A method of performing a knee replacement procedure in an individual in need thereof. The method comprises preparing the distal end of the individuals femur to receive a femoral component of a knee prosthesis. The preparation includes resecting a proximal surface and a distal surface of a medial and/or lateral condyle of the femur, determining the amount of uncut bone left between said resected proximal and distal surfaces after said resection, and then determining, from the amount of uncut bone, a pre-operative, natural profile of a trochlear groove between the medial and lateral condyles of the individuals femur. A selection of femoral components can then be provided with the one selected preferably having medial and lateral condyle components and a trochlear section therebetween that has a profile which substantially matches the natural profile of the trochlear groove of the individual. Knee prostheses components and kits are also provided.
