What is the primary function of a thumb spica splint?

The primary function of a thumb spica splint is to immobilize the carpometacarpal joint. This is crucial in the management of conditions that affect the thumb, such as fractures, ligament injuries, or arthritis. By immobilizing this joint, the splint helps decrease pain and allows for healing by limiting movement that could exacerbate the condition or hinder recovery. Immobilization also protects the area from additional injury during activities of daily living.

While other choices may reflect functions of different types of splints or interventions, they do not accurately describe the primary purpose of a thumb spica splint. For instance, while it may have a secondary effect of reducing inflammation from tendonitis by providing rest, that is not its main function. Similarly, although a thumb spica splint can provide some support during wrist fractures, its specific design focuses on immobilizing the thumb area, particularly around the carpometacarpal joint. Promoting active movement of the fingers is contrary to the splint’s intent, as it is designed to restrict movement to facilitate healing in the thumb region.