The healing of an extensor tendon rupture depends on whether or not there is significant separation and displacement of the extensor tendon after the rupture. If there is significant separation and displacement, that is, if the ends are not in direct contact, then healing cannot be achieved by conservative treatment and must be facilitated by surgical suturing. If the extensor tendon is ruptured and the two ends are still in contact or partially ruptured, conservative treatment can be used to achieve a healing effect. Specifically, after the rupture of the extensor tendon, the functional position of the affected limb should be fixed in a cast or brace for about 3-4 weeks, and the fixation device, such as cast or brace, can be removed after 3-4 weeks to evaluate the function of the extensor tendon, and if the functional recovery of the extensor tendon is judged to be good, the functional exercise of the extensor tendon can be gradually resumed. It takes about 3 months after the injury for the strength of the extensor tendon to be fully restored.