Kinematic predictors of single-leg squat performance: a comparison of experienced physiotherapists and student physiotherapists
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BACKGROUND: The single-leg squat (SLS) is a common test used by clinicians for the musculoskeletal assessment of the lower limb. The aim of the current study was to reveal the kinematic parameters used by experienced and inexperienced clinicians to determine SLS performance and establish reliability of such assessment. METHODS: Twenty-two healthy, young adults (23.8 ± 3.1 years) performed three SLSs on each leg whilst being videoed. Three-dimensional data for the hip and knee was recorded using a 10-camera optical motion analysis system (Vicon, Oxford, UK). SLS performance was rated from video data using a 10-point ordinal scale by experienced musculoskeletal physiotherapists and student physiotherapists. All ratings were undertaken a second time at least two weeks after the first by the same raters. Stepwise multiple regression analysis was performed to determine kinematic predictors of SLS performance scores and inter- and intra-rater reliability were determined using a two-way mixed model to generate intra-class correlation coefficients (ICC3,1) of consistency. RESULTS: One SLS per leg for each participant was used for analysis, providing 44 SLSs in total. Eight experienced physiotherapists and eight physiotherapy students agreed to rate each SLS. Variance in physiotherapist scores was predicted by peak knee flexion, knee medio-lateral displacement, and peak hip adduction (R2 = 0.64, p = 0.01), while variance in student scores was predicted only by peak knee flexion, and knee medio-lateral displacement (R2 = 0.57, p = 0.01). Inter-rater reliability was good for physiotherapists (ICC3,1 = 0.71) and students (ICC3,1 = 0.60), whilst intra-rater reliability was excellent for physiotherapists (ICC3,1 = 0.81) and good for students (ICC3,1 = 0.71). CONCLUSION: Physiotherapists and students are both capable of reliable assessment of SLS performance. Physiotherapist assessments, however, bear stronger relationships to lower limb kinematics and are more sensitive to hip joint motion than student assessments.
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Squat depth was not standardized.
“Commensurate with previous investigations, 1,11-13 and to most closely resemble clinical practice, squat depth was not standardized.”
From Lower-Limb Kinematics of Single-Leg Squat Performance in Young Adults (2014) · cites this paper as [13]
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- Authors
- Weeks, B. K., Carty, C. P., & Horan, S. A.
- Affiliations
- Griffith University (AU)
- Corresponding author
- Weeks, Benjamin K
- Venue
- BMC Musculoskeletal Disorders
- Published
- 2012-10-25
- Volume
- 13
- Issue
- 1
- Pages
- 207-207
- ISSN
- 1471-2474 (ISSN-L)
- PMC
- PMC3517427
- OpenAlex
- W2124545180
- Semantic Scholar
- a4c64e4cfab03e331802ec53ae0faacda28e67c5
- Cited by
- 80
- References
- 35
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 14 · 2020: 8 · 2019: 7 · 2018: 9 · 2017: 5 · 2016: 4 · 2015: 7 · 2014: 6 · 2013: 1
- FWCI
- 2.55
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- BMC Musculoskeletal Disorders (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Griffith Research Online (submittedVersion, cc-by)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Lower Extremity Biomechanics and Pathologies
- Health Sciences › Medicine › Surgery › Knee injuries and reconstruction techniques
- Social Sciences › Decision Sciences › Statistics, Probability and Uncertainty › Reliability and Agreement in Measurement
- Keywords
- single-leg squat, lower limb kinematics, physiotherapy assessment, inter-rater reliability, intra-rater reliability, hip adduction, hip joint motion, musculoskeletal assessment
- MeSH terms
- Adult, Biomechanical Phenomena, Cross-Sectional Studies, Female, Hip Joint, Humans, Knee Joint, Male, Predictive Value of Tests, Students, Reproducibility of Results, Physical Therapy Modalities, Athletic Performance, Young Adult, Physical Therapists
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