AI Article Synopsis
- The study examines the effectiveness of inline dynamometry for measuring quadriceps strength after ACL reconstruction, aiming to confirm its reliability and validity.
- The research involved 50 healthy participants and 52 ACL-reconstructed individuals, measuring isometric quadriceps strength at a specific knee angle and utilizing various statistical methods to assess reliability.
- Findings indicate that inline dynamometry is a reliable and cost-effective alternative to traditional methods, making it a suitable option for post-rehabilitation assessments.
Article Abstract
Background: Quadriceps strength testing is recommended to guide rehabilitation and mitigate the risk of second injury following anterior cruciate ligament (ACL) reconstruction. Hand-held dynamometry is a practical alternative to electromechanical dynamometry but demonstrates insufficient reliability and criterion validity in healthy and ACL-reconstructed participants respectively. The purpose of this study is to investigate the reliability and concurrent validity of inline dynamometry for measuring quadriceps strength. The hypotheses are that intra-class correlation coefficient (ICC) values will be >0.90 for reliability and concurrent validity.
Methods: This was a cross sectional study using a within-participant, repeated measures design. Isometric quadriceps testing was performed at 60° knee flexion in 50 healthy and 52 ACL-reconstructed participants. Interrater reliability, intrarater reliability, and concurrent validity of inline dynamometry was investigated through calculation of ICCs, Bland-Altman analysis, linear regression, standard error of measurement (SEM) and minimal detectable change (MDC).
Results: The lower bounds of the 95% confidence intervals were >0.90 for all reliability and validity ICCs in healthy and ACL-reconstructed participants, except for intrarater reliability in healthy participants using absolute scores (ICC = 0.936 [95% CI 0.890-0.963]). In ACL-reconstructed participants, Bland-Altman bias was 0.01 Nm/kg for absolute and average scores, limits of agreement were -11.74% to 12.59% for absolute scores, the SEM was 0.13Nm/kg (95% CI 0.10-0.17) and the MDC was 0.36Nm/kg (95% CI 0.28 - 0.47).
Conclusion: Inline dynamometry is a reliable and economical alternative to electromechanical dynamometry for the assessment of quadriceps strength following ACL-reconstruction.
Clinical Trial Registration Number: ClinicalTrials.gov (NCT05109871).
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| http://dx.doi.org/10.1016/j.knee.2023.12.006 | DOI Listing |
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Inline dynamometry provides reliable measurements of quadriceps strength in healthy and ACL-reconstructed individuals and is a valid substitute for isometric electromechanical dynamometry following ACL reconstruction.
Knee
January 2024
Department of Musculoskeletal and Ageing Sciences, Institute of Life Course and Medical Sciences, Faculty of Health and Life Sciences, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, United Kingdom; MRC-Versus Arthritis Centre for Integrated Research into Musculoskeletal Ageing (CIMA), Institute of Life Course and Medical Sciences, Faculty of Health and Life Sciences, University of Liverpool, William Henry Duncan Building, 6 West Derby Street, Liverpool L7 8TX, United Kingdom.
Article Synopsis
- The study examines the effectiveness of inline dynamometry for measuring quadriceps strength after ACL reconstruction, aiming to confirm its reliability and validity.
- The research involved 50 healthy participants and 52 ACL-reconstructed individuals, measuring isometric quadriceps strength at a specific knee angle and utilizing various statistical methods to assess reliability.
- Findings indicate that inline dynamometry is a reliable and cost-effective alternative to traditional methods, making it a suitable option for post-rehabilitation assessments.
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