Multicenter Mpact DM France

The primary objective of the study is to evaluate the 10-year performance of the MPACT DM cup in the treatment of patients requiring total hip arthroplasty evaluated through the Kaplan Meier curve.

The secondary objectives of the study are:

* To assess the function of the operated hip * Evaluate the safety of the implant * Evaluate the stability of the prosthetic components

Secondary endpoints were:

* Harris Hip Score The Harris Hip Score (HHS) items include an analysis of the operated hip according to pain, function, mobility and stability and a deformity analysis. The Harris Hip Score will be used to assess the patient's subjective and objective improvement in the above criteria. * Evaluation of standard radiographs from the front and side. Periprosthetic edging and osteolysis will be evaluated using Delee and Charnley zones for the acetabular component and Gruen zones for the femoral component. * Evaluation of implant stability and fit using the ARA score. This score is used to determine whether the implant causes changes in the surrounding bone structures. If signs occur, they can be considered either as "neutral", showing a simple adaptation and not reducing the result, or as "negative" to varying degrees. The maximum ARA score is 6 points, negative points from 1 to 4 can be attributed for each of these "negative" signs.

The arithmetic summation of these "risk factors" will lead to a final "score", defining the adaptation of the prosthesis to the bone sleeve at the time the images are taken, and which may naturally vary with time, either positively, if the fixation, which was precarious at the time, stabilizes (secondary osteoinduction by Hydroxyapatite of initial fibrosis zones, for example), or negatively in the presence of an evolving destabilization (there is obviously no negative score). The approach is similar for the femur and for the acetabulum.

❖ Collection of intraoperative and postoperative complications. Complications, such as infection, loosening, deep vein thrombosis (DVT), fracture, as well as other unexpected complications, will be evaluated.