Provides stability and support for injuries to the first metacarpal-phalangeal (MCP) joint, the first carpo-metacarpal (CMC) joint, and the wrist joint. The TSFB is indicated for all injuries to the thumb, such as Bennett's or complex Rolando's fractures, suspected or confirmed navicular (scaphoid) fractures, and for other carpal bone injuries. The thumb extension, which completely immobilizes the first digit can be trimmed to any length to allow varied thumb flexion.