title: Using additive manufacturing in accuracy evaluation of reconstructions from computed tomography.
abstract: Bone models derived from patient imaging and fabricated using additive manufacturing technology have many potential uses including surgical planning, training, and research. This study evaluated the accuracy of bone surface reconstruction of two diarthrodial joints, the hip and shoulder, from computed tomography. Image segmentation of the tomographic series was used to develop a three-dimensional virtual model, which was fabricated using fused deposition modelling. Laser scanning was used to compare cadaver bones, printed models, and intermediate segmentations. The overall bone reconstruction process had a reproducibility of 0.3 ± 0.4 mm. Production of the model had an accuracy of 0.1 ± 0.1 mm, while the segmentation had an accuracy of 0.3 ± 0.4 mm, indicating that segmentation accuracy was the key factor in reconstruction. Generally, the shape of the articular surfaces was reproduced accurately, with poorer accuracy near the periphery of the articular surfaces, particularly in regions with periosteum covering and where osteophytes were apparent.
authors: Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada.
authors: Erin J
authors: EJ
authors: Smith
authors: Joseph A
authors: JA
authors: Anstey
authors: Gabriel
authors: G
authors: Venne
authors: Randy E
authors: RE
authors: Ellis
mesh_terms: D001842:Bone and Bones / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D003198:Computer Simulation; D017076:Computer-Aided Design; D006621:Hip Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008953:Models, Anatomic; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012785:Shoulder Joint / Q000033:anatomy & histology / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Additive manufacturing; bone modelling; computed tomography; rapid prototyping