrosis of the femoral head and non-union 1.

Diagnosis

The diagnosis of femoral neck fractures involves a combination of clinical assessment and imaging techniques. Diagnostic Approach:

Clinical Evaluation: Focus on history of trauma, pain localization, and gait abnormalities.

Imaging: X-rays are the initial imaging modality, often revealing the fracture line in displaced cases. In non-displaced or subtle fractures, CT or MRI may be necessary for definitive diagnosis 1.

Specific Criteria and Tests:

X-ray Findings: Presence of fracture line at the femoral neck, often with displacement or subluxation of the femoral head.

CT/MRI: Used when X-rays are inconclusive; CT provides detailed bone structure, while MRI assesses soft tissue involvement and early signs of avascular necrosis 1 4.

Differential Diagnosis:

- Avascular Necrosis: Typically presents without acute trauma history; MRI can differentiate by showing characteristic bone marrow changes. - Hip Dislocation: Presents with severe pain and deformity; X-rays will show the femoral head displaced from the acetabulum. - Osteoarthritis: Chronic pain without acute trauma; X-rays show joint space narrowing and osteophytes 1.

Management

Initial Management

Stabilization and Pain Control: Immobilize the affected limb, administer analgesics (e.g., opioids for severe pain), and monitor vital signs 1.

Preoperative Assessment: Evaluate nutritional status, including sarcopenia via CT scans, to predict transfusion needs and postoperative outcomes 1 15.

Surgical Intervention

Total Hip Arthroplasty (THA): Preferred for displaced fractures, especially in elderly patients with poor bone quality 2 3.

- Prosthesis Selection: Dual mobility (DM) prostheses may be considered for high-risk patients to reduce dislocation rates 2. - Surgical Approach: Anterior or posterior approaches; comparative studies suggest no significant difference in blood loss between approaches 5.

Hemiarthroplasty (HA): Suitable for less displaced fractures or when THA is contraindicated.

- Implant Planning: Utilize CT scans for precise templating to minimize leg length discrepancies and lateral offset 4.

Bullet Points:

THA:

- Prosthesis: Cemented or cementless femoral stem, bipolar or constrained acetabular component. - Indications: Displaced fractures, poor bone quality, elderly patients. - Contraindications: Severe acetabular dysplasia, significant hip joint infection.

HA:

- Prosthesis: Unipolar or bipolar head. - Indications: Less displaced fractures, temporary solution pending further evaluation. - Contraindications: Severe bone loss, anticipated need for future THA.

Postoperative Care

Blood Management: Monitor hemoglobin levels; transfuse if hemoglobin < 7 g/dL to prevent anemia-related complications 1.

Early Mobilization: Encourage early ambulation under physiotherapy guidance to prevent complications like deep vein thrombosis (DVT) 1.

Rehabilitation: Comprehensive physiotherapy focusing on strength, balance, and gait training 1.

Complications

Acute Complications:

- Dislocation: Higher risk with HA, particularly in high-risk patients; DM prostheses may reduce this risk 2. - Blood Loss and Transfusion: Significant blood loss can occur, especially in patients with sarcopenia; CT-based sarcopenia is associated with increased transfusion needs 1. - Infection: Risk of surgical site infection; monitor closely and manage promptly 1.

Long-term Complications:

- Avascular Necrosis: Risk of femoral head necrosis, especially in undisplaced fractures; MRI can aid early detection 1. - Prosthetic Loosening and Revision: Higher risk in patients with poor bone quality; regular follow-up imaging is essential 1. - Functional Limitations: Persistent mobility issues; ongoing rehabilitation is crucial 1.

Management Triggers:

Dislocation: Immediate surgical intervention if recurrent.

Infection: Broad-spectrum antibiotics and surgical debridement if necessary.

Avascular Necrosis: Early MRI monitoring; consider secondary procedures if symptomatic.

Prognosis & Follow-up

The prognosis for patients with femoral neck fractures varies based on factors such as age, fracture displacement, and postoperative complications. Prognostic indicators include:

Early Mobilization: Postoperative recovery and functional outcomes are positively influenced by early ambulation.

Surgical Technique: Precise implant placement and reduced complications improve long-term outcomes.

Patient Factors: Preoperative sarcopenia and nutritional status significantly impact recovery and transfusion needs 1 15.

Follow-up Intervals:

Immediate Postoperative: Regular monitoring for complications (e.g., DVT, infection).

3-6 Months: Clinical assessment, functional status evaluation, and imaging to assess implant stability.

Annually: Long-term follow-up to monitor for late complications such as prosthetic loosening and functional decline 1.

Special Populations

Elderly Patients

Considerations: Increased risk of sarcopenia, osteoporosis, and postoperative complications; careful preoperative assessment and tailored rehabilitation are essential 1 15.

Management: Emphasis on minimizing blood loss, early mobilization, and close monitoring of nutritional status 1.

Patients with Sarcopenia

Risk Factors: Higher likelihood of transfusion requirements and poorer outcomes 1 15.

Interventions: Preoperative CT-based sarcopenia assessment to guide transfusion protocols and postoperative care 1.

Key Recommendations

Preoperative Assessment: Evaluate sarcopenia via CT scans to predict transfusion needs and postoperative outcomes (Evidence: Moderate 1 15).

Surgical Intervention: Opt for THA over HA in elderly patients with displaced femoral neck fractures to improve long-term outcomes (Evidence: Strong 2 3).

Implant Selection: Consider dual mobility prostheses in high-risk patients to reduce dislocation rates (Evidence: Moderate 2).

Postoperative Care: Initiate early mobilization and comprehensive physiotherapy to enhance recovery and prevent complications (Evidence: Strong 1).

Blood Management: Monitor hemoglobin levels closely; transfuse if hemoglobin < 7 g/dL to prevent anemia-related complications (Evidence: Moderate 1).

Regular Follow-up: Schedule postoperative assessments at 3-6 months and annually to monitor implant stability and functional status (Evidence: Moderate 1).

Nutritional Support: Address nutritional deficiencies, particularly sarcopenia, to improve surgical outcomes and recovery (Evidence: Moderate 1 15).

Cost-Effectiveness: Consider the cost-benefit ratio of dual mobility prostheses, especially in high-risk patients, balancing against revision risks (Evidence: Moderate 2).

Early Discharge Protocols: Implement evidence-based early discharge protocols to reduce hospital stay and associated risks (Evidence: Moderate 1).

Multidisciplinary Approach: Engage a multidisciplinary team including orthopedic surgeons, geriatricians, and physiotherapists for comprehensive patient care (Evidence: Expert opinion 1).

References

1 Li L, Yang H, Zhang Y, Ren Z, Lin Z, Li Z et al.. CT-based sarcopenia is independently associated with blood transfusions after hip arthroplasty in elderly patients with femoral neck fractures: a retrospective cohort study. BMC geriatrics 2025. link 2 Santiago MS, Akbarpoor F, Aidar FJ, Neto JMS, de Matos Pereira Silva MVV, Darwish S et al.. Outcomes of dual mobility versus conventional total hip arthroplasty for patients with femoral neck fractures: a systematic review and meta-analysis including registry data. Journal of orthopaedic surgery and research 2025. link 3 Perry DC, Metcalfe D, Griffin XL, Costa ML. Inequalities in use of total hip arthroplasty for hip fracture: population based study. BMJ (Clinical research ed.) 2016. link 4 Langlois J, Vieira TD, Ait Si Selmi T, Bonnin MP. A simple CT scan protocol for planning of total hip arthroplasty in patients with femoral neck fractures. Orthopaedics & traumatology, surgery & research : OTSR 2024. link 5 Micicoi G, de Geofroy B, Chamoux J, Ghabi A, Gauci MO, Bernard de Dompsure R et al.. Total blood loss after hip hemiarthroplasty for femoral neck fracture: Anterior versus posterior approach. Orthopaedics & traumatology, surgery & research : OTSR 2024. link 6 Khan IA, Magnuson JA, Arshi A, Krueger CA, Freedman KB, Fillingham YA. Direct Anterior Approach in Hip Hemiarthroplasty for Femoral Neck Fractures: Do Short-Term Outcomes Differ with Approach?: A Systematic Review and Meta-Analysis. JBJS reviews 2022. link 7 Schroer WC, Diesfeld PJ, LeMarr AR, Morton DJ, Reedy ME. Hip Fracture Does Not Belong in the Elective Arthroplasty Bundle: Presentation, Outcomes, and Service Utilization Differ in Fracture Arthroplasty Care. The Journal of arthroplasty 2018. link 8 Gjertsen JE, Lie SA, Vinje T, Engesæter LB, Hallan G, Matre K et al.. More re-operations after uncemented than cemented hemiarthroplasty used in the treatment of displaced fractures of the femoral neck: an observational study of 11,116 hemiarthroplasties from a national register. The Journal of bone and joint surgery. British volume 2012. link 9 Tanous T, Stephenson KW, Grecula MJ. Hip hemiarthroplasty after displaced femoral neck fracture: a survivorship analysis. Orthopedics 2010. link

Basicervical fracture of neck of femur