Department of Biomedical Engineering, College of Engineering, University of Wisconsin Madison, Madison, WI, USA.
Department of Mechanical Engineering, College of Engineering, University of Wisconsin Madison, Madison, WI, USA.
Proc Inst Mech Eng H. 2021 Aug;235(8):849-860. doi: 10.1177/09544119211012115. Epub 2021 Apr 25.
One fifth of idiopathic clubfoot deformities cannot be fully corrected by Serial Ponseti casting and deformity recurs in 20%-30% of cases. To avoid x-ray exposure, the joints with largely unossified bones are diagnosed with magnetic resonance images (MRI). Typically, geometric measurements are made in the MRI planes; however, this method is inaccurate compared to measurements on three-dimensional (3D) models of the joint. More accurate measurements using the 3D bone shapes may be better at identifying differences between groups; and therefore, improve diagnosis. The entire set of shape features from MRI can be analysed simultaneously through statistical shape modelling (SSM) which assesses bone morphology of clubfoot in a more sensitive way. A method for SSM of the talus is developed in this study and the shape of the normal talus is compared with the one in clubfeet with residual deformity through both geometric measurements and SSM. Significant differences between two groups were found by both methods; and therefore, might contribute to improve diagnosis of clubfoot.
五分之一的特发性马蹄内翻足畸形不能通过连续潘塞蒂石膏矫形完全矫正，20%-30%的病例会出现畸形复发。为了避免 X 射线照射，大部分未骨化的关节通过磁共振成像（MRI）进行诊断。通常，在 MRI 平面上进行几何测量；然而，与关节的三维（3D）模型上的测量相比，这种方法不够准确。使用 3D 骨骼形状进行更准确的测量可能更能识别组间差异；因此，提高诊断的准确性。通过统计形状建模（SSM）可以同时分析来自 MRI 的整套形状特征，这种方法以更敏感的方式评估马蹄内翻足的骨骼形态。本研究中开发了一种距骨 SSM 方法，并通过几何测量和 SSM 比较了正常距骨和残余畸形的马蹄内翻足的形状。两种方法都发现了两组之间的显著差异；因此，可能有助于提高马蹄内翻足的诊断。
