What is the pathogenesis of saphenous nerve entrapment?

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

The saphenous nerve can become entrapped where it pierces the roof of the adductor canal. Inflammation results from a sharp angulation of the nerve at its exit and from the dynamic forces of the muscles in this region, which cause contraction and relaxation of the fibrous tissue that impinges on the nerve.

The nerve can also be injured as a result of an improperly protected knee or leg support during surgery. It may be injured by a neurilemoma, entrapment by femoral vessels, direct trauma, pes anserine bursitis, varicose vein operations, and medial knee arthrotomies and meniscus repairs. [19]


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