Description
Purpose: To investigate the correlation between postoperative limb/component alignments and clinical/functional outcomes following medial unicondylar knee arthroplasty (mUKA).
Methods: Inclusion criteria included peer-reviewed English- or German-language publications assessing postoperative limb or implant alignment and clinical outcomes of mUKA. Methodological Index for Non-Randomized Studies (MINORS) was used to assess article quality.
Results: A total of 2767 knees from 2604 patients were evaluated. 1-4° HKA group had better WOMAC. Varus HKA alignments were however associated with lower OKS scores, while the 0° to -2.5° tibiofemoral angle (TFA) group showed superior KSS scores. For the tibia component coronal angle (TCCA), most authors identified the -2.5° to 5° range as associated with the best clinical and functional outcomes
Conclusions: Optimal outcomes in mUKA were associated with a 1°-4° coronal limb alignment. The tibia implant component performed well within a -2.5° to 5° alignment range. An external rotation of 4°-5° was recommended for the tibia component, while internal rotation correlated negatively with the femoral component.
