Аннотация
Rheumatoid arthritis is an autoimmune systemic disease that affects the joints and is often disabling. Most often, a positive effect in improving the quality of life can only be achieved through joint replacement. The increase in the prevalence of the use of the prosthetic method in the last 40 years has put forward the problem of replacing a failed endoprosthesis with a leading position in terms of complexity in the field of orthopedic surgery.The purpose of this message: To evaluate the results of treatment of a patient with instability of the acetabular component of the hip joint endoprosthesis with concomitant rheumatoid arthritis.As a clinical example, we present the case of the treatment of patient M., 48 years old. Rheumatoid arthritis, seropositive, ACCP positive, late stage, activity I, R st. II. FC II. Vitamin D deficiency, generalized osteoporosis, mixed genesis (autoimmune, steroid, postmenopausal). There is a concomitant pathology: Arterial hypertension of the first degree, P 1.At the follow-up examination in February 2023, the patient notes complete painlessness in the area of the left hip joint at rest and during movement. Range of motion in the left hip joint flexion 90 abduction 30 extension 185. In general, the patient is adapted to social conditions and notes the overall positive effect of the surgical intervention.Conclusions: In this clinical case, the causes of aseptic instability were poor-quality components of the endoprosthesis during primary prosthetics, concomitant rheumatoid arthritis, the young age of the patient, which caused rapid wear of the endoprosthesis in the friction node and, as a result, bone resorption.Keywords: hip arthroplasty, revision arthroplasty, instability of the acetabular component, bone allograft, Marburg system.