A Prospective Munti-center Study on VANGUARD™ PS Total Knee Replacement System

Inclusion Criteria: * Painful and disabled knee joint resulting from osteoarthritis, rheumatoid arthritis, traumatic arthritis, where one or more compartments are involved. * Correction of varus, valgus, or posttraumatic deformity. * Correction or revision of unsuccessful osteotomy, arthrodesis, or failure of previous joint replacement procedure * Need to obtain pain relief and improve function * Ability and willingness of the patient to follow instructions, including control of weight and activity level * A good nutritional state of the patient, and * The patient must have reached full skeletal maturity (at least 18 years old). Exclusion Criteria: * infection * sepsis * osteomyelitis * Uncooperative patient or patient with neurologic disorders who are incapable of following directions * Osteoporosis * Metabolic disorders which may impair bone formation * Osteomalacia * Distant foci of infections which may spread to the implant site * Rapid joint destruction, marked bone loss or bone resorption apparent on roentgenogram * Vascular insufficiency, muscular atrophy, neuromuscular disease * Incomplete or deficient soft tissue surrounding the knee