A thumb spica splint is a medical device designed to immobilize the thumb and wrist. It is commonly used to treat injuries such as fractures, sprains, or tendonitis. The splint helps to stabilize the affected area, allowing for proper healing while minimizing pain and discomfort. Typically made from materials like foam or thermoplastic, the thumb spica splint wraps around the thumb and extends to the wrist. It is adjustable and can be secured with straps to ensure a snug fit. This type of splint is often recommended by healthcare professionals for both acute injuries and post-surgical recovery.