Radiographic Changes and Clinical Implications of Implantation of Shortened Uncemented Femoral Stems in THA

Inclusion criteria: * Male or female (age ≥18 years old) * Subject operated for first-line THA for an indication of centric hip osteoarthritis (including minor dysplasia and coxa profunda) and aseptic osteonecrosis of the femoral head * Subject who received a THA between January 2015 and December 2019 * Subject who received an uncemented shortened SCC or SCLA femoral stem * Radiological data available: pre-operative, immediate post-operative and post-operative at a minimum of 2 years (≥24 months) * Subject not objecting to the reuse of their data for scientific research purposes. Exclusion criteria: * Subject having expressed its opposition to the reuse of its data for scientific research purposes. * Patient operated for inflammatory pathology or major dysplasia, recovery * Associated fractures or sequelae of fractures * Patient having presented intraoperative or early complications such as infections, intraoperative fracture, dislocation of the hip following the installation of the THA * Revision of hip arthroplasty during the study follow-up period for a cause not studied in the study.