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Improvements in TKA implant design linked with decreased incidence of lateral release
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Recently published results showed newer total knee implant designs led to a decrease in the incidence of lateral release to balance the patellofemoral joint.
To determine whether design changes have improved patellar stability, researchers evaluated the use of lateral release in the Press-Fit Condylar, the Sigma and the Attune (DePuy) implants among 1,991 primary total knee arthroplasties (TKAs) performed from 1980 to 2015. Adjusting for age, sex, preoperative alignment and bearing type, researchers used multivariate analysis to determine the association between implant type and lateral release.
Results showed lateral release was performed in 23% of all cases, with a 6.35 and 2.02 increased adjusted odds of having a lateral release with the Press-Fit Condylar and Sigma implants, respectively, vs. the Attune implant. Compared with patients aged 75 years or older, researchers found increased odds of lateral release in all other age groups, especially among patients aged 19 years to 55 years. Researchers also noted a 1.71 increased adjusted odds of having a lateral release among women, as well as a 3.43 increased odds of having a lateral release between valgus knees and varus knees. Adjusting for other covariates, results showed a 1.80 increased odds of lateral release in the Sigma fixed bearing implants vs. the Sigma rotating platform implants. – by Casey Tingle
Disclosures: Webb reports no relevant financial disclosures. Please see the full study for a list of all other authors’ relevant financial disclosures.
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