Physical therapy in sport : official journal of the Association of Chartered Physiotherapists in Sports Medicine · 2026
A novel clinic-friendly test protocol to assess quadriceps strength symmetry after anterior cruciate ligament reconstruction.
СтатьяВалидационное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Sundberg Axel, Högberg Johan, Hamrin Senorski Rebecca, Piussi Ramana, Samuelsson Kristian, Thomeé Roland, Hamrin Senorski Eric
Аннотация
OBJECTIVES: To evaluate the reliability and validity of a clinic-friendly protocol using a weight-based knee extension (WBKE) machine to assess quadriceps symmetry after anterior cruciate ligament (ACL) reconstruction, compared to isokinetic dynamometry (IKD).
DESIGN: Cross-sectional reliability and validity study.
SETTING: Orthopedic rehabilitation and sports medicine clinic.
PARTICIPANTS: Seventy-four individuals (aged 16-50 years) between 6 and 14 months post-ACL reconstruction.
MAIN OUTCOME MEASURES: Test-retest reliability (intraclass correlation coefficients, ICC) and validity (limb symmetry index, Pearson's correlation, linear regression, Bland-Altman analysis) of WBKE compared to IKD.
RESULTS: The WBKE test showed excellent test-retest reliability (ICC = 0.94-0.98). The limb symmetry index was 90.6% ± 12.4% for IKD and 87.5% ± 12.5% for WBKE, with a mean difference of -3.16% (95% CI: -4.8 to -1.5, p < 0.001). Bland-Altman analysis indicated 95% limits of agreement from 8.31% to -14.63%. The correlation between WBKE and IKD was strong (r = 0.89, 95% CI: 0.81-0.94, p < 0.001), supported by linear regression (R2 = 0.79, p < 0.001).
CONCLUSIONS: The WBKE test demonstrated excellent reliability and strong validity for assessing quadriceps symmetry post-ACL reconstruction. It offers a practical, accessible alternative to isokinetic testing for monitoring strength recovery in clinical practice.
DESIGN: Cross-sectional reliability and validity study.
SETTING: Orthopedic rehabilitation and sports medicine clinic.
PARTICIPANTS: Seventy-four individuals (aged 16-50 years) between 6 and 14 months post-ACL reconstruction.
MAIN OUTCOME MEASURES: Test-retest reliability (intraclass correlation coefficients, ICC) and validity (limb symmetry index, Pearson's correlation, linear regression, Bland-Altman analysis) of WBKE compared to IKD.
RESULTS: The WBKE test showed excellent test-retest reliability (ICC = 0.94-0.98). The limb symmetry index was 90.6% ± 12.4% for IKD and 87.5% ± 12.5% for WBKE, with a mean difference of -3.16% (95% CI: -4.8 to -1.5, p < 0.001). Bland-Altman analysis indicated 95% limits of agreement from 8.31% to -14.63%. The correlation between WBKE and IKD was strong (r = 0.89, 95% CI: 0.81-0.94, p < 0.001), supported by linear regression (R2 = 0.79, p < 0.001).
CONCLUSIONS: The WBKE test demonstrated excellent reliability and strong validity for assessing quadriceps symmetry post-ACL reconstruction. It offers a practical, accessible alternative to isokinetic testing for monitoring strength recovery in clinical practice.