J Knee Surg 2022; 35(10): 1126-1131
DOI: 10.1055/s-0040-1722321
Original Article

The Value of a Standardized Knee Functional Assessment in Predicting the Outcomes of Total Knee Arthroplasty

1   Departament of Health Care, Rehabilitation Center of the Clinics Hospital, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil
,
Rodrigo Salim
2   Department of Orthopaedics and Anaesthesiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil
,
2   Department of Orthopaedics and Anaesthesiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil
,
Luciano Fonseca Lemos de Oliveira
1   Departament of Health Care, Rehabilitation Center of the Clinics Hospital, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil
,
Marcelo Riberto
2   Department of Orthopaedics and Anaesthesiology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil
,
Mauricio Kfuri
3   Departament of Orthopaedic Surgery, University of Missouri, Columbia, Missouri
› Author Affiliations

Abstract

Questionnaires and physical tests are tools to determine the ability of an individual to perform tasks of the daily living. In our institution, a standardized knee performance evaluation including patient-reported outcome measures (PROMs) and physical performance tests has been applied to all patients undergoing total knee arthroplasty (TKA). Our goal was to identify which preoperative tools influence the outcomes of a TKA and if physical performance tests can be of value if used along with PROMs in predicting functional outcomes. Classification and regression tree was used to analyze which preoperative factors influence function after TKA. Western Ontario and McMaster Universities Arthritis Index (WOMAC) function (WOMAC-F), 6-minute walk test (6MWT), and timed up and go (TUG) test at the 12th postoperative month were the dependent variables. Age, body mass index, preoperative WOMAC function and pain score, muscle strength, 6MWT, and TUG test score were used as preoperative predictors of dependent variables. TUG ≤19.3 seconds and age <62 years were preoperative predictors of better scores in the WOMAC-F (5.5). Strength of extensor muscles of the nonoperated knee ≥99.43 N·m/kg and 6MWT> 328 m were preoperative predictors of a better postoperative 6MWT (499 m). TUG <12.3 seconds and 6MWT ≥421 m were preoperative predictors of better postoperative TUG (7.3 seconds). Preoperative performance in physical tests had an influence on postoperative outcome scores than PROMs after TKA. Less age, good muscular strength, greater capacity of walking, and smaller TUG times were associated with better outcomes.

Ethical Approval

The study protocol was approved by the Medical Ethics Committee of the Clinics Hospital at Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Sao Paulo, Brazil.




Publication History

Received: 07 November 2019

Accepted: 12 November 2020

Article published online:
28 January 2021

© 2021. Thieme. All rights reserved.

Thieme Medical Publishers, Inc.
333 Seventh Avenue, 18th Floor, New York, NY 10001, USA

 
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