Far lateral (or zone 3) disc herniation at L4-5 would most likely affect function in which muscle?
33% 33% 22% 11% quadriceps femoris is the correct answer.
Far lateral disc herniation at L4-5 is most likely to affect function of the quadriceps. Far lateral or zone 3 lumbar disc herniation will most often affect the exiting nerve root at the pathologic level. At L4-5 this will be the L4 nerve root.