Mid-term Outcomes of Medial Metal Backed and All-polyethylene Unicompartmental Knee Arthroplasty in Obese Patients: a Retrospective Propensity-matched Analysis

Overview

Journal J Orthop Surg Res

Publisher Biomed Central

Specialty Orthopedics

Date 2024 Oct 14

PMID 39402592

Authors

Luca De Berardinis

Gianluca Piovan

Daniele Screpis

Marco Senarighi

Marco Baldini

Lorenzo Povegliano

Antonio Pompilio Gigante

Claudio Zorzi

Affiliations

Soon will be listed here.

Abstract

Background: This retrospective study compares the outcomes of unicompartmental medial fixed-bearing knee arthroplasty (mUKA), involving a cemented metal-backed (MB) or an all-polyethylene (AP) tibial component, performed in obese patients with a body mass index (BMI) > 30 with a follow-up of at least 5 years.

Methods: The institutional database was mined for primary mUKAs involving an MB or an AP tibial component (MB-UKA and AP-UKA groups, respectively) performed from January 2015 to August 2019. Patient demographics and patient-reported outcome measures (PROMs) were compared and a propensity score matching (PSM) analysis (1:1) using multiple variables was conducted.

Results: PSM analysis yielded 37 pairs of obese MB-UKA and AP-UKA patients. At 5 years, the Knee Society Function Score (KSFS) was 75.1 ± 10.6 in MB-UKA and 79.4 ± 9.1 in AP-UKA patients (p = 0.029), and the Oxford Knee Score (OKS) was 38.1 ± 4.4 in MB-UKA and 40.6 ± 5.7 in AP-UKA patients (p = 0.011).

Conclusion: At five-year follow-up, in a matched group of obese MB-UKA and AP-UKA patients, the AP-UKA group achieved better KSFSs and OKSs. Both the AP and the MB tibial components were able to bring about a significant improvement of the most widely used PROMs.

Citing Articles

Obesity and hyperlipidemia were associated with more severe synovitis and structural abnormalities as well as inferior functional outcomes in knee osteoarthritis: a retrospective comparative study.

Hao K, Wang J, Niu Y, Wang F J Orthop Surg Res. 2024; 19(1):845.

PMID: 39696586 PMC: 11657670. DOI: 10.1186/s13018-024-05326-2.

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