Abstract: A seat apparatus for facilitating movement of a user from a sitting position to a standing position is provided. The seat apparatus includes a main body having a bottom surface, a back wall and a pair of lateral walls which are connected together and define a recessed region configured for sitting in. The main body further includes a seat projection extending upwardly from the bottom surface, between the lateral walls, whereby the seat projection is shaped and adapted to maintain thighs of a user separated on either side thereof. The seat apparatus also comprises a base provided below the main body and adapted to cooperate therewith. At least one of the base and main body has a convex and curved cross-sectional profile adapted to allow the apparatus to pivot about at least one axis in order to tilt the main body forward and urge a user in the standing position.

Abstract: A surgical instrument and kit including it, for use to carry out a cone-shaped sub trochanteric rotational osteotomy. The instrument has a guide that is fixed to a cervical screw which has been previously inserted into the femoral head along the axis of the cone to be cut. A drill bit driven in rotation about its own axis passes through the guide in an oblique hole extending at an angle equal to half the angle of the cone to be cut. The drill bit penetrates the lateral wall of the femur as close as possible to the cervical screw. Cutting of the cone is achieved by lateral displacement of the drill bit in a circular motion, which is progressively enlarged as the bit moves forward. In addition to the instrument, the kit contains a chisel with cutting wings, which is insertable in the cervical screw to allow the wings to make slits in the bone.