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

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. . 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). Concerning postural stability, range of motion (ROM), and KSS 16 months after the procedure, there were no significant differences between both groups. . Successful treatment of knee osteoarthritis restores postural stability to the level of the contralateral side, regardless of the implant device.