Purpose The purpose of this multicentre prospective randomized controlled trial was to compare the survival rate and clinical outcome in total knee arthroplasty (TKA) after MRI-based patient-specific instruments (PSI) and conventional instruments 5 years after initial surgery. Methods At a mean follow-up of 5.1 years (0.4), 163 patients (90.6%) with a mean age of 71.8 years (8.7) were analysed. A survival analysis with revision of the TKA as endpoint was performed. The Knee Society Score (KSS), evaluations on plain radiographs and patient-reported outcome measures (PROMs) were obtained preoperatively and at each FU. Results At final follow-up, one TKA in the PSI- (1.2%) and 3 TKAs in the conventional group (3.8%) had undergone revi- sion surgery (n.s.). No radiological abnormalities were noted at any time point. Postoperatively, the KSS and PROMs sig- nificantly improved within each group compared with the preoperative values. There were no clinically relevant differences for the KSS [PSI: 77.4, 9.8 (95% CI 75.0–79.7) vs. conventional: 77.3 10.5 (95% CI 74.9–79.8)] and the PROMs between both groups (n.s.) at 5 years follow-up. Conclusion There is still a lack of reliable data on the survival of TKA and clinical evidence, when using PSI for TKA. Longer follow-up studies
Knee Surgery, Sports Traumatology, Arthroscopy – Springer Journals
Published: May 3, 2018
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