A spica splint is a type of orthopedic splint used to immobilize the thumb and/or wrist while allowing other digits freedom to move. It is used to provide support for thumb injuries (ligament instability, sprain or muscle strain), gamekeeper's thumb, osteoarthritis, de Quervain's syndrome, scaphoid fracture, thumb sprains, post-operative use, and post-removal of casting of the hand/thumb.
A spica splint consists of a metal enclosed in a fabric, which is pliable and can be moulded according to the shape and size of the hand. Velcro strips are used to secure and maintain the splint on the hand and help in comfortably fitting the splint to a variety of hands. Even injuries like metacarpal fractures and wrist fractures can benefit from spica splints. Thumb Spica splint, Cock-up splint, are used for acute injuries like sprains and fractures. Dynamic Cock-up splint is a special kind of spica splint, which is used in nerve palsies of the hand for preventing contractures and physical therapy.
Thermoplastic splint
There is also a thumb spica splint made with thermoplastic material. However, a thermoplastic splint is sensitive to heat, such as hot water or prolonged direct sunlight exposure, which might melt the material.