Validity and inter-rater reliability of medio-lateral knee motion observed during a single-limb mini squatReportar como inadecuado

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BMC Musculoskeletal Disorders

, 11:265

Orthopedics and biomechanics


BackgroundMuscle function may influence the risk of knee injury and outcomes following injury. Clinical tests, such as a single-limb mini squat, resemble conditions of daily life and are easy to administer. Fewer squats per 30 seconds indicate poorer function. However, the quality of movement, such as the medio-lateral knee motion may also be important. The aim was to validate an observational clinical test of assessing the medio-lateral knee motion, using a three-dimensional 3-D motion analysis system. In addition, the inter-rater reliability was evaluated.

MethodsTwenty-five 17 women non-injured participants mean age 25.6 years, range 18-37 were included. Visual analysis of the medio-lateral knee motion, scored as knee-over-foot or knee-medial-to-foot by two raters, and 3-D kinematic data were collected simultaneously during a single-limb mini squat. Frontal plane 2-D peak tibial, thigh, and knee varus-valgus angles, and 3-D peak hip internal-external rotation, and knee varus-valgus angles were calculated.

ResultsTen subjects were scored as having a knee-medial-to-foot position and 15 subjects a knee-over-foot position assessed by visual inspection. In 2-D, the peak tibial angle mean 89.0 SE 0.7 vs mean 86.3 SE 0.4 degrees, p = 0.001 and peak thigh angle mean 77.4 SE 1.0 vs mean 81.2 SE 0.5 degrees, p = 0.001 with respect to the horizontal, indicated that the knee was more medially placed than the ankle and thigh, respectively. Thus, the knee was in more valgus mean 11.6 SE 1.5 vs 5.0 SE 0.8 degrees, p < 0.001 in subjects with the knee-medial-to-foot than in those with a knee-over-foot position. In 3-D, the hip was more internally rotated in those with a knee-medial-to-foot than in those with a knee-over-foot position mean 10.6 SE 2.1 vs 4.8 SE 1.8 degrees, p = 0.049, but there was no difference in knee valgus mean 6.1 SE 1.8 vs mean 5.0 SE 1.2 degrees, p = 0.589. The kappa value and percent agreement, respectively, was >0.90 and 96 between raters.

ConclusionsMedio-lateral motion of the knee can reliably be assessed during a single-leg mini-squat. The test is valid in 2-D, while the actual movement, in 3-D, is mainly exhibited as increased internal hip rotation. The single-limb mini squat is feasible and easy to administer in the clinical setting and in research to address lower extremity movement quality.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2474-11-265 contains supplementary material, which is available to authorized users.

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Autor: Eva Ageberg - Kim L Bennell - Michael A Hunt - Milena Simic - Ewa M Roos - Mark W Creaby


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