Background. Indication for rotating hinge (RH) total knee arthroplasty (TKA) includes primary and revision cases, with\ncontradictory results. The aimof this study was to report prospective early results of a new modular rotating hinge TKA (EnduRo).\nFor this implant several new design features and a new bearing material (carbon-fiber reinforced poly-ether-ether-ketone) have\nbeen developed. Furthermore, we tried to establish a new classification of failure modes for revision TKA. Methods. 152EnduRo\nrotating-hinge prostheses were implanted in two centers. In 90 patients a primary implantation has been performed and 62 patients\nwere revision cases. Knee Society Score (KSS), Western Ontario and McMaster Osteoarthritis Index (WOMAC), Oxford Knee\nScore (OKS), and Range of motion (ROM) were assessed before surgery, 3 months postoperatively, 12 months postoperatively, and\nannually thereafter. We defined 3 types of complications: Type 1, infection; type 2, periprosthetic complications; type 3, implant\nfailures. Results. KSS, WOMAC, OKS, and ROM revealed significant improvements between the preoperative and the follow-up\ninvestigations. There were 14 complications (9.2%) leading to revision surgery, predominantly type 2. Conclusion. Our study shows\nexcellent clinical results of the EnduRo TKA. Furthermore, no premature material failure or unusual biological response to the new\nbearing material could be detected.
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