A thumb spica splint is a type of orthopedic 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 movement. These splints are typically made from materials like foam or thermoplastic and are adjustable for comfort. They are often recommended by healthcare professionals, such as orthopedic doctors or physical therapists, to support recovery after surgery or injury, ensuring that the thumb remains in a safe position during the healing process.