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BioMed Research International
Volume 2017 (2017), Article ID 5836025, 9 pages
Clinical Study

Postural Stability after Unicondylar Knee Arthroplasty and Patient-Specific Interpositional Knee Spacer

Department of Orthopaedic Surgery, Regensburg University Hospital, Regensburg, Germany

Correspondence should be addressed to J. Goetz

Received 9 November 2016; Accepted 12 June 2017; Published 13 July 2017

Academic Editor: Milena Fini

Copyright © 2017 J. Goetz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Purpose and Hypothesis. Knee osteoarthritis results, inter alia, in decreased postural stability. After arthroplasty, postural stability recovers, but it is unclear whether this can be ascribed to a reduction of pain or to the preserving of receptor-rich intraarticular soft tissue and natural knee kinematics. The objective of this study was to evaluate whether an unicondylar knee arthroplasty provides better results regarding postural stability or a patient-specific knee spacer. Methods. In this comparative study, we assessed functional results and postural stability 16 months after 20 unicondylar knee arthroplasties (group A) and 20 patient-specific interpositional knee device implantations (group B). Patients were evaluated using the KSS and WOMAC score. Postural stability was analysed during single leg stance on a force platform (Biodex Balance System). Results. Concerning postural stability, range of motion (ROM), and KSS 16 months after the procedure, there were no significant differences between both groups. Conclusion. Successful treatment of knee osteoarthritis restores postural stability to the level of the contralateral side, regardless of the implant device.