Brodsky J W, Kourosh S, Stills M, Mooney V
University of Texas Southwestern Medical Center, Department of Orthopedic Surgery, Dallas.
Foot Ankle. 1988 Dec;9(3):111-6. doi: 10.1177/107110078800900303.
Five of the most commonly used materials for shoe inserts (soft Plastazote, medium Pelite, PPT, Spenco, and Sorbothane) were objectively evaluated in the laboratory to characterize their behavior in the following three specific functions that correspond to clinical use: (1) the effect on the materials of repeated compression. (2) the effect of a combination of repetitive shear and compression. (3) the force-distribution (force-attenuation) properties of these materials, both when new and after repeated compression. The last function represents a model for relief of pressure beneath plantar bony prominences, a topic of special concern for the insensitive foot. All materials were effective in reducing transmitted force over the simulated bony prominence with a rank order of effectiveness. Other factors considered were: amount and rate of permanent deformation offset by considerations of enhanced moldability when comparing the neoprene and urethane materials with the polyethylene foams. The ideal insert represents a combination of material to achieve both durability and moldability.
在实验室中对五种最常用的鞋垫材料（软质Plastazote、中质Pelite、PPT、Spenco和Sorbothane）进行了客观评估，以表征它们在与临床应用相对应的以下三种特定功能中的表现：（1）反复压缩对材料的影响。（2）重复剪切和压缩相结合的影响。（3）这些材料在新的时候以及反复压缩后的力分布（力衰减）特性。最后一项功能代表了减轻足底骨性突出部位压力的模型，这是感觉迟钝足部特别关注的一个话题。所有材料在降低模拟骨性突出部位传递的力方面都有效，且有效程度有排名顺序。考虑的其他因素包括：在比较氯丁橡胶和聚氨酯材料与聚乙烯泡沫时，通过考虑增强的可模塑性来抵消永久变形的量和速率。理想的鞋垫代表了一种兼具耐用性和可模塑性的材料组合。
