Post-marketing Surveillance Study of the Saphir Stem in Primary Hip Surgery

Inclusion Criteria: * patients\>18 years * Candidate for primary total hip replacement with femoral stem and acetabular cup * if ostheoarthritis patients aged 18 to 85 years * if femoral neck fracture patients aged 18 to 90 years * patients with social security scheme * patients understands the condition of the study and is willing to partecipate for the duration of the clinical investigation * patients who gavee consent to partecipare in the clinical investigation Exclusion Criteria: * \<18 years * if female, pregnant * patient who has already had primary hip surgery on the same side * local or disseminated neoplastic disease * inability to understand the study and agree to partecipate * patients cancelling partecipation before surgery * patients under guardianship or curatorship * patients without a social security scheme * patients refusing to partecipate