Femoral Neck Fracture in Osteoporosis - X-ray Images

1. Annotated AP Pelvis - Femoral Neck Fracture vs. Normal Side

2. Displaced Subcapital Fracture (Textbook X-ray)

3. AP Hip - Displaced Femoral Neck Fracture (Radiopaedia)

• Reduced bone density (osteoporotic pattern - sparse, coarse trabeculae)
• Loss of Shenton's line
• Varus angulation of the femoral head
• Upward displacement of the femoral shaft relative to the head

4. Fracture Classification Diagram - Sites of Proximal Femoral Fractures

• Intracapsular (highest AVN risk): subcapital, transcervical, basicervical
• Extracapsular (lower AVN risk): intertrochanteric, subtrochanteric

5. Garden Classification of Intracapsular Femoral Neck Fractures

Key Radiological Features to Look For in Osteoporosis + Femoral Neck Fracture

1. Reduced bone density - diffusely osteopenic appearance (more "see-through")
2. Fracture line - may be subtle in undisplaced/impacted fractures; look for a sclerotic/lucent line across the neck
3. Loss of Shenton's line - the smooth arc formed by the inferior femoral neck and superior obturator foramen is disrupted
4. Shortening and external rotation - of the affected limb on clinical exam
5. Trabecular disruption - interruption of the normal trabecular pattern is the key clue for subtle/impacted fractures

Note: Approximately 15% of femoral neck fractures are initially difficult to detect on plain X-ray. If clinical suspicion is high but the X-ray appears normal, CT or MRI is indicated to exclude an occult fracture. - Grainger & Allison's Diagnostic Radiology

Surgical Management of Femoral Neck Fracture in Osteoporosis

Decision Algorithm

Femoral Neck Fracture
        │
        ├── Undisplaced (Garden 1 & 2)
        │         └── Internal Fixation (cannulated screws / DHS)
        │
        └── Displaced (Garden 3 & 4)
                  ├── Physiologically OLDER / less active
                  │         └── Hemiarthroplasty (or THA if community ambulatory)
                  └── Physiologically YOUNGER (<60 yrs)
                            └── Internal Fixation (attempt head preservation)

Option 1: Internal Fixation with Cannulated Screws

Technique (Campbell's Operative Orthopaedics, Technique 60.1)

1. Patient supine on fracture table; closed reduction using Whitman technique
2. Fluoroscopic assessment of reduction quality
3. Three partially threaded cannulated screws (6.5, 7.0, or 7.3 mm) inserted in an inverted triangle configuration
4. A fourth screw in a diamond configuration when significant comminution is present
5. Guide pins placed under fluoroscopy in two planes; screws placed with cortical support in the femoral neck

Diagram - Cannulated Screw Fixation

• (A) Side view: screws crossing the fracture line into the femoral head
• (B) Inverted triangle: standard 3-screw configuration (end-on view)
• (C) Diamond: 4-screw configuration for comminuted fractures

Option 2: Dynamic Hip Screw (DHS) / Sliding Hip Screw

Post-op X-rays showing various fixation devices:

• (A) Cannulated screw fixation - parallel screws in femoral neck
• (B) Hemiarthroplasty - prosthetic femoral head replacing the fractured head
• (C) Dynamic hip screw + side plate
• (D) Total hip arthroplasty (THA)

Option 3: Hemiarthroplasty

Hemiarthroplasty vs THA:

Unipolar vs Bipolar:

• Unipolar - single fixed articulation; simpler and cheaper
• Bipolar - inner bearing between head and cup; theoretically reduces acetabular wear, though clinical benefit is debated

Cemented vs Cementless:

• Cemented stems are generally preferred in osteoporotic elderly patients - lower rates of periprosthetic fracture and better initial stability in poor-quality bone

Option 4: Total Hip Arthroplasty (THA)

Garden Alignment Index - Intraoperative Assessment

• AP view: angle between medial trabecular stream and femoral shaft should be 160-170°
• Lateral view: angle should be 180° (collinear)
• Angles outside these ranges indicate inadequate reduction and predict failure

Post-op Implant X-rays (Various Fixation Devices)

Summary Table

Key point in osteoporosis: Bone quality is poor, so internal fixation has a higher failure rate (AVN 15-35%, non-union ~30% in displaced fractures). Arthroplasty is preferred in displaced fractures in elderly osteoporotic patients because it provides immediate stable fixation and allows early full weight-bearing, reducing the risk of prolonged immobility complications (DVT, pressure sores, pneumonia). - Campbell's Operative Orthopaedics, 15th Ed 2026

Recent Research Papers & Guidelines: Femoral Neck Fracture Surgery

🏛️ GUIDELINES & POLICY (2024-2026)

1. WHO Benchmarks for Hip Fracture Care & Osteoporosis Treatment (2026)

Evidence Level: Authoritative WHO-linked Review

1. ≥50% of patients receive surgery within 48 hours of fracture
2. ≥50% of patients receive pharmacological osteoporosis treatment post-fracture

• Fracture Liaison Services (FLS) are evidence-based tools for secondary fracture prevention
• Orthogeriatric co-management models reduce mortality
• Health systems must close data gaps and variability in surgical pathways
• Urgently calls for new national policies tailored to geopolitical contexts

2. Osteosynthesis, Hemiarthroplasty, THA in Hip Fractures: All I Need to Know (2024)

Evidence Level: Practice Guideline / Narrative Review

• National surgical guidelines for hip fractures are established but THA implementation as primary treatment varies widely
• Reviews epidemiology, classification systems, and all three main treatment options
• Emphasizes that THA is increasingly used for active elderly patients but with caveats on dislocation risk
• Supports tailored implant selection based on patient physiology, not age alone

🔩 INTERNAL FIXATION PAPERS (2023-2025)

3. Femoral Neck System (FNS) vs. Cannulated Screws + Medial Plate - Prospective Multicenter RCT (2025)

Evidence Level: Randomized Controlled Trial (165 vs. 166 patients, 2-year follow-up)

4. Optimal Fixation Strategies for Displaced FNF in Patients 18-59 Years - 26-Center Study (2024)

Evidence Level: Large multicenter comparative cohort (565 patients, 26 Level 1 trauma centers)

• Multiple cannulated screws (MCS): 55% failure rate
• Fixed-angle (FA) constructs: 36% failure rate (p<0.001)
• Best construct: Sliding hip screw + medial femoral neck buttress plate (FNBP) + antirotation screw = only 11% failure rate

Clinical implication: Traditional multiple cannulated screw fixation performs poorly for displaced fractures in young patients. Fixed-angle constructs with medial plate augmentation should be prioritized.

5. FNS vs. Cannulated Screws - Meta-Analysis & Systematic Review (2023)

Evidence Level: Review / Meta-Analysis

6. Systematic Review: Post-Op Outcomes of FNF Interventions (2024)

Evidence Level: Systematic Review (PRISMA) - 68,567 patients across 117 studies

• FNS groups had similar or lower complication rates, reoperations, and mortality vs. cannulated screws, cancellous screws, and DHS groups
• No significant safety difference between FNS and traditional devices
• Calls for more prospective controlled studies to firmly establish FNS superiority

🦴 HEMIARTHROPLASTY vs. THA PAPERS (2023-2025)

7. Hemiarthroplasty vs. THA in Elderly - Medicare Data Analysis (2023)

Evidence Level: Large population-based study (61,695 elderly Medicare patients, 2017-2019)

• 83.4% received hemiarthroplasty, 16.6% received THA
• THA carries significantly higher dislocation risk at 12 months
• No difference in revision rates between the two

Clinical implication: THA's higher dislocation risk should be factored into patient selection, especially for less active elderly patients.

8. Conversion THA after Failed Internal Fixation - Systematic Review (2025)

Evidence Level: Systematic Review (1,260 patients, 12 retrospective studies)

Key finding: Conversion THA carries elevated complications regardless of prior fixation method. Surgeons should counsel patients about this before choosing initial fixation strategy.

Summary Table: Best Evidence by Procedure