What are the sport-specific biomechanics of the 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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Answer

Forces that act on the femoral head in vivo are appreciable. Standing on one leg generates a force of approximately 2.5 times the body weight across the loaded hip. Running increases femoral head forces to roughly 5 times the body weight, whereas simply performing a supine straight-leg raise generates 1.5 times the body weight across the hip joint. During gait, the maximum pressure occurs in the anterosuperior femoral surface and superior acetabular dome.


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