28 mm Ceramic-on-Ceramic Acetabular Cup Total Hip Replacement Study

Inclusion Criteria: * Non-inflammatory degenerative joint disease. Composite diagnoses of NIDJD include osteoarthritis, avascular necrosis, post-traumatic arthritis, slipped capital femoral epiphysis (SCFE), fracture of the pelvis, and developmental dysplasia. * X-ray evaluation confirms the presence of NIDJD * Femoral and acetabular bone stock is sufficient, regarding strength and shape, and is suitable to receive the implants. * Individuals 20 to 75 years of age at the time of surgery * Patients with a previous total hip replacement of the contralateral leg who have a pain rating of none or slight and who are at least one year post arthroplasty are eligible for participation in the study. * Harris Hip Score of 70 or lower * Pain at least Moderate Exclusion Criteria: * Presence of a previous prosthetic hip replacement device (any type, including surface replacement arthroplasty, endoprosthesis, etc.) in the hip joint to be operated. * Previous Girdlestone procedure (resection arthroplasty) or surgical fusion of the hip to be operated. * Acute femoral neck fracture. * Above knee amputation of the contralateral and/or ipsilateral leg. * Patients with bilateral degenerative joint disease requiring staged or simultaneous hip replacements. * Patients with an existing total hip arthroplasty in the contralateral hip with a Harris Hip pain rating of mild, moderate, marked or totally disabled. * Patients who have undergone total hip arthroplasties in their contralateral hips withi…