Lower Limb

Question 1

Obturator nerve (L2-4)

• cause of injury:
• motor deficit:
• sensory deficit:

Answer 1

• cause of injury: anterior hip dislocation
• motor deficit: thigh adduction
• sensory deficit: medial thigh

Question 2

femoral nerve (L2-4)

• cause of injury:
• motor deficit:
• sensory deficit:

Answer 2

• cause of injury: pelvic fracture
• motor deficit: thigh flexion and leg extension
• sensory deficit: anterior thigh and medial leg

Question 3

common peroneal nerve (L4-S2)

• cause of injury:
• motor deficit:
• sensory deficit:

Answer 3

• cause of injury: trauma or compression of lateral aspect of leg or fibula neck fracture
• motor deficit:
  
  • foot eversion and dorsiflexion
  • toe extension
  • foot drop, foot slap, steppage gait
• sensory deficit:
  
  • anterolateral leg and dorsal aspect of foot

Question 4

tibial nerve (L4-S3)

• cause of injury:
• motor deficit:
• sensory deficit:

Answer 4

• cause of injury: knee trauma
• motor deficit:
  
  • foot inversion and plantarflexion
  • toe flexion
• sensory deficit:
  
  • sole of foot

Question 5

superior gluteal (L4-S1)

• cause of injury:
• motor deficit:
• sensory deficit:

Answer 5

• cause of injury: posterior hip dislocation or polio
• motor deficit: thigh abduction (positive Trendelenburg sign - contralateral hip drops when standing on leg ipsilateral to site of lesion)
• sensory deficit: –

Question 6

inferior gluteal nerve (L5-S2)

cause of injury:
motor deficit:
sensory deficit:

Answer 6

• cause of injury: posterior hip dislocation
• motor deficit:
  
  • can’t jump, climb stairs, or rise from seated position
  • can’t push inferiorly (downward)
• sensory deficit: —-

Question 7

mnemonic for leg nerve injuries

Answer 7

PED = Peroneal (aka common fibular) Everts and Dorsiflexes; if injured foot dropPED
TIP = Tibial Inverts and Plantarflexes; if injured, can’t stand on TIPtoes

Question 8

Sciatic nerve (L4-S3)

Answer 8

innervates posterior thigh

splits into common peroneal (aka common fibular) and the tibial nerve