Which upper limb orthosis is a resting 'cock-up' splint, commonly known as a palmar splint?

• A. Dorsal wrist splint
• B. Airplane splint
• C. Palmar splint
• D. Wrist-driven prehension orthosis

Answer: (C)

A resting cock-up splint is a static hand-wrist orthosis that holds the wrist in slight extension while the hand rests on the palm side. This palmar (volar) support positions the wrist to optimize the length-tension relationship of the finger flexors, helping the fingers grip efficiently without requiring active movement at the wrist. It also helps prevent flexion contractures during immobilization and provides a comfortable, functional posture for the hand.

A dorsal wrist splint sits on the back of the hand and is chosen when dorsal stabilization is needed, not the palmar surface. The airplane splint and the wrist-driven prehension orthosis have more specific dynamic purposes related to tendon dynamics or using wrist motion to drive finger action, which are not the resting, static palmar approach described here.