Patent ID: 7309322

Claim:
A device for applying a ventrally or dorsally directed translatory force onto a lower leg in the area of a knee joint for treatment or follow-up treatment of knee instability, the device comprising a thigh bar which can be secured on a thigh, with a lower-leg bar device, which acts on the lower leg, coupled in an articulated manner to the thigh bar and operatively connected to a fixation device that can be secured on the lower leg, and a spring device which generates a defined pretensioning force and acts on the lower-leg bar device, wherein: the lower-leg bar device has a shorter bar arm and a longer bar arm, both bar arms being able to swivel relative to the thigh bar, the two bar arms are arranged so as to be able to swivel relative to one another, the shorter bar arm is coupled at its distal end to the fixation device in an area close to the knee, whereas the longer bar arm is coupled with its distal end to the fixation device in an area farther away from the knee, and the pretensioning force of the spring device acts between the shorter and longer bar arms in such a way that the bar arms are urged to execute a swiveling movement relative to each other, such that a ventrally or dorsally directed translatory force is applied to the fixation device in the area close to the knee.