A 72-year-old woman from rural Maharashtra presents to the emergency department after a fall at home while walking to the kitchen. She complains of severe pain in the right hip and is unable to bear weight on the right lower limb. On examination, the right leg is held in flexion, adduction, and internal rotation. Hip movements are severely restricted and painful. X-ray pelvis shows a fracture of the femoral neck with the fracture line extending across the entire neck, and the proximal fragment is displaced superiorly and medially relative to the distal fragment. The fracture is classified as Garden Grade IV. What is the most appropriate initial management for this patient?

Explanation

## Neck of Femur Fracture: Garden Grade IV Management ### Classification Context Garden classification is based on the degree of displacement and disruption of trabeculae: - **Grade I–II:** Incomplete or complete but non-displaced fractures - **Grade III–IV:** Displaced fractures with progressive disruption of trabecular continuity Garden Grade IV represents **complete displacement** with the proximal fragment rotated 180° relative to the distal fragment — the worst prognostic category. ### Why Total Hip Arthroplasty is Correct **Key Point:** In elderly patients (typically >65 years) with displaced femoral neck fractures (Garden Grade III–IV), **total hip arthroplasty (THA) is the gold standard** because: 1. **High non-union and avascular necrosis (AVN) rates** — Displaced intracapsular fractures have a 10–30% non-union rate and 15–30% AVN rate even with optimal fixation [cite:Campbell's Operative Orthopaedics Ch 57] 2. **Compromised blood supply** — The femoral neck has a precarious retrograde blood supply; displacement disrupts the remaining vessels 3. **Functional restoration** — THA provides immediate pain relief and early mobilization, reducing complications of immobility (DVT, pneumonia, decubitus ulcers) 4. **Age-related factors** — At 72 years, the patient has sufficient life expectancy to justify prosthetic replacement (typically recommended for patients >65–70 years) ### Management Algorithm for Displaced Femoral Neck Fractures ```mermaid flowchart TD A["Femoral Neck Fracture<br/>(Intracapsular)"]:::outcome --> B{"Displaced?<br/>(Garden III-IV)"}:::decision B -->|"No<br/>(Garden I-II)"| C["ORIF with<br/>cannulated screws"]:::action B -->|"Yes<br/>(Garden III-IV)"| D{"Age & Functional<br/>Status?"}:::decision D -->|"Young<br/>< 60 years"| E["Attempt ORIF<br/>+ close follow-up"]:::action D -->|"Elderly<br/>> 65 years"| F["THA or<br/>Hemiarthroplasty"]:::action D -->|"Very elderly/<br/>poor function"| G["Hemiarthroplasty"]:::action E --> H{"Union achieved?"}:::decision H -->|"Yes"| I["Good outcome"]:::outcome H -->|"No/AVN"| J["Conversion to THA"]:::action ``` ### High-Yield Comparison: ORIF vs. Arthroplasty in Displaced Femoral Neck Fractures | Feature | ORIF (Cannulated Screws) | THA | Hemiarthroplasty | |---------|--------------------------|-----|------------------| | **Indications** | Young patients, non-displaced or minimally displaced | Elderly (>65–70 yrs), displaced, good functional status | Very elderly, poor functional status, medical comorbidities | | **Non-union rate** | 10–30% (higher in displaced) | 0% | 0% | | **AVN rate** | 15–30% (higher in displaced) | 0% | 0% | | **Early mobilization** | Delayed (6–12 weeks) | Immediate | Immediate | | **Revision surgery risk** | High if complications | Low (durable) | Moderate (acetabular wear) | | **Functional outcome** | Good if union achieved | Excellent | Good | **Clinical Pearl:** The Garden Grade IV fracture in this 72-year-old woman carries a very high risk of non-union and AVN if treated with ORIF alone. THA offers the best functional outcome and lowest complication rate in this age group. ### Why This Patient Needs THA (Not ORIF) **High-Yield:** The combination of: - **Complete displacement (Garden IV)** — highest non-union/AVN risk - **Age 72 years** — sufficient life expectancy for prosthetic (typically >10 years) - **Good functional status** — able to ambulate before injury, likely to tolerate and benefit from THA ...makes THA the evidence-based choice. ### Surgical Approach - **Anterolateral or posterolateral approach** to the hip - **Cemented or uncemented prosthesis** depending on bone quality and surgeon preference - **Early weight-bearing** and mobilization post-operatively **Mnemonic: DISPLACED FEMORAL NECK IN ELDERLY = THA** - **D**isplaced (Garden III–IV) - **I**ntracapsular (high AVN/non-union risk) - **S**enior (>65–70 years) - **P**laced → **T**otal **H**ip **A**rthroplasty