Abstract: A tibial trial insert includes an upper plate and lower plate. An adjustment arrangement between the upper and lower plates is actuatable to adjust a gap between the upper and lower plates. The adjustment arrangement includes a first lift with a first lever arm arrangement and a second lift with a second lever arm arrangement. Each lever arm arrangement is indirectly connected to the upper and lower plates and pivotally movable to vary its length and adjust the gap between the upper and lower plates. The first lift includes an actuator coupled to the first lever arm arrangement. Actuation of the actuator varies the length of the first lever arm arrangement. The adjustment arrangement includes a coupling that couples the second lift to the first lift and configured such that the length of the second lever arm arrangement is varied synchronously to the first lever arm arrangement.

Abstract: A modular instrument system for use in a knee joint replacement operation includes a tibial component, a first femoral component, a second femoral component and at least one spacer element. The different components of the modular instrument system are releasably connectable to one another to form different instrument configurations.

Abstract: A tibial trial insert includes an upper plate and lower plate. An adjustment arrangement between the upper and lower plates is actuatable to adjust a gap between the upper and lower plates. The adjustment arrangement includes a first lift with a first lever arm arrangement and a second lift with a second lever arm arrangement. Each lever arm arrangement is indirectly connected to the upper and lower plates and pivotally movable to vary its length and adjust the gap between the upper and lower plates. The first lift includes an actuator coupled to the first lever arm arrangement. Actuation of the actuator varies the length of the first lever arm arrangement. The adjustment arrangement includes a coupling that couples the second lift to the first lift and configured such that the length of the second lever arm arrangement is varied synchronously to the first lever arm arrangement.