Severe trauma to the hand usually also causes limited mobility in joints that are not injured, such as the shoulder and elbow joints. One reason is that after severe trauma to the hand requires a certain period of immobilization and braking, the injured person mistakenly believes that the whole upper limb cannot be moved. Secondly, due to the fear of injury, the injured person is afraid or unwilling to move the injured side of the limb, which eventually leads to the joints of the uninjured part will also become stiff. Therefore, after hand trauma, joint mobility training should be started as early as possible for uninvolved joints (such as shoulder, elbow, wrist and interphalangeal joints).