Patent attributes
The invention relates to an adjustment apparatus for the selection of suitable implant sizes in knee operations having a lower work unit supportable at the tibia and an upper work unit supportable at the femur, which are vertically adjustable relative to one another and with which the spacing between the tibia and the femur can be set by spreading apart the knee, wherein the upper work unit includes a carrier vertically adjustable to the lower work unit and at least two different functional units which are releasably conducted to the carrier and of which the one is designed as an extension unit serving for the spreading apart of the knee with the femur in extension and the other is designed as a flexion unit serving for the spreading apart of the knee and for the selection of a suitable implant size with the femur in flexion, wherein the flexion unit includes a base unit couplable to the carrier and a central guide piece which can be suspended at the femur and which can alternatively be brought into a condition freely movable in height or fixed relative to the base section and wherein, when the guide piece is fixed, the knee can be spread by changing the spacing between the lower work unit and the carrier and, when the guide piece is freely movable, the base section is adjustable in height relative to the guide piece which can be suspended at the femur.
