TKA with a retained patella yielded low patellar fracture rates
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Patellar fracture after total knee arthroplasty with a retained patella is uncommon and may provide better clinicoradiological results than total knee arthroplasty with a resurfaced patella, according to published results.
To determine incidence rates of patellar fracture after primary TKA, researchers from Asan Medical Center at the University of Ulsan College of Medicine in South Korea retrospectively analyzed 2,883 consecutive TKAs with patellar retention from 2005 to 2019. According to the study, researchers compared treatment outcomes, including Hospital for Special Surgery (HSS) knee scores, union rates and complications, between the retained patella TKA group that sustained fractures and non-patella fracture controls.
Overall, the researchers found a 1.11% incidence of patellar fracture (n = 32) in the retained patella group with “relatively improved clinicoradiological results over those of patellar fracture after TKA with resurfaced patella reported in the literature,” they wrote in the study.
Nonunion was reported in three of the 32 cases with fractures and HSS scores at final follow-up “increased significantly” from preoperative scores.
While the decision to resurface or to retain the patella is controversial, according to the authors, these results offer evidence to support TKA with patella retention, they noted.
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