Final answer:
The functional position of the wrist and hand involves wrist extension at 20 degrees, ulnar deviation at 10 degrees, metacarpophalangeal joint flexion at 45 degrees, proximal interphalangeal flexion at 30 degrees, and slight distal interphalangeal joint flexion.
Step-by-step explanation:
The functional position of the wrist and hand is a position that allows for optimal usage and stability while minimizing stress on the joints. This position is commonly used when splinting a hand or wrist to ensure that in the event of immobilization or injury, the hand remains in a position most functional for use after recovery. The accepted functional position of the wrist and hand is wrist extension of approximately 20 degrees, a small degree of ulnar deviation (10 degrees), metacarpophalangeal (MCP) joint flexion at about 45 degrees, proximal interphalangeal (PIP) joint flexion at 30 degrees, and slight flexion at the distal interphalangeal (DIP) joints. The thumb is typically positioned in opposition to allow for grasping and pinching.
Accordingly, the correct functional position of the wrist and hand mentioned in the options provided to the student would be: wrist extension (20 degrees), ulnar deviation (10 degrees), metacarpophalangeal flexion (45 degrees), proximal interphalangeal flexion (30 degrees), and slight distal interphalangeal joint flexion, which corresponds to option B.