Affiliation:
1. Department of Orthopedic Surgery Ajou University Medical Center Suwon South Korea
2. Department of Orthopedic Surgery The Affiliated Suqian First People's Hospital of Nanjing Medical University Suqian China
3. Department of Orthopedic Surgery Konyang University Hospital Daejeon South Korea
Abstract
AbstractPurposeThere have been insufficient data regarding the long‐term results of unrestricted kinematically aligned total knee arthroplasty (unKATKA) in Asian patients. We investigated mid‐ to long‐term clinical and radiological follow‐up data of Korean patients after caliper‐verified unKATKA of minimum 7.4–10 years including categorised data of postoperative tibial component, limb and knee alignment. Additionally, we analysed the preoperative distribution and postoperative restoration of coronal plane alignment of knee (CPAK) phenotypes.MethodsThis study is a retrospective analysis of 63 patients: 96 osteoarthritic underwent consecutive caliper‐verified unKATKA between October 2013 and May 2016 by a single surgeon. Implant survivorship was investigated for revision for any reason. Each knee was categorised into an in‐range or outlier group by three postoperative alignment parameters: tibial component, knee and limb alignment. Statistical analyses were done for any significant differences in clinical scores and implant survival rates between groups. Finally, all knees were classified into CPAK classification postoperatively and postoperatively. The CPAK restoration rate was calculated.ResultsAmong 85 knees in the clinically confirmed group, implant survival was 98.8%. There was one case of revision due to periprosthetic fracture. The percentage postoperatively aligned in the varus (valgus) outlier range was 100% (0%) for tibial component, 16.7% (24.8%) for the knee alignment and 51% (0%) for the limb alignment. All three categories did not affect implant survival or clinical scores. Eighty one out of 96 knees (84.4%) were restored to their CPAK phenotype postoperatively.ConclusionWith the limitation of a case series having a small number of patients and gender deviation, our study suggests that caliper‐verified unKATKA could be a good option regardless of geographical variation of constitutional alignment in patients with osteoarthritis (OA).Level of EvidenceLevel IV, therapeutic study.