AIIMS November 2011 – MCQ 100

What is the level of disc prolapse in a lady with reduced extension, intact sensation & pain in great toe but with no sphincter disturbance ?
A. L3-L4
B. L4-L5
C. L5-S1
D. S1-S2

Correct answer : B. L4-L5

Extension of great toe is by extensor hallucis longus muscle. It is supplied by deep peroneal nerve (L5, S1). L5 nerve root is involved in disc prolapse at L4-L5 level. The patient has pain without sensory loss due to irritation of the nerve. Complete damage results in sensory loss, whereas irritation of nerve results in pain.
Ref: Hutchison’s clinical methods, 22nd p211; Maheshwari 3rd p231

Related Q – AIIMS Nov 04, q2 (AA)