Lower extremity nerves

Question 1

Obturator (L2-4)

Answer 1

Injury: anterior hip dislocation
Motor: thigh adduction
Sensory: medial thigh

Question 2

Femoral (L2-4)

Answer 2

Injury: pelvic fracture
Motor: thign flexion and leg extension
Sensory: anterior tight and medial leg

Question 3

Common peroneal

Answer 3

Injury: fibula neck
Motor: foot eversion, dorsiflexion, toe extension
“foot drop, foot slap, steppage gait”

Sensory:anterolateral leg and dorsal foot

Question 4

Tibial (T4-S3)

Answer 4

Injury: knee
Motor: foot inversion and plantar flexion, toe flexion
Sensory: sole of foot

Question 5

Superior gluteal (L4-S1)

Answer 5

Injury: posterior hip dislocation or polio
Motor: thign abduction (trendelenberg) contralateral hip drop when standing on leg ipsilateral to site of lesion

Sensory:

Question 6

Inferior gluteal (L5-S2)

Answer 6

Posterior hip displocation

Can’t jump, climb stairs or rise from seated position;
can’t push inferiorly (downward)

Question 7

Peroneal mneumonic

Answer 7

PED:
Peroneal everts and drosiflex:
If injured, foot dropPED

Question 8

Tibial mneumonic

Answer 8

TIP
Tibial inverts and plantar flexes:
if injuried, cannot TIPtoe

Question 9

Sciatic nerve (L4-S3)

Answer 9

posterior thigh,

splits into common peroneal and tibial nerve