Comparing Dual-mobility Cups Versus Unipolar Cups for Unselected Primary Total Hip Arthroplasty by Direct Anterior Approach

Inclusion Criteria: * men and women aged ≥18 years old * set to undergo elective primary THA via direct anterior approach (DAA) * affiliated with a social security scheme * able to answer questionnaires and to communicate freely in French * who have been informed and have provided free, informed, and written consent (no later than the day of inclusion and before any examination required by the study) Exclusion Criteria: * with prior ipsilateral hip surgery * with prior contralateral hip surgery * that require acetabular cup diameters ≤50mm (because DM cups are not available from the same manufacturer for diameters ≤50mm, and UP cups require head diameters of 36mm and thus minimum cup diameters of 52mm) * undergoing emergency or trauma surgery (e.g. femoral neck fractures) * with any concomitant disease or disorder which, in the opinion of the surgeon, may put the patient at risk, notably of hip instability or dislocation (hip dysplasia, neuromuscular deficit, fracture sequelae…) or may influence the result of the study * that are pregnant or breastfeeding * under legal protection (guardianship or curatorship or deprived of liberty).