The Quengle cast (1) has an adjusting member for generating a Quengle force acting on the joint. The adjusting member is part of a correcting unit with a pressurized basic body. To generate a defined Quengle force, a pressure that can be preset by means of a control unit (5) can be set in the basic body, as a result of which the adjusting member can be deflected in relation to the basic body.