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Open Access J Sports Med. 2016 Nov 16;7:161-166. eCollection 2016.

Single-leg squats can predict leg alignment in dancers performing ballet movements in "turnout".

Author information

1
Western Australian Academy of Performing Arts, Edith Cowan University, Mt Lawley, WA, Australia.
2
Department of Physical Therapy, Nagoya Gakuin University, Seto, Japan.

Abstract

The physical assessments used in dance injury surveillance programs are often adapted from the sports and exercise domain. Bespoke physical assessments may be required for dance, particularly when ballet movements involve "turning out" or external rotation of the legs beyond that typically used in sports. This study evaluated the ability of the traditional single-leg squat to predict the leg alignment of dancers performing ballet movements with turnout. Three-dimensional kinematic data of dancers performing the single-leg squat and five ballet movements were recorded and analyzed. Reduction of the three-dimensional data into a one-dimensional variable incorporating the ankle, knee, and hip joint center positions provided the strongest predictive model between the single-leg squat and the ballet movements. The single-leg squat can predict leg alignment in dancers performing ballet movements, even in "turned out" postures. Clinicians should pay careful attention to observational positioning and rating criteria when assessing dancers performing the single-leg squat.

KEYWORDS:

clinical assessment; injury; motion capture

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