264AN ANALYSIS OF THE EFFECTS OF METAL-ON-POLYETHYLENE BEARING SURFACES ON THE WEIGHT BEARING PERFORMANCE OF TOTAL HIP REPLACEMENTSPrimary total hip replacement (THA) is still a contentious technique. This is mostly caused by the decision to use metal-on-polyethylene (MOP) or ceramic-on-ceramic (COC) implants. This study's goal was to assess the dependability and durability of COC and MOP bearing surfaces used in total hip arthroplasty. Methods: With the aid of prospective randomized controlled trials (RCTs) found through investigations, the results of ceramic-on-ceramic implants were compared to those of metal-on-polyethylene implants. Two researchers separately followed out all the tasks of sample selection, data extraction, and bias evaluation. Researchers pooled risk levels and weighted mean differences using random-effect or fixedeffect models based on the heterogeneity of the selected research. Results: Nine hundred and eighty hips were included in 6 RCTs. In comparison with metal-on-polyethylene porcelain implants, ceramic-on-ceramic implants significantly reduced revisions, osteolysis, radiolucent lines, aseptic loosening, and dislocations, and increased squeaking and intraoperative implant fractures. There was no discernible distinction between the two populations in terms of hip functioning, deep inflammation, or heterotopic ossification. Conclusions: In general, despite more squeaking and fractures during surgery, COC bearing surfaces perform better than metal-on-polyethylene when it comes to revision, osteolysis and radiolucent line formation, aseptic loosening, and dislocation.Krishna@gmail.comResearch1122021Total hip arthroplasty,osteolysis,Bearing surface,heterotopic ossificationDr. Sai Krishna K,Dr. BheeshmaAssistant Professor, Sri Lakshminarayana Institute of Medical Sciences, Villianur, Puducherry, India.,Assistant Professor, Indira medical college and Hospital, Pandur, TamilNadu, India.