Patients
rheumatoid arthritis, hip disorder, THA
RHEUMATOID ARTHRITIS, OSTEOARTHRITIS, JOINT DISEASES, AVASCULAR NECROSIS, DISEASES
This was a multicentre, open-label, single-arm clinical trial. The Clinical Research Ethics Committee of Tohoku University Hospital approved the study protocol (approval no.: #201,506–1). The current clinical trial ID is ISRCTN21241251. Informed consent was obtained from all patients undergoing THA from April 2016 to September 2017. Patients awaiting unilateral THA were included in this trial and enrolled in the TNS group. Inclusion criteria were age over 20 years and a diagnosis of osteoarthritis, avascular necrosis, or rheumatoid arthritis. Exclusion criteria were the previous operation of the affected side of the hip (THA, osteotomy, or tenotomy around the hip joint), bilateral hip disorder, rheumatoid arthritis of Charnley category C (multiple joint diseases or other diseases limiting mobility) [