In the radial nerve palsy scenario, which orthosis best directly maintains the wrist in extension to facilitate finger function?

• A. Dorsal forearm orthotic
• B. Forearm-based wrist orthotic in 30° extension
• C. Anti-claw orthosis
• D. Hand-based short thumb spica

Answer: (B)

When the radial nerve is affected, wrist and finger extensors weaken, causing wrist drop. To maximize finger function, you want the wrist held in extension so the passive tension of the finger flexors can drive grip through the tenodesis effect. A forearm-based wrist orthosis set to about 30 degrees of extension directly places the wrist in a functional extended position, providing a stable base for finger movement and improving the ability to grip. Other options either don’t specify an exact extension angle, target different patterns (like clawing), or immobilize the hand in a way that doesn’t specifically favor this extension-driven grip.