Lower Limb Nerve Lesions

Question 1

what can cause a lesion to L4?

Answer 1

osteoarthritis

Question 2

what is the location of the L4 dermatome? what muscles are affected?

Answer 2

medial leg

quadriceps, iliopsoas, hip adductors

Question 3

what reflex is suppressed with a lesion to L4?

Answer 3

patellar tendon

Question 4

what can cause a lesion to L5?

Answer 4

herniation of disk between L4 an L5

Question 5

what is the location of the L5 dermatome? what muscles are affected?

Answer 5

dorsum of the foot, great toe, toes 2-3

foot dorsiflexors, toe extensors

Question 6

what can cause a lesion to S1?

Answer 6

herniation of the disk between L5 and S1

Question 7

what is the location of the S1 dermatome? what muscles are affected?

Answer 7

posterior leg, lateral foot, toes 4, 5, and sole

plantar flexors

Question 8

what reflex is suppressed with lesion to S1?

Answer 8

achilles tendon

Question 9

a pelvic neoplasm or pregnancy can cause a lesion to the obturator nerve. what cutaneous sensations are altered? where is there muscle weakness?

Answer 9

medial thigh

adduction at hip

Question 10

diabetes, pelvic neoplasm, and psoas abscess can cause femoral nerve lesion. what cutaneous sensations are altered? where is there muscle weakness?

Answer 10

anterior thigh, medial leg to medial malleolus

flexion of hip, extension of leg at knee

Question 11

compression at neck of fibula, hip fracture, dislocation of femur, and piriformis syndrome can cause common fibular nerve lesion. what cutaneous sensations are altered? where is there muscle weakness? what is a common sign?

Answer 11

anterior and lateral leg, dorsum of foot
dorsiflexion, eversion
foot drop, steppage gait

Question 12

diabetes, hip fracture, and dislocation of femur can cause tibial nerve lesion. what cutaneous sensations are altered? where is there muscle weakness? what is a common sign?

Answer 12

posterior leg, sole, and lateral foot
plantar flexion, flexion of toes
can’t stand on tiptoes

Question 13

misplaced gluteal injection and pelvic neoplasm can cause superior gluteal nerve lesion. what cutaneous sensations are altered? where is there muscle weakness? what is a common sign?

Answer 13

no cutaneous sensations listed
abduction at hip
pelvic tilt/waddling gait

Question 14

pelvic neoplasm can cause inferior gluteal nerve lesion. what cutaneous sensations are altered? where is there muscle weakness? what is a common sign?

Answer 14

no cutaneous sensations listed

extension at hip from flexed position, can’t get up from chair