Extensor tendon injury

Hand tendon injuries are mostly open, with many cutting injuries, often accompanied by neurovascular injuries or bone and joint injuries, and closed lacerations can also occur. After a tendon rupture, the corresponding joint loses its mobility. If the superficial flexor tendon is broken, the proximal interphalangeal joint cannot be flexed; the deep flexor tendon is broken, as the distal interphalangeal joint cannot be flexed; if the superficial flexor tendon is broken, the distal and proximal interphalangeal joint cannot be flexed. Since the internal hand muscles are still intact, the metacarpophalangeal joint flexion is not affected. Different parts of the extensor tendon are broken, and their corresponding joints cannot be extended, and deformities can occur.