What is the safe position for digits when creating an orthotic for a 5th metacarpal fracture at the head of the MC?

What is the safe position for digits when creating an orthotic for a 5th metacarpal fracture at the head of the MC?

• A. Intrinsic plus
• B. Protecting collateral ligaments with MCP slight Flexion (50-70) wrist 20 degrees extension
• C. MCP slight Flexion with no other instructions
• D. Neutral digits with wrist extension

Answer: (A)

The key idea is to immobilize the hand in a position that protects the MCP joints and their supporting ligaments while minimizing stiffness. The safe, or intrinsic plus, position does this by placing the metacarpophalangeal joints in flexion (about 60–70 degrees) while keeping the interphalangeal joints extended and the wrist in a neutral (or slight extension) position. This posture places the collateral ligaments and the joint structures in a stable, protected alignment, reducing the risk of ligament shortening or joint drift and helping maintain tendon gliding and the hand’s arch during healing. Other positions don’t offer the same protection: less-than-full MCP flexion or a neutral MCP position can let the collateral ligaments shorten or the joints drift, and additional wrist extension changes tendon tension in ways that aren’t ideal for a head-of-metacarpal fracture healing.

The key idea is to immobilize the hand in a position that protects the MCP joints and their supporting ligaments while minimizing stiffness. The safe, or intrinsic plus, position does this by placing the metacarpophalangeal joints in flexion (about 60–70 degrees) while keeping the interphalangeal joints extended and the wrist in a neutral (or slight extension) position. This posture places the collateral ligaments and the joint structures in a stable, protected alignment, reducing the risk of ligament shortening or joint drift and helping maintain tendon gliding and the hand’s arch during healing.

Other positions don’t offer the same protection: less-than-full MCP flexion or a neutral MCP position can let the collateral ligaments shorten or the joints drift, and additional wrist extension changes tendon tension in ways that aren’t ideal for a head-of-metacarpal fracture healing.