109 Carolina Cabral de Mello Viero, M.S., Programa de Pós-Graduação em Ciências da Reabilitação, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Brazil. Luíza Pillar Kessler, P.T., and Camila Pinto, P.T., Departamento de Fisioterapia, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Brazil. Kaanda Nabilla Souza Gontijo, M.S., and Rodrigo Gomes da Rosa, M.S., Programa de Pós-Graduação em Ciências do Movimento Humano, Universidade Federal do Rio Grande do Sul (UFRGS), Brazil. Ana Kleiner, P.T., Department of Electronics, Information and Bioengineering, Politecnico di Milano, 20133 Milano, Lombardia, Italy. Leonardo Alexandre Peyré-Tartaruga, Ph.D., Programa de Pós-Graduação em Ciências do Movimento Humano, Universidade Federal do Rio Grande do Sul (UFRGS), and Escola de Educação Física, Fisioterapia e Dança, Universidade Federal do Rio Grande do Sul, Porto Alegre (UFRGS), Brazil. Alexandre Severo do Pinho, M.S., Programa de Pós-Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), and Bolsista de desenvolvimento técnico e industrial da Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS), Brazil. Aline de Souza Pagnussat, Ph.D., Programa de Pós-Graduação em Ciências da Reabilitação, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Programa de Pós- Graduação em Ciências da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), and Departamento de Fisioterapia, Universidade Federal de Ciências da Saúde de Porto Alegre (UFCSPA), Brazil. Correspondence: Aline de Souza Pagnussat, Ph.D., Department of Physical erapy, Universidade Federal de Ciências da Saúde de Porto Alegre – UFCSPA, 245 Sarmento Leite Street, 90050-170 - Porto Alegre, RS, Brazil; alinespagnussat@ gmail.com. Copyright © 2017 J. Michael Ryan Publishing, Inc. hps://doi.org/10.12678/1089-313X.21.3.109 Abstract e purpose of this study was to evaluate the midfoot longitudinal arch height and correlate it with active hip external rota- tion (ER) in dancers during static postures and technical steps of classical ballet (i.e., first position, demi-plié, battement fondu à la seconde, pas jeté à la seconde, and grand jeté à la seconde). A 3D motion analysis system was used for kinematic analysis. e arch height was significantly reduced during the battement fondu à la seconde, pas jeté à la seconde, and grand jeté à la seconde when compared to standing (p = 0.000 for all comparisons), first position (p = 0.000, p = 0.000, and p = 0.001, respectively) and demi-plié (p = 0.015, p = 0.003, and p = 0.006, respectively). No significant correlation was found between arch height and active hip external rotation (p > 0.05). Hence, active hip external rotation does not seem to be related to midfoot pronation in this sample. Other factors, such as intrinsic and extrinsic foot muscle strength, may be related to the midfoot arch height. These findings contribute to a better understanding of ballet steps, but future studies are required to clarify this topic completely. A successful career in classical ballet demands strength and flexibility from the dancer. The classical ballet technique is a traditional and formal style in which maintaining the “en dehor” is an important part. En dehor is the term used to describe the outward rotation of both legs with an angle of 180° be- tween the medial borders of the feet. is position allows dancers to reach a greater leg range of motion (ROM) while performing technical steps. 1,2 e en dehor is the foundation for most ballet steps, including first position, demi-plié, battement fondu à la seconde, pas jeté à la seconde, and grand jeté à la seconde. Hip external rotation (ER) is considered the major contributor to achieving the en dehor, and it is the result of muscle strength, soft tissue extensibility, and skeletal anatomy. 3-6 ese factors are related to the duration of classical ballet training and involve such aspects as frequency, intensity, and correct execution of the technique. 3-5 Many dancers with insufficient hip ER attempt to increase en dehor by obtaining additional movement at other joints. A technique commonly used for compensation is to place the feet in 180° with the hips and knees flexed and then force the hips and knees into extension without moving the feet. is technique is known in balletic circles as “screwing the knee.” e resulting compensatory movements that occur at joints other than the hip may lead to acute and Height of the Medial Longitudinal Arch During Classical Ballet Steps Carolina Cabral de Mello Viero, M.S., Luíza Pillar Kessler, P.T., Camila Pinto, P.T., Kaanda Nabilla Souza Gontijo, M.S., Rodrigo Gomes da Rosa, M.S., Ana Kleiner, Ph.D., Leonardo Alexandre Peyré-Tartaruga, Ph.D., Alexandre Severo do Pinho, M.S., and Aline de Souza Pagnussat, Ph.D.