Femoral Neck Fractures
Femoral Neck Fractures Carol Lin, MD & Brad Merk, MD Original Authors: Brian Boyer, MD; March 2004 Steven A. Olson, MD; March 2006 James C. Krieg, MD; May 2011 Revised: March 2016 Epidemiology • > 300,000 Hip fractures annually in the US – Accounts for 30% of all hospitalizations – Expected to surpass 6 million annually worldwide by 2050 • Significant morbidity, mortality, expense – $10-15 billion/year in the US www.ahrq.gov/data/hcup; Kannus et al, Bone 1996; Dy et al, JBJS 2011 Epidemiology: Bimodal Distribution • Elderly – incidence doubles each decade beyond age 50 – higher in caucasians – smokers, lower BMI, excessive caffeine & ETOH • Young – high energy trauma Anatomy • Physeal closure age 16 • Neck-shaft angle 130° ± 7° • Anteversion 10° ± 7° • Calcar Femorale Posteromedial calcar dense plate of bone Images from: Court-Brown, C. et al. Rockwood & Greens Fractures in Adults. Philadelphia: Lippincott Williams & Wilkins, 2014 Blood Supply • Lateral epiphysel artery – terminal branch MFC artery – predominant blood supply to weight bearing dome of head • After fracture, blood supply depends on retinacular vessels Images from: Court-Brown, C. et al. Rockwood & Greens Fractures in Adults. Philadelphia: Lippincott Williams & Wilkins, 2014 Blood Supply • Greater fracture displacement = greater risk of retinacular vessel disruption • Tamponade effect of blood in intact capsule – Theoretical risk of AVN with increased pressure Diagnosis • Plain Film – Consider traction-internal rotation view if comminuted • CT scan – Displacement – comminution
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