Anatomy Etc

Question 1

Describe the features of L3 nerve root compression [3]

Answer 1

• Sensory loss over anterior thigh
• Weak hip flexion, knee extension and hip adduction
• Reduced knee reflex

Question 2

Features of L4 nerve root compression? [4]

Answer 2

• Sensory loss anterior aspect of knee and medial malleolus
• Weak knee extension and hip adduction
• Reduced knee reflex
• Positive femoral stretch test

Question 3

What is the presentation of an L5 nerve root compression? [4]

Answer 3

• Sensory loss dorsum of foot
• Weakness in foot and big toe dorsiflexion
• Reflexes intact
• Positive sciatic nerve stretch test

Question 4

Describe the pattern seen in S1 nerve root compression [4]

Answer 4

• Sensory loss posterolateral aspect of leg and lateral aspect of foot
• Weakness in plantar flexion of foot
• Reduced ankle reflex
• Positive sciatic nerve stretch test

Question 5

upper limb like brachial plexus etc

Question 6

Whats a good way of remebering if sensitive/specific helps to rule in / out? [1]

Answer 6

Remember SNOUT and SPIN.

SeNsitive tests are good at ruling things OUT.

SPecific tests are good at ruling things IN.

Question 7

L3 nerve root compression has sensory loss where? [1]

Answer 7

Sensory loss over anterior thigh

Question 8

L4 nerve root compression has sensory loss where? [1]

Answer 8

Sensory loss anterior aspect of knee and medial malleolus

Question 9

L5 nerve root compression causes sensory loss where? [1]

S1 nerve root compression causes sensory loss where? [1]

Answer 9

L5: dorsum of foot; medial aspect of food

S1: Sensory loss posterolateral aspect of leg and lateral aspect of foot

Question 10

Describe the sensory loss in each of L3-S1 if nerve root becomes compressed [4]

Answer 10

L3: Sensory loss over anterior thigh
L4: Sensory loss anterior aspect of knee and medial malleolus
L5: dorsum of foot; medial aspect of food
S1: Sensory loss posterolateral aspect of leg and lateral aspect of foot