Islam Kamrul, Dobbe Ashlee, Duke Kajsa, El-Rich Marwan, Dhillon Sukhvinder, Adeeb Samer, Jomha Nadr M
Department of Civil & Environmental Engineering, University of Alberta, Edmonton, AB, Canada.
Proc Inst Mech Eng H. 2014 Apr;228(4):371-8. doi: 10.1177/0954411914527741. Epub 2014 Mar 12.
Proper understanding of the complex geometric shape of the talus bone is important for the design of generic talar body prosthetics and restoration of the proper ankle joint function after surgery. To date, all talus implants have been patient-specific with the limitation that complex computer modeling is required to produce a mirrored image from the unaffected opposite side followed by machining a patient-specific prosthesis. To develop an "off-the-shelf" non-custom talar prosthesis, it is important to perform a thorough investigation of the geometric shape of the talus bone. This article addresses the applicability of a scaling approach for investigating the geometric shape and similarity of talus bones. This study used computed tomography scan images of the ankle joints of 27 different subjects to perform the analysis. Results of the deviation analyses showed that the deviation in the articulating surfaces of the talus bones was not excessive in terms of talus size. These results suggest that a proposed range of five implant sizes is possible. Finally, it is concluded that the talus bones of the ankle joints are geometrically similar, and a proposed range of five implant sizes will fit a wide range of subjects. This information may help to develop generic talus implants that might be applicable to patients with a severe talus injury.
正确理解距骨的复杂几何形状对于通用距骨体假体的设计以及术后恢复正常踝关节功能至关重要。迄今为止，所有距骨植入物都是针对特定患者的，其局限性在于需要复杂的计算机建模来从未受影响的对侧生成镜像，然后加工定制的假体。为了开发一种“现成的”非定制距骨假体，对距骨的几何形状进行全面研究很重要。本文探讨了缩放方法在研究距骨几何形状和相似性方面的适用性。本研究使用了27名不同受试者踝关节的计算机断层扫描图像进行分析。偏差分析结果表明，就距骨大小而言，距骨关节面的偏差并不过大。这些结果表明，有可能提出五种植入物尺寸的范围。最后得出结论，踝关节的距骨在几何形状上相似，并且提议的五种植入物尺寸范围将适合广泛的受试者。这些信息可能有助于开发适用于严重距骨损伤患者的通用距骨植入物。
