PFJPMCFZimmer(R) Gender Solutions(TM) Patello-Femoral Joint Prothesis Used Within the Knee Registry Protocol

Study start date: November 1, 2011

Inclusion Criteria: * Patient is greater than 18 years of age; * Patient selection is without bias to race or gender; * Patient is in stable health and able to undergo surgery; * Patient has patellofemoral joint(s) affected by disease process and/or injury and qualifying for primary unilateral or bilateral replacement of the femoral trochlea based a primary diagnosis of at least one of the following: * Osteoarthritis * Traumatic Arthritis * Polyarthritis * Severe Chondrocalcinosis * Salvage of previously failed surgical attempts (e.g., arthroscopy, lateral release, cartilage transplantation) * History of patellar dislocation or patella fracture * Dysplasia-induced patellofemoral degeneration * Patient is willing and able to cooperate in prescribed post-operative therapy; * Patient is willing and able to complete scheduled follow-up evaluations as described in the Informed Consent; * Patient has participated in the Informed Consent process and has signed an IRB approved Informed Consent. * Patient has not history of previous prosthetic replacement device(s) of any type in the affected knee joint; * Independent of study participation, patient is scheduled to receive treatment using a Zimmer Gender Solutions Patellofemoral Joint Prosthesis (PFJ). Exclusion Criteria: * Patient with an acute, chronic, local or systemic infection; * Patient is skeletally immature; * Patient is pregnant; * Patient is a prisoner, mentally incompetent or anticipated to be non-compliant. Patient has a known allergy to one of the constituents of the implant, e.g. cobalt, chromium, nickel, etc.; * Patient has Rheumatoid Arthritis (RA) AND an ulcer of the skin OR a history of recurrent breakdown of the skin; * Patient has neuropathic arthropathy, neuromuscular disorder, neurologic condition, vascular disorder, systemic disease and/or other condition that affects lower limb function and/or could contribute to prosthesis instability, prosthesis fixation failure, and/or complications in postoperative care; * Patient has a Body Mass Index (BMI) greater than 40; * Patient has insufficient native bone stock in the operative joint (e.g. osteoporosis, osteonecrosis, tumors, cysts, etc.). Note: Bone void fillers are NOT considered native bone stock, even if autograft is used; * Patient has severe instability, maltracking, or malalignment of the patella, patellofemoral, and/or tibiofemoral joints; * Patient has patellectomy of the affected joint, including previous patellectomy, patellectomy performed simultaneous to study PFA, or scheduled patellectomy; * Patient has insufficient menisci and/or ligament structures (e.g. non-functional/absent ACL and/or PCL); * Patient exhibits tibiofemoral degeneration and/or Outerbridge grade greater than or equal to 3 in EITHER: * one (medial or lateral) tibiofemoral compartment that is not treated with a simultaneous compatible Zimmer unicompartmental knee replacement; OR * both (medial AND lateral) tibiofemoral compartments, regardless of treatment.