Post-marketing Surveillance Study of the Saphir Stem in Primary Hip Surgery

This post-market study follows patients who receive a hip replacement using a specific device called the Saphir Stem. The goal is to collect long-term, real-world data on how well this hip implant performs, including pain relief, movement, and how long the implant lasts. No experimental treatment is given — this is an observation study for people already receiving this device as standard care. You may be eligible if: - You are 18 years old or older - You are scheduled for a primary (first-time) total hip replacement - You have osteoarthritis (up to age 85) or a femoral neck fracture (up to age 90) - You have a social security scheme and have given consent to participate You may NOT be eligible if: - You are under 18 years old - You are pregnant - You have already had a hip replacement on the same side - You have a cancer that has spread to the bone or surrounding area - You are unable to understand the study requirements or give consent - You are under legal guardianship Talk to your doctor to see if this trial is right for you.