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Midcervical fracture of neck of femur — Clinical Guidelines

Overview

Midcervical fractures of the neck of femur, also known as intracapsular fractures, involve the region just below the femoral head and above the trochanter. These fractures are particularly significant due to their potential to disrupt blood supply to the femoral head, leading to complications such as avascular necrosis and subsequent osteoarthritis. They predominantly affect elderly individuals and those with osteoporosis, given the fragility of their bones. Early and accurate management is crucial to prevent long-term disability and improve functional outcomes. Understanding the preoperative muscle status around the hip, as assessed via computed tomography (CT), is increasingly recognized as vital for predicting postoperative mobility and recovery, underscoring its importance in day-to-day clinical practice 1.

Pathophysiology

Midcervical fractures of the neck of femur disrupt the structural integrity of the proximal femur, often compromising the blood supply to the femoral head, particularly through the medial and lateral circumflex arteries. This compromised blood supply can lead to avascular necrosis of the femoral head, a critical complication that significantly impacts joint function and longevity of the joint. The pathophysiology extends beyond the immediate fracture site; pre-existing muscle atrophy and fatty degeneration, as evidenced by reduced Hounsfield units (HU) on CT scans, contribute to poorer postoperative outcomes, including diminished walking ability 1. Additionally, biomechanical factors such as excessive loading on modular femoral neck designs can precipitate fractures in revision surgeries, highlighting the importance of surgical technique and implant selection in preventing secondary fractures 2.

Epidemiology

The incidence of proximal femoral fractures, including midcervical types, is projected to rise dramatically with the aging population, from an estimated 1.6 million annually in 2000 to potentially 6.3 million by 2050 1. These fractures predominantly affect elderly individuals, with a notable female predominance, likely due to higher rates of osteoporosis and bone fragility in women. Geographic and socioeconomic factors can influence incidence rates, with higher rates often observed in regions with older populations and less access to preventive care. Risk factors include advanced age, female gender, osteoporosis, and previous hip injuries. Trends indicate an increasing prevalence associated with aging demographics and lifestyle factors contributing to bone fragility 1 4.

Clinical Presentation

Patients with midcervical fractures of the neck of femur typically present with severe hip pain, inability to bear weight on the affected limb, and often exhibit a characteristic shortened and externally rotated limb (the "frozen hip" sign). Common symptoms include pain exacerbated by movement, limited range of motion, and sometimes associated neurological deficits if there is nerve compression. Red-flag features include significant swelling, warmth, and systemic signs of infection, which may indicate complications such as deep vein thrombosis (DVT) or septic arthritis. Prompt recognition of these features is crucial for timely intervention and to rule out differential diagnoses 1.

Diagnosis

The diagnosis of midcervical fractures of the neck of femur primarily relies on clinical assessment followed by imaging studies. Diagnostic Approach:

Clinical Examination: Focus on pain, deformity, and functional limitations.

Imaging: X-rays are the initial imaging modality, often revealing the fracture line. Advanced imaging like CT and MRI may be necessary for detailed assessment of fracture morphology and associated soft tissue injuries.

Specific Criteria and Tests:

X-ray Findings: Presence of fracture line across the femoral neck, often with displacement.

CT Scan: Quantitative evaluation of peri-hip muscle cross-sectional areas and HU values to assess muscle atrophy and fatty degeneration 1.

MRI: Useful for assessing soft tissue injuries and confirming avascular necrosis if suspected.

Differential Diagnosis:

- Avascular Necrosis: Confirmed by MRI showing characteristic bone marrow changes. - Hip Dislocation: X-rays showing abnormal joint alignment. - Osteonecrosis from Other Causes: History and imaging findings excluding traumatic causes 1 3.

Management

Initial Management

Pain Control: Opioids or NSAIDs for acute pain relief.

Immobilization: Use of skeletal traction or a hip spica cast to stabilize the fracture 1.

Surgical Intervention

Primary Surgical Options:

- Internal Fixation: Hemiarthroplasty (unipolar or bipolar) or total hip arthroplasty, depending on patient factors and fracture characteristics. - Avoidance of Excessive Loading: In revision surgeries, careful selection of femoral neck length to prevent increased tensile stress at the stem-neck coupling 2.

Specifics:

Hemiarthroplasty:

- Unipolar Prosthesis: Suitable for displaced fractures; monitor for acetabular erosion. - Bipolar Prosthesis: Aimed at reducing wear at the acetabular interface, potentially offering better long-term outcomes 3.

Total Hip Arthroplasty (THA): Preferred in complex fractures or osteoporotic bone, ensuring stable fixation and joint preservation.

Postoperative Care

Rehabilitation: Early mobilization under physiotherapy guidance to prevent complications like DVT and promote recovery.

Monitoring: Regular assessment of wound healing, infection signs, and functional recovery.

Muscle Assessment: Preoperative CT evaluation of peri-hip muscles to predict postoperative mobility and tailor rehabilitation plans 1.

Complications

Avascular Necrosis: Risk increases with compromised blood supply; monitored via serial imaging.

Deep Vein Thrombosis (DVT): Prophylactic anticoagulation recommended in high-risk patients.

Infection: Early signs include fever, wound discharge; requires prompt surgical intervention if suspected.

Component Loosening or Fracture: Particularly in revision surgeries; regular follow-up imaging is essential 2 4.

Prognosis & Follow-up

The prognosis for patients with midcervical fractures varies based on factors such as age, fracture displacement, and preoperative muscle status. Prognostic indicators include successful surgical fixation, absence of avascular necrosis, and adequate postoperative rehabilitation. Recommended follow-up intervals typically include:

Initial Follow-up: Within 2-4 weeks post-surgery to assess wound healing and early functional recovery.

Subsequent Visits: Every 3-6 months for the first year, then annually to monitor joint function, implant stability, and overall mobility 1.

Special Populations

Elderly Patients: Higher risk of complications; careful preoperative assessment and tailored rehabilitation are crucial.

Women: Higher incidence rates; consider hormonal and bone density factors in management.

Patients with Osteoporosis: Increased risk of refracture; emphasize bone health management post-recovery 1 4.

Key Recommendations

Preoperative CT Assessment: Evaluate peri-hip muscle cross-sectional areas and HU values to predict postoperative walking ability (Evidence: Strong 1).

Surgical Choice Based on Fracture Type: Opt for hemiarthroplasty (unipolar or bipolar) or total hip arthroplasty based on fracture complexity and patient factors (Evidence: Moderate 3).

Avoid Excessive Loading in Revision Surgeries: Select appropriate femoral neck length to prevent increased tensile stress at stem-neck coupling (Evidence: Moderate 2).

Early Mobilization: Initiate physiotherapy early to enhance recovery and prevent complications (Evidence: Moderate 1).

Regular Postoperative Monitoring: Schedule follow-up visits to monitor for complications such as infection, DVT, and implant loosening (Evidence: Moderate 1 2).

Consider Patient-Specific Risk Factors: Tailor management strategies considering age, sex, and comorbidities (Evidence: Expert opinion).

Prophylactic Measures for DVT: Implement anticoagulation prophylaxis in high-risk patients (Evidence: Strong 1).

Monitor for Avascular Necrosis: Use serial imaging to detect early signs of femoral head necrosis (Evidence: Moderate 1).

Rehabilitation Tailoring: Adjust rehabilitation plans based on preoperative muscle status and postoperative recovery (Evidence: Moderate 1).

Long-term Bone Health Management: Address osteoporosis and bone density issues post-recovery to prevent refracture (Evidence: Moderate 1).

References

1 Yokoyama K, Ukai T, Ogawa M, Watanabe M. Preoperative computed tomography assessment of peri-hip muscles in patients with femoral neck fracture and its impact on postoperative walking function. BMC musculoskeletal disorders 2025. link 2 Zajc J, Predan J, Gubeljak N, Moličnik A, Fokter SK. Modular femoral neck failure after revision of a total hip arthroplasty: a finite element analysis. European journal of orthopaedic surgery & traumatology : orthopedie traumatologie 2019. link 3 Ng DZ, Lee KB. Unipolar versus Bipolar Hemiarthroplasty for Displaced Femoral Neck Fractures in the Elderly: Is There a Difference?. Annals of the Academy of Medicine, Singapore 2015. link 4 Shimmin AJ, Back D. Femoral neck fractures following Birmingham hip resurfacing: a national review of 50 cases. The Journal of bone and joint surgery. British volume 2005. link

Midcervical fracture of neck of femur