Single site, pilot study to evaluate the safety and clinical effectiveness of the M-Finity stem in primary total hip arthroplasty through a CT-based migration analysis.

Total Hip Arthroplasty (THA) is a procedure commonly performed for end-stage hip osteoarthritis, in which the damaged bone and cartilage of the hip joint are removed and replaced with prosthetic components. The procedure involves accessing the hip joint via an appropriate surgical approach, resecting the femoral head, preparing the acetabulum and femur, and implanting the acetabular cup and femoral stem. The femoral head is then attached to the stem, and the hip is reduced to assess joint stability and leg length. Patients meeting the eligibility criteria for THA will be considered for enrolment in this study. The total surgical procedure typically takes approximately 1 to 2 hours, depending on patient anatomy and surgical approach. The implantation of the femoral stem component specifically takes approximately 20–30 minutes within this timeframe. The M-Finity femoral stem, designed for THA, aims to provide optimal fit and stability. Each participant will receive the Medacta M-Finity femoral stem along with a compatible Medacta Acetabular Cup as part of routine total hip replacement. These devices will be implanted by an experienced orthopaedic surgeon following standard practice. The study aims to evaluate the safety and clinical effectiveness of the M-Finity femoral stem, which features a triple-tapered design with reduced distal width to enhance proximal fit and minimize distal impingement. Operative reports and intraoperative checklists will be reviewed to confirm that the M-Finity femoral stem was used as intended. Implant labels will be verified to ensure traceability and correct device allocation. Any deviations from the standard procedure will be documented and reviewed by the study team.