Which nerve is frequently injured due to prolonged lithotomy positioning?

Prolonged lithotomy positioning can lead to nerve injuries, with several key nerves being particularly vulnerable in this position. In lithotomy, the legs are raised and placed in stirrups, which can compress and stretch the nerves in the pelvis and lower limb.

The obturator nerve is at risk due to its proximity to the pelvic brim, and compression while the legs are positioned can lead to dysfunction in the inner thigh and adductor muscles. Similarly, the femoral nerve, which runs in the hip area, is susceptible to pressure and can affect the quadriceps and sensation in the anterior thigh.

The common peroneal nerve is also prone to injury when the legs are positioned in lithotomy. It winds around the fibula, and if external pressure is applied or if the leg is in an awkward position, it can cause paresis or sensory deficits in the lower leg and foot.

Since all these nerves can be adversely affected by prolonged lithotomy positioning due to compression and stretching, the answer encapsulating this risk is accurate. Thus, the correct response reflects the real potential for multiple nerve injuries in this context.