What are risk factors for femoral head avascular necrosis (AVN)?

Updated: Oct 22, 2018
  • Author: John D Kelly, IV, MD; Chief Editor: Craig C Young, MD  more...
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A study by Song et al indicated that in patients aged 50 years or older with valgus-angulated femoral neck fractures, the risk of AVN of the femoral head and fixation failure after screw osteosynthesis is predicted by the severity of the initial deformity. Patients with an initial valgus and posterior tilt of greater than 15° (B1.1.2 fracture) were found to have a 17-fold higher risk of treatment failure than did patients with a tilt in both planes of less than 15° (B1.2.1 fracture). [5]

A study by Maini et al indicated that a complete tear of the obturator externus and/or piriformis muscles is a significant risk factor for femoral head AVN. [6]

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