Damaged by: - Same process as the femoral nerve.
- During labour and occasionally as a consequence of compression by hernia in the obturator canal.
Results in: - Weakness of hip external rotation and adduction.
- The patient may complain of inability to cross the affected leg on the other.
- Sensory loss is confined to the innermost aspect of the thigh.
- The adductor reflex is absent (adductor response to striking the medial epicondyle).
SCIATIC NERVE (L4L5S,S2) The nerve descends between the ischial tuberosity and the greater trochanter of the femur. In the thigh it innervates the hamstring muscles (semitendinosus, semimembranosus and biceps). Damaged by: - Congenital or traumatic hip dislocation.
- Penetrating injuries.
- Accidental damage from 'misplaced' intramuscular injection.
- Entrapment at sciatic notch.
- Systemic causes of mononeuropathy Results in: - Weakness of hamstring muscles with loss of knee flexion.
- Distal foot and leg muscles are also affected.
- Sensory loss involves the outer aspect of the leg.
- The ankle reflex is absent.
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