The Patello Femoral HemiCAP® Systems restore the unique articular surface geometry of the Patella and the Femoral Trochlea Groove. This creates a congruent pathway by using an intraoperative 3-dimensional mapping system with contoured articular resurfacing implants. The PF Classic system is indicated for isolated as well as contained lesions of the trochlea groove and patella. The PF Wave System, however, is indicated for those patients who have more diffuse and/or extensive damage to their PF join