• Arch Orthop Trauma Surg · Mar 2024

    Clinical Trial

    Change in patellar height in medial and lateral unicompartmental knee arthroplasty: a clinical trial.

    • Riccardo D'Ambrosi, Francesco Rubino, Chiara Ursino, Ilaria Mariani, Nicola Ursino, Matteo Formica, Julia Prinz, and Filippo Migliorini.
    • IRCCS Ospedale Galeazzi Sant'Ambrogio, Milan, Italy.
    • Arch Orthop Trauma Surg. 2024 Mar 1; 144 (3): 134513521345-1352.

    IntroductionEvidence on patellar height changes following unicompartmental knee arthroplasty (UKA) is lacking. Therefore, this study compared the patella height in patients who underwent medial versus lateral UKA. Moreover, a subgroup analysis was conducted to investigate whether sex, age, and BMI of the patients exert an influence on the postoperative patellar height.MethodsRadiographs and hospital records of patients undergoing UKA were prospectively collected. Surgeries were performed by one author with long experience in UKA in a highly standardised fashion. The implants were fixed-bearing medial PPK (Zimmer Biomet, Warsaw, Indiana, USA) and fixed-bearing lateral ZUK (Lima Corporate, Udine, Italy). The patellar height was measured using the Insall-Salvati and Caton-Deschamps indices.ResultsA total of 203 patients were included: 119 patients were included in the medial and 84 in the lateral UKA. The mean age of the patients was 68.9 ± 6.7 years, and the mean BMI was 28.1 ± 4.1 kg/m2. 54% (110 of 203 patients) were women. On admission, between-group comparability was found in age, BMI, sex, and length of the follow-up. No between-group and within-group difference was detected pre- and post-operatively in the Insall-Salvati and Caton-Deschamps indices in patients who have undergone medial versus lateral UKA. Concerning the subgroup analyses, no between-group and within-group difference was detected pre- and post-operatively in all comparisons according to sex, age, and BMI.ConclusionNo difference was found in patella height in patients who have undergone medial compared to lateral UKA. Furthermore, there was no evidence of an association between patient characteristics (sex, age, BMI) and patella height between medial and lateral UKA.© 2023. The Author(s).

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