As an injury of muscle and tendon occurs because of violent forces, there may come various complications in either early or late stage. Therefore, it should be given a careful examination, and the complication should be treated simultaneously. Otherwise, the recovery of articular function will be affected.

Avulsed fracture:
It is usually caused by indirect violence. The muscle tendon attaching to apophysis of joint suddenly and greatly contracts, resulting in avulsion fracture.

Nervous injury:
Based on movement of the limb, the range of anesthesia and whether there is atrophy of muscle, the site and extent of nervous injury may be by and large judged.

Ossifying myositis:
See the section of complications of fracture.

Intracapsular corpus liberum:
It is also called "joint mouse". There is injury of articular cartilage in the case of tendon injury. The injured cartilage gradually develops into a small bone, then the bone exfoliates and becomes a corpus liberum, which often changes its position following the joint movement. This commonly occurs in the knee joint.

Bony arthritis:
Injury of tendon in joint, if not properly treated in the early stage, may cause retrograde degeneration of articular cartilage surface in the late stage, then the weight-bearing will become unbalanced, and there may occur arthralgia, functional disturbance, etc..