| Summary: | The arthroscopic surgical procedures reported previously for a rheumatic hip joint have been primarily performed as diagnostic procedures. Only a few studies have reported the success of arthroscopic surgery in hip joint preservation. We encountered a special case in which joint remodeling was seen in a patient with rheumatoid arthritis treated with biological drugs after hip arthroscopic synovectomy and labral repair. We report the case of a 39-year-old woman with rheumatism, which was controlled with tocilizumab, prednisolone, and tacrolimus. The hip joint showed Larsen grade 3 destruction, and the Harris Hip Score was 55 points. Because of the patient's strong desire to undergo a hip preservation operation, we performed hip arthroscopic synovectomy and repair of a longitudinal labral tear. After 2.5 years, the joint space had undergone rebuilding with improvement to Larsen grade 2, and the Harris Hip Score had improved to 78 points; the patient was able to return to work with the use of 1 crutch. It is possible to perform hip arthroscopic surgery for rheumatoid arthritis with a hip preservation operation with biological drugs.
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