LAUSR

OBJECTIVE To determine the multicenter outcomes of the cementless, hydroxyapatite on the porous, long-stem prosthesis for revision total hip arthroplasty (THA) at multiple centres. STUDY DESIGN Observational study. PLACE AND DURATION OF STUDY Lanzhou University Second Hospital, Gansu Province People's Hospital, New City District of Jiuquan People's Hospital, from March 2014 to December 2019. METHODOLOGY The database in three centres was retrospectively reviewed hip arthroplasty during the study period. Patients who underwent revision THA using the cementless, hydroxyapatite on porous, long-stem femoral prostheses were included. Perioperative complications, functional outcomes including the Merle d'Aubign ́e-Postel hip questionnaire (MAP), Harris Hip Score (HHS), Oxford Hip Score (OHS), Western Ontario and McMaster Universities (WOMAC) Osteoarthritis Index, life independence, and patient satisfaction were analyzed, the radiographic evaluation was also performed. RESULTS Fifty revision THA (50 hips) were included for analysis, the median interval between primary and index revision procedure was 5.1 (0.3-30) years, and the rate of perioperative complications was 18%. Patients were followed up for a mean of 3.1±1.5 (1.1-6.5) years. At the latest follow-up, the functional outcomes significantly increased compared to preoperative data (p<0.001). Thirty-nine patients (92.9%) were life-independent, and 36 patients (85.7%) were satisfied with the surgery. Subsidence was observed in 5 patients, osteolysis occurred in 3 patients, and no revision was required. CONCLUSION The cementless, hydroxyapatite on porous, long-stem prosthesis was a good choice for revision THA with a poor bone condition in the proximal femur, unstable PFF, and recurrent dislocations after THA, no severe complications were found. KEY WORDS Arthroplasty, Hip, Reoperation, Hip prosthesis.