Physical Medicine / OMM
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12503/30451
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Browsing Physical Medicine / OMM by Author "Surve, Sajid"
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Item Compensatory tibial torsion as a component of turnout in professional ballet dancers(2021) Mirochnitchenko, Alissa; Surve, Sajid; Patterson, RitaPurpose Classical ballet emphasizes external rotation (ER) of the hip joint as the primary mechanism of turnout, with ideal turnout being 90 degrees in each leg. Due to anatomical constraints, few dancers are able to achieve this ideal without compensating elsewhere in the kinetic chain. One mechanism of compensation for inadequate hip ER is tibial torsion. The purpose of this study is to determine the contribution of tibial torsion to turnout in a sample of professional ballet dancers. Methods The study sample consisted of five male and five female professional ballet dancers. Using motion capture technology, each dancer was filmed completing barre exercises at three times during the performance season. Rotational movement at the femoroacetabular, tibiofemoral and tibiotalar joints was approximated using motion markers. Results While the majority of external rotation during all movements originated at the femoroacetabular joint, females demonstrated 12-14 degrees of turnout originating at the tibiofemoral joint, and males demonstrated 15-17 degrees. Across all movements, females demonstrated more turnout originating at the hip joint than males. Conclusions According to classical ballet aesthetics, a turnout of 90 degrees is expected in each leg, with only 5 degrees of total turnout originating from each knee joint. The degrees of turnout originating from the knee in this sample exceed these values. Furthermore, the use of non-invasive motion-based testing such as motion capture allows for the creation of a three-dimensional model which may be used for performance tracking and injury prevention in dancers.Item Movement Patterns in Dancers: analysis of pelvis and hip movement in elite ballerinas(2021) Mirochnitchenko, Alissa; Surve, Sajid; Patterson, RitaPurpose: Ballet dancers place extreme demands on their bodies throughout their careers. To reduce injury risk and prolong a ballet dancer's career, attention must be paid to correct positioning and joint biomechanics. The specific aim of the Movement Patters in Dancers study was to observe changes in posture and movement throughout the ballet performance season. Methods: The study sample consisted of five male and five female professional ballet dancers. Using motion capture technology, each dancer was filmed completing barre exercises at three different times during the performance season. Movement of the pelvis was analyzed in three planes of motion: medial/lateral, flexion/extension, and torsion about a longitudinal axis. Additionally, the hip angle, defined as the angle between the femurs, was calculated. Results: Dancers demonstrated consistency in pelvis movement in all planes throughout the performance season. The degrees of motion observed in each plane varied with the direction in which the movement was performed (side, front, and back). No significant changes were observed between visits. Hip angle varied between the left and right side in both male and female dancers, with female dancers demonstrating larger differences between legs. Conclusions: The pelvic stability demonstrated in this study was reflective of dancers' level of proficiency and training. The difference in hip angle between the left and right legs could be explained by dancers having a dominant leg. Further analyses of the collected data can contribute towards creating a model to assess dancers at different levels of training and assist dancers recovering from injury.