Cohen Tamara L, Altiok Haluk, Tarima Sergey, Smith Peter A, Harris Gerald F
Orthopaedic Rehabilitation and Engineering Research Center, Marquette University/MCW, Milwaukee, WI 53233, USA
Annu Int Conf IEEE Eng Med Biol Soc. 2012;2012:3352-5. doi: 10.1109/EMBC.2012.6346683.
The Ponseti method is a widely accepted and highly successful conservative treatment of pediatric clubfoot that relies on weekly manipulations and cast applications. However, the material behavior of the cast in the Ponseti technique has not been investigated. The current study sought to characterize the ability of two standard casting materials to maintain the Ponseti corrected foot position by evaluating creep response. A dynamic cast testing device (DCTD) was built to simulate a typical pediatric clubfoot. Semi-rigid fiberglass and rigid fiberglass casting materials were applied to the device, and the rotational creep was measured at various constant torques. The movement was measured using a 3D motion capture system. A 2-way ANOVA was performed on the creep displacement data at a significance level of 0.05. Among cast materials, the rotational creep displacement was found to be significantly different (p-values ≪ 0.001). The most creep displacement occurs in the semi-rigid fiberglass (approximately 1.0 degrees), then the rigid fiberglass (approximately 0.4 degrees). There was no effect of torque magnitude on the creep displacement. All materials maintained the corrected position with minimal change in position over time.
庞塞蒂方法是一种广泛接受且非常成功的小儿马蹄内翻足保守治疗方法，该方法依赖于每周的手法治疗和石膏固定。然而，庞塞蒂技术中石膏的材料特性尚未得到研究。当前研究旨在通过评估蠕变响应来表征两种标准石膏材料维持庞塞蒂矫正后足部位置的能力。构建了一个动态石膏测试装置（DCTD）以模拟典型的小儿马蹄内翻足。将半刚性玻璃纤维和刚性玻璃纤维石膏材料应用于该装置，并在各种恒定扭矩下测量旋转蠕变。使用三维运动捕捉系统测量运动。对蠕变位移数据进行双向方差分析，显著性水平为0.05。在石膏材料中，发现旋转蠕变位移有显著差异（p值远小于0.001）。蠕变位移最大的是半刚性玻璃纤维（约1.0度），其次是刚性玻璃纤维（约0.4度）。扭矩大小对蠕变位移没有影响。所有材料都能维持矫正后的位置，随着时间推移位置变化最小。
