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Predictors of dynamic knee valgus during a classic ballet jump

Grant number: 18/25391-6
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): June 01, 2019
Effective date (End): December 31, 2019
Field of knowledge:Health Sciences - Physiotherapy and Occupational Therapy
Principal Investigator:Fábio Viadanna Serrão
Grantee:Vitor Leme
Home Institution: Centro de Ciências Biológicas e da Saúde (CCBS). Universidade Federal de São Carlos (UFSCAR). São Carlos , SP, Brazil

Abstract

The execution of complex movements during classical ballet practice results in a high prevalence of lower limb overuse injuries. It is believed that excessive dynamic knee valgus, influenced by both proximal (hip) and distal factors (ankle-foot complex), may be related to the occurrence of these lesions. Therefore, it is important to evaluate whether these proximal and distal factors are predictors of dynamic knee valgus during a classical ballet jump. The aim of this study is to analyze whether isometric abductor hip torque (proximal factor), ankle-forefoot alignment and range of motion (ROM) of ankle dorsiflexion (distal factors) are predictors of dynamic knee valgus during a classic ballet jump. Isometric hip abductor torque, leg-forefoot alignment and ankle dorsiflexion ROM will be evaluated in 15 ballet dancers. In addition, kinematic data will be collected and analyzed during the jump. A stepwise linear regression model will be applied to check whether the hip abductor isometric torque peak, leg-forefoot alignment and ankle dorsiflexion ROM are predictors of the dynamic knee valgus peak during the classical ballet jump.