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Ankle and foot contributions to extreme plantar- and dorsiflexion in female ballet dancers.

机译:脚踝和脚对女性芭蕾舞演员极端extreme屈和背屈的贡献。

摘要

Background: Female ballet dancers require extreme ankle motion. The objective of this study was to quantify the relative contributions of the ankle and various foot joints to extreme plantarflexion (PF) and dorsiflexion (DF) in female ballet dancers using an X-ray superimposition technique and digital graphics software. Materials and Methods: One asymptomatic ankle was studied in each of seven experienced female ballet dancers. Three lateral weightbearing X-rays were taken of each ballet dancer's ankle: en pointe (maximum PF), in neutral position, and in demi-plié (maximum DF). Using graphics software, a subject's three X-ray images were superimposed and the tali were aligned. On each image the tibia, navicular, intermediate cuneiform, and first metatarsal were marked. Positional differences of a bone's line among the three images demonstrated angular movement of the bone in degrees. The neutral position was the reference from which both PF and DF of the bones were calculated. Results: The talocrural joint contributed the most motion of any pair of bones evaluated for both PF and DF, with mean movements of 57.6 ± 5.2 degrees en pointe and 24.6 ± 9.6 degrees in demi-plié. Approximately 70% of total PF and DF were attributable to the talocrural joint, with the remaining 30% coming from motion between adjacent pairs of the studied foot bones. Conclusion: Superimposed X-rays for assessing ankle and foot contributions to the extreme positions required of female ballet dancers offer insight into how these positions are attained that is not available via goniometry. Clinical Relevance: Functional information gained from this study may assist clinicians in assessessing ankle and foot pain in these individuals.
机译:背景:女芭蕾舞演员要求极端的脚踝运动。这项研究的目的是使用X射线叠加技术和数字图形软件来量化踝关节和各个脚关节对女性芭蕾舞蹈者的极端flex屈(PF)和背屈(DF)的相对贡献。材料和方法:在七个有经验的女芭蕾舞演员中,每个人都研究了一个无症状的脚踝。对每个芭蕾舞演员的脚踝进行三个侧面负重X光检查:站立(最大PF),处于中立位置和半折叠(最大DF)。使用图形软件,将对象的三张X射线图像叠加在一起,然后对齐塔利。在每幅图像上,都标出了胫骨,舟状,中间楔形和第一meta骨。这三幅图像之间的骨骼线位置差异证明了骨骼的角度运动(以度为单位)。中立位置是参考,从中可以计算骨骼的PF和DF。结果:在PF和DF评估中,滑枕关节贡献最大的一对骨骼运动,对位平均运动为57.6±5.2度,半合位平均运动为24.6±9.6度。总PF和DF中约有70%归因于滑膜关节,其余30%来自研究的相邻两对脚骨之间的运动。结论:叠加的X射线用于评估脚踝和脚对女芭蕾舞演员所要求的极端姿势的贡献,从而可以深入了解如何获得这些姿势,而这些角度是无法通过测角法获得的。临床相关性:从这项研究中获得的功能信息可能会帮助临床医生评估这些个体的脚踝和足部疼痛。

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