First CMC joint osteoarthritis is commonly managed with which splint?

• A. Ulnar gutter splint
• B. Thumb spica splint
• C. Finger splint
• D. Resting hand splint

Answer: (B)

Immobilizing the base of the thumb to rest the carpometacarpal joint is the most effective nonoperative approach for first CMC joint osteoarthritis. A thumb spica splint stabilizes the CMC joint and limits motion at the thumb during pinch and grip, reducing painful loading and shear across the joint. This targeted support allows functional use of the hand with less pain and helps protect the joint during daily tasks. Other splints don’t provide this specific immobilization: an ulnar gutter splint is for immobilizing the ulnar side of the hand and digits, a finger splint fixes individual fingers, and a resting hand splint mainly immobilizes the wrist and some MCP joints without adequately stabilizing the thumb base.