Ankylosing spondylitis and rheumatoid arthritis are the most common chronic inflammatory rheumatism. Their localization at the level of the hip stresses severely the functional prognosis. We report a retrospective series of 40 total hip prostheses performed in 32 patients with inflammatory coxitis, collected in the Traumatology and Orthopedics Department at the Mohammed V Military Hospital in Rabat between 2008 and 2016. The average age at the time of the intervention was 42 years with a clear male predominance. All patients were followed in consultation with a clinical and paraclinical examination. Coxitis following ankylosing spondylitis is the most frequently encountered in our series (65.6%). The rating of Postel Merle d'Aubigné was used to assess the functional status of the hip before and after surgery. The total hip prosthesis was cementless in 37 cases and cemented in 03 cases. The clinical results for the 32 patients after a mean follow-up of 04 years were very satisfactory in (88%) of the cases. The objective of this study is to evaluate our functional results and to show the interest of total hip arthroplasty in this type of pathology, in order to improve the quality of life of these often young patients