Responsiveness of isokinetic dynamometry in patients with osteoarthritis after knee and hip arthroplasty : a prospective repeated-measures cohort study

Prüfer, Ferdinand (author), Pavlović, Monika (author), Matko, Špela (author), Loefler, Stefan (author), Fischer, Michael J. (author), Šarabon, Nejc (author), Grote, Vincent (author)

Functional assessments are crucial for the evaluation of rehabilitation after total knee (TKA) and hip (THA) arthroplasty. Muscle strength, a key determinant of physical function (PF), is often measured with isokinetic dynamometry (ID), which is considered the gold standard. However, studies lack evaluations of responsiveness—the ability to detect changes over time. This study aims to determine the responsiveness of ID in measuring PF in TKA and THA rehabilitation—is muscle strength a valid indicator for assessing improvement in rehabilitation processes? The pre- and post-surgery PF of 20 osteoarthritis patients (age 55–82) was assessed, using ID, performance-based and self-reported measures. Responsiveness was evaluated by comparing the observed relationship of changes in ID and PF scores with the a priori defined expected relationship of change scores. While the performance-based and self-reported measures showed significant improvements post-surgery (Cohen’s d [0.42, 1.05] p < 0.05), ID showed no significant differences. Moderate correlations were found between changes in some ID parameters and selected functional tests (r ≈|0.5|, p < 0.05). Responsiveness was solely found for the peak torque of knee extension at 180°/s on the operated side. Responsiveness is an often-overlooked psychometric property of outcome measurements. The findings suggest that ID may not be fully responsive to the construct of PF after TKA and THA, raising questions about its role and usefulness in this context and the need for more appropriate assessment methods.

• Language: English
• Keywords: arthroplasty, replacement hip, replacement knee, muscle strength, physical functional performance, rehabilitation, responsiveness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: ZF - Faculty of Health Sciences
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: 18 str.
• Numbering: Vol. 12, issue 3, art. 314
• PID: 20.500.12556/RUL-154225-733eac2c-a2b2-383e-8b43-b7a4c73e832c
• UDC: 615.82/.84:617.3
• ISSN on article: 2227-9032
• DOI: 10.3390/healthcare12030314
• COBISS.SI-ID: 183481347
• Publication date in RUL: 02.02.2024

Record is a part of a journal

• Title: Healthcare
• Shortened title: Healthcare
• Publisher: MDPI AG
• ISSN: 2227-9032
• COBISS.SI-ID: 520110873

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 25.01.2024

Secondary language

• Language: Slovenian
• Keywords: artroplastika, zamenjava kolka, zamenjava kolena, mišična moč, fizična funkcionalna zmogljivost, rehabilitacija, odzivnost

Projects

• Funder: ARIS - Slovenian Research and Innovation Agency
• Project number: P5-0443-2022
• Name: Kineziologija za učinkovitost in preventivo mišično-skeletnih poškodb v športu

• Funder: Other - Other funder or multiple funders
• Funding programme: European Regional Development Fund
• Project number: 05011AXY3
• Name: Ambulante Remobilisation nach Knie und Hüfttotalendoprothesen
• Acronym: AMB-REMOB