Higher the lesion of the ulnar nerve injury, the less prominent is the deformity- This is called as Ulnar paradox
Assertion: Ulnar nerve injury at the wrist causes less clawing than at elbow
Reason: At the elbow, Ulnar nerve injury will paralyze flexor digitorum profundus also.
- A is true, R is false
2. A is false, R is true
3. A and R are true, R is the correct explanation of A
4. A and R are true, R is not the correct explanation
Answer:
2. A is false, R is true
The Ulnar paradox states – Higher the lesion of the ulnar nerve injury , the less prominent is the deformity
Therefore Ulnar nerve injury at wrist causes more clawing than at elbow because at elbow, Ulnar nerve injury will paralyze flexor digitorum profundus also and it will cause less interphalangeal flexion deformity.
