Lower Extremity Nerves EC

Question 1

Obturator nerve (roots, muscles innervated, motor deficit, cause of injury)

Answer 1

L2-L4

Medial thigh muscles
Loss of thigh adduction

Caused by anterior hip dislocation

Question 2

Femoral nerve (roots, muscles innervated, motor deficit, cause of injury)

Answer 2

L2-L4

Anterior thigh muscles
Thigh flexion/Leg extension

Caused by pelvic fracture

Question 3

Common peroneal nerve (roots, muscles innervated, action, cause of injury)

Answer 3

L4-S3

Short head of biceps femoris
Flex knee

Trauma to lateral leg or fibula neck fracture

Question 4

Tibial nerve (roots, muscles innervated, action, cause of injury)

Answer 4

L4-S3

Posterior thigh and leg

Knee trauma causes injury

Question 5

Superior gluteal (roots, action, cause of injury)

Answer 5

L4-S1

Thigh abductors
Results in Trendelenburg sign

Injured during posterior hip dislocations or polio

Question 6

Inferior gluteal (roots, cause of injury)

Answer 6

L5-S2

Injury caused by posterior hip dislocation