ArticleJournal of physical therapy science2025
Reliability and validity of a low-cost luggage scale for hip external rotation strength measurements.
Article in Journal of physical therapy science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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4 authors.
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Abstract
[Purpose] The purpose of this study was to determine the intra- and inter-rater reliability of strength testing of the hip external rotators using a dynamometer and a luggage scale. Furthermore, the secondary purpose was to examine the validity of the luggage scale when compared to the dynamometer. [Participants and Methods] Twenty-two participants were strength tested bilaterally (n=44). Hip external rotation strength was tested using a Lafayette handheld dynamometer (HHD) and an analog luggage scale (LS) with the participant prone with their knee flexed to 90 degrees and hip maintained in neutral. [Results] The results indicated good to excellent intra-rater reliability for the HHD (ICC=0.921, 95% CI=0.864, 0.99, ICC=0.886, 95% CI=0.772, 0.923) and excellent intra-rater reliability for the LS (ICC=0.971, 95% CI=0.948, 0.984, ICC=0.926, 95% CI=0.871, 0.958) for each examiner. Inter-rater reliability was good for the HHD (ICC=0.891, 95% CI=0.837, 0.927) and excellent for the LS (ICC=0.938, 95% CI=0.907, 0.958). Strong correlations were found between the HHD and LS by both examiners (r=0.869, r=0.750, respectively). [Conclusion] Both an HHD and LS are reliable for measuring hip ER strength. The luggage scale is a valid, cost-effective means for reliable measurement of hip ER strength.
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