The Medacta International SMS Post-Marketing Surveillance Study

This study is tracking the long-term outcomes — over 10 years — of patients who receive a specific hip replacement implant (the Medacta SMS system), to monitor how well the artificial joint performs over time. **You may be eligible if...** - You are between 18 and 75 years old - You are scheduled for your first (primary) total hip replacement - Your hip is severely painful or limited due to osteoarthritis, traumatic arthritis, developmental hip problems, or bone death (avascular necrosis) in the hip joint **You may NOT be eligible if...** - You have an active infection - You are pregnant - You have a mental illness that would affect your ability to consent or complete follow-up visits over 10 years - Your hip anatomy is severely abnormal - You have a bone-softening condition (osteomalacia) that makes uncemented implants unsafe - You have active rheumatoid arthritis or other disqualifying conditions in the surgeon's judgment Talk to your doctor to see if this trial is right for you.