Mpact 3D Metal Monolit Study

Inclusion Criteria: 1. Patient with a disease that corresponds to the indications for use of Medacta implants (according to the instructions for use) 2. Patient eligible for primary total hip arthroplasty 3. Patient aged between 18 and 75 years 4. Patient covered by the French Social Security system or an equivalent protection scheme. 5. Patient able, in the investigator's opinion, to comply with the requirements of the study. Exclusion Criteria: 1. Patient suffering from inflammatory arthritis 2. Previously operated hip 3. Patient requiring a transplant 4. Hip tumour involved 5. Patient with progressive local or systemic infection 6. Severe acetabular dysplasia 7. Patient with muscle loss, neuromuscular disease or vascular impairment of the affected limb. 4\. Patient with known medical problems that may compromise independent recovery of mobility 5. Patient with a BMI greater than 40 kg/m². 6. Patient with major cognitive impairment that prevents him/her from fully understanding the requirements of the study 7. Patient living in a geographical area where study follow-up is not possible. 8. Patient taking part in interventional research 9. Minor patient 10. Protected adult patient 11. Vulnerable person according to article L1121-6 of the Public Health Code