A number of conditions—tendonitis, DeQuervain's tendonitis, Gamekeeper's thumb, sprains and strains, post-cast healing, etc.—require immobilization to get better. This wrist brace with thumb spica restricts motion with a brace and a "spica"—the part of the brace that spreads thumb away from the hand. You'll feel better when injured area is allowed to heal while pain, swelling and muscle spasms are reduced.