[Restoration of movement in the joints with the aid of a hinge-distraction apparatus].
The device described presents an external hinge which is fixed by transosseous wires and reproduces as far as possible the normal kinematics of the joint. By removing all load from the joint surfaces and maintaining a constant predetermined space between them, the apparatus eliminates friction, prevents pain and muscle spasm, and minimizes abnormal mobility (or instability). It also permits gradual and controlled reduction of old traumatic or congenital dislocations or contractures. Once the bones are in proper relationship, the apparatus permits graduated, controlled, nearly frictionless motion about the correct axis so that a good range of motion is restored and joint surfaces of the proper shape are formed. Finally, ununited fractures close to the joint surface may be immobilized while joint motion is permitted. Experience gained with the apparatus has shown that the method described is physiological and not difficult, complications associated with its use being rare and not serious. The good results obtained with the use of the apparatus warrant its wider application.