What is the pathogenesis of obturator nerve entrapment?

Updated: Oct 15, 2019
  • Author: Minoo Hadjari Hollis, MD; Chief Editor: Thomas M DeBerardino, MD  more...
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Answer

The obturator nerve is rarely injured in isolation. However, injury can occur with pelvic trauma and associated fractures, during delivery as a result of compression of the nerve between the head of the fetus and the bony structures of the pelvis, or as a consequence of compression of the nerve between a tumor and the bony pelvis. Entrapment may also occur in the obturator canal during surgery or in conjunction with a total hip arthroplasty.

Other potential causes include malposition of the lower limb for prolonged periods, entrapment in the adductor magnus in athletes, and abnormal positioning of the lower limb of a newborn during a difficult delivery. Some physicians believe that the anterior branch may be entrapped in the fascia as it passes over the adductor brevis, owing to an inflammatory process. [20]


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