The Arthrosurface Patello-Femoral HemiCAP system is a surgical method for the treatment of localized cartilage lesions and defects in the major joints. This system is comprised of three elements: 3-D mapping technology Set of instruments to map and prepare the damaged area Cobalt-chrome and titanium implant placed opposite to a polyethylene implant The system precisely aligns the surface of the implant to the contours of the patient's articular cartilage surface, thus filling the defect and restoring a smooth and continuous articular surface. The HemiCAP system has been developed so that it can be utilized via minimal access surgical techniques. There are 2 systems that comprise the Patello-Femoral Line: Patello-Femoral Classic HemiCAP: Used for isolated and well contained lesions of the trochlea groove and the patella. Patello-Femoral WAVE: Used for those patients that have more diffuse or extensive damage to their PF joint. Both systems use the same proven intraoperative mapping technology of all HemiCAP systems.