Aetiology
Dislocation of carpometacarpal joint of the thumb is a relatively common injury. It is most often caused by a direct blow to the thumb or an indirect force applied to the lower joint of the thumb. It can also occur from a fall onto an outstretched hand.
Diagnosis
Diagnosis of dislocation of carpometacarpal joint of the thumb is usually made through imaging studies such as X-rays or CT scans. Physical examination may also reveal swelling, tenderness and deformity of the thumb.
Differential diagnosis
Differential diagnosis of dislocation of carpometacarpal joint of the thumb includes fracture, tendon injury, ligament injury, and arthritis.
Treatment
Treatment of dislocation of carpometacarpal joint of the thumb is based on the severity of the injury. It may involve closed reduction of the joint, immobilization with a splint, and physical therapy to restore range of motion and strength. Surgery may be necessary in more severe cases.
Prognosis
Prognosis of dislocation of carpometacarpal joint of the thumb is generally good with appropriate treatment. Most patients regain full strength and range of motion of the joint.