Post-Market Study of the 3DKnee™ System

Inclusion Criteria: * This must be a primary knee replacement on this knee. * Patient is over 18 years of age or older * Have knee joint disease related to one or more of the following * degenerative joint disease, including osteoarthritis or traumatic arthritis * Avascular necrosis of the femoral condyles * Post-traumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy * Moderate valgus, varus, or flexion deformities * Rheumatoid arthritis * Patient is likely to be available for evaluation for the duration of the study * Able and willing to sign the informed consent and follow study procedures * Patient is not pregnant Exclusion Criteria: * Is younger than 18 years of age * If there has been a total knee replacement on this knee in the past (no revisions allowed in study) * Infection, or history of infection, acute or chronic, local or systemic * Alcoholism or other addictions * Muscular, neurological or vascular deficiencies which compromise the affected extremity * Obesity * Insufficient bone quality * Loss of ligamentous structures * High levels of physical activity * Materials sensitivity * Prisoner * Mental conditions that may interfere with the patient's ability to give an informed consent or willingness to fulfill the study requirements * Patient is pregnant