ArticleArthroplasty today2026
Switching From a 6° to a 20° Valgus Prosthetic Trochlear Groove Improved the Forgotten Joint and Oxford Knee Scores After Kinematically Aligned Total Knee Arthroplasty.
Article in Arthroplasty today, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: In kinematically aligned (KA) total knee arthroplasty (TKA) using a femoral component with the traditional 6° valgus prosthetic trochlear groove (PTG), patients reported a lower Forgotten Joint Score (FJS) when the quadriceps line of pull was laterally misaligned to the groove, with an incidence of 89%. It remains unclear whether switching to a KA-optimized femoral component with a 20° valgus PTG, which properly aligns the quadriceps line of pull, can improve the FJS and the Oxford Knee Score (OKS). Methods: The analysis of single-surgeon series of KA TKAs included 145 cases with a KA-optimized 20° valgus PTG and 292 cases with a 6° valgus PTG. Each participant reported their FJS and OKS at 2 years and underwent a postoperative coronal long-leg scan. Results: The 20° group had a 6-point higher FJS (79) and a 16% lower incidence of poor FJS (<40) (8%) compared to the 6° group. Additionally, 73% and 22% achieved an excellent (48-42) or good (41-34) OKS, compared to 64% and 20% with a 6° valgus PTG. The FJS in the 20° group was 7 and 20 points higher in the coronal plane alignment of the knee (CPAK) types 2 and 3. Conclusions: Surgeons performing KA TKA should consider switching to a KA-optimized femoral component with a 20° valgus PTG, as this option improves the FJS and OKS, lowers the risk of a poor FJS, and is especially useful for CPAK 2 and 3, with no apparent disadvantages in CPAK 1, 4, and 5. Level of Evidence: III.
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