M60-M79: Soft tissue disorders

M65-M68: Disorders of synovium and tendon

The group of conditions known as disorders of synovium and tendon generally involves inflammation or degeneration of the synovial membrane (the lining of the joint) or the tendons (the fibrous structures connecting muscle to bone). Common causes include overuse, injury, and certain diseases like rheumatoid arthritis or gout. Early symptoms often involve pain, swelling, or stiffness around the affected joint or tendon, commonly during or after movement. As the conditions progress, problems with mobility, strength, and function might occur. These disorders impact the musculoskeletal system, particularly the joints and surrounding structures, and can affect various sites in the body, from larger joints like the knee or shoulder to smaller areas like the wrist or fingers. These disorders may also lead to the formation of abnormal structures like cysts or nodules.