The Medacta International SMS Post-Marketing Surveillance Study

Who May Qualify: - Individuals with a severely painful and/or disabling hip joint with osteoarthritis, traumatic arthritis or developmental dysplasia of the hip or avascular necrosis of the femoral head. - In order to take part in this study, all study participants must be between the ages of 18 and 75 years of age, at the time of surgery. - Scheduled for a primary total hip replacement. Who Should NOT Join This Trial: - Active infection - Pregnancy - Mental illness where the known condition is likely to compromise the patient's ability to consent, affect the patient's assessment of their progress or complete the 10 year cycle of follow-up appointments and reviews - Grossly distorted anatomy (surgeon's discretion) - Osteomalacia where uncemented implant fixation is contraindicated - Active rheumatoid arthritis. - Osteoporosis - Metabolic disorders which may impair bone formation where uncemented implant fixation is contraindicated - Muscular atrophy or neuromuscular disease - Allergy to implant material - Any patient who cannot or will not provide willing to sign a consent form for participation in the study - Those whose prospects for a recovery to independent mobility would be compromised by known coexistent, medical problems Always talk to your doctor about whether this trial is right for you.