Randomized Controlled Clinical Evaluation to Compare Vanguard Cruciate Retaining and AGC Total Condylar Knee Implants

Inclusion Criteria: * Pre-op knee score of \<70 * Scheduled to undergo primary total knee replacement with any of the following indication: 1. pain and disabled knee joint resulting from Osteoarthritis, Rheumatoid Arthritis, or Traumatic arthritis. 2. One or more compartments involved. * Need to obtain pain relief and improve function * Ability and willingness to follow instructions, including control of weight and activity level, and to return for follow-up evaluations * A good nutritional state of the patient * Full skeletal maturity of the patient, patients who are at least 18 years of age. * Patients of either sex * Consent form read, understood, and signed by patient Exclusion Criteria: * Pre-op knee score greater than or equal to 70 * Infection * Osteomyelitis * Previous partial or total prosthetic knee replacement on the operative side * Skeletal immaturity of the patient, patients who are less than 18 years of age. * Sepsis * Uncooperative patient or patient with neurological disorders who are incapable of following directions * Osteomalacia * Distant foci of infections * Rapid joint destruction, marked bone loss, or bone resorption apparent on roentgenogram * Vascular insufficiency, muscular atrophy, or neuromuscular disease in affected limb * Incomplete or deficient soft tissue surrounding the knee