This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Peripheral Nerve Injury, Subject name: Orthopaedics
Ulnar paradox is due to: 
Select and explain. 
A. FDP, B. FPL, C. ECRB, D. Radial nerve disease
A: FDP
Answer: A: FDP 
Explanation: Ulnar paradox The higher the lesion of the median and ulnar nerve injury , the less prominent is the deformity and vice versa, because in higher lesions the long finger flexors are also paralysed (which were causing interphalangeal flexion/clawing). The loss of finger flexion makes the deformity look less obvious/ less clawing In low ulnar nerve palsy forearm muscles are spared but the clawing is more ( as compared to high ulnar nerve palsy) because in low ulnar nerve palsy finger flexors are spared which adds on to the deformity by flexing IP joints.