In claw deformity, which sensory areas are affected?

Study for the NBCOT Hand Injuries and Intervention Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for success!

Multiple Choice

In claw deformity, which sensory areas are affected?

Claw deformity stems from ulnar nerve palsy, which leaves the intrinsic hand muscles (interossei and the medial two lumbricals) paralyzed. When these muscles lose function, the intrinsic balance that normally steadies the metacarpophalangeal joints is disrupted, producing the characteristic clawing posture. Sensory loss mirrors the ulnar nerve’s distribution. The ulnar nerve supplies sensation to the little finger, the ulnar half of the ring finger, and the corresponding palm area on the ulnar (medial) side of the hand, including the palmar surface there as well as the dorsum over those same digits. So the sensory deficits in claw deformity are best described as affecting the palmar ulnar hand and the ulnar aspect of the digits. If a source labels the affected area as the lateral palm, be aware that “lateral” is often used inconsistently in different texts. The precise clinical pattern to remember is the ulnar distribution: little finger and ulnar side of the ring finger along with the adjacent palmar surface of the hand. This mapping helps explain both the motor changes creating clawing and the sensory changes the patient would report.

Claw deformity stems from ulnar nerve palsy, which leaves the intrinsic hand muscles (interossei and the medial two lumbricals) paralyzed. When these muscles lose function, the intrinsic balance that normally steadies the metacarpophalangeal joints is disrupted, producing the characteristic clawing posture.

Sensory loss mirrors the ulnar nerve’s distribution. The ulnar nerve supplies sensation to the little finger, the ulnar half of the ring finger, and the corresponding palm area on the ulnar (medial) side of the hand, including the palmar surface there as well as the dorsum over those same digits. So the sensory deficits in claw deformity are best described as affecting the palmar ulnar hand and the ulnar aspect of the digits.

If a source labels the affected area as the lateral palm, be aware that “lateral” is often used inconsistently in different texts. The precise clinical pattern to remember is the ulnar distribution: little finger and ulnar side of the ring finger along with the adjacent palmar surface of the hand. This mapping helps explain both the motor changes creating clawing and the sensory changes the patient would report.

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