Exception Cementless Hip Stem

At the time of surgery, the inclusion criteria were based on the indications presented in the IFUs: * Primary or secondary osteoarthritis * Inflammatory impairment of the hip, rheumatoid arthritis, etc. * Fracture of the neck of the femur * Avascular necrosis of the femoral head * Sequelae from previous operations on the hip, osteotomies, etc. * Congenital hip dysplasia. * Patient is older than 18 years old * Patient had consented to the original data collection after his/her surgery At the time of surgery, the exclusion criteria were based on the contraindications presented in the IFUs: * Local or systemic infections. * Serious muscular, neurological or vascular deficiencies in the limb concerned. * Bone destruction or poor quality bone likely to affect the stability of the implant (Paget's disease, osteoporosis, etc.) * Any concomitant disorder likely to affect the function of the implant. * Allergy to one of the implant components. * Patients weighing more than 110 kg. * Patient incapable of following the recommendations of the surgeon