Figure 5: A: Photograph of a CT-based, mechanical axis-aligned customised cutting jig of the femur. The model of the patient’s distal femur is also shown. B. Corresponding jig and bone model for the tibia (same patient). The jigs are made to fit perfectly on the models of the femur (C) and tibia (D). Performing this manoeuvre intra-operatively allows the surgeon to locate which bony excrescences the jigs are designed to rest on. These are the areas where soft tissue or cartilage needs be removed (patient details have been deleted).