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01.12.2017 | Research article | Ausgabe 1/2017 Open Access

BMC Medical Imaging 1/2017

Analysis of the three-dimensional anatomical variance of the distal radius using 3D shape models

Zeitschrift:
BMC Medical Imaging > Ausgabe 1/2017
Autoren:
Sebastian F. Baumbach, Jakob Binder, Alexander Synek, Fabian G. Mück, Yan Chevalier, Ekkehard Euler, Georg Langs, Lukas Fischer
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​s12880-017-0193-9) contains supplementary material, which is available to authorized users.

Abstract

Background

Various medical fields rely on detailed anatomical knowledge of the distal radius. Current studies are limited to two-dimensional analysis and biased by varying measurement locations. The aims were to 1) generate 3D shape models of the distal radius and investigate variations in the 3D shape, 2) generate and assess morphometrics in standardized cut planes, and 3) test the model’s classification accuracy.

Methods

The local radiographic database was screened for CT-scans of intact radii. 1) The data sets were segmented and 3D surface models generated. Statistical 3D shape models were computed (overall, gender and side separate) and the 3D shape variation assessed by evaluating the number of modes. 2) Anatomical landmarks were assigned and used to define three standardized cross-sectional cut planes perpendicular to the main axis. Cut planes were generated for the mean shape models and each individual radius. For each cut plane, the following morphometric parameters were calculated and compared: maximum width and depth, perimeter and area. 3) The overall shape model was utilized to evaluate the predictive value (leave one out cross validation) for gender and side identification within the study population.

Results

Eighty-six radii (45 left, 44% female, 40 ± 18 years) were included. 1) Overall, side and gender specific statistical 3D models were successfully generated. The first mode explained 37% of the overall variance. Left radii had a higher shape variance (number of modes: 20 female / 23 male) compared to right radii (number of modes: 6 female / 6 male). 2) Standardized cut planes could be defined using anatomical landmarks. All morphometric parameters decreased from distal to proximal. Male radii were larger than female radii with no significant side difference. 3) The overall shape model had a combined median classification probability for side and gender of 80%.

Conclusions

Statistical 3D shape models of the distal radius can be generated using clinical CT-data sets. These models can be used to assess overall bone variance, define and analyze standardized cut-planes, and identify the gender of an unknown sample. These data highlight the potential of shape models to assess the 3D anatomy and anatomical variance of human bones.
Zusatzmaterial
Additional file 1: Detailed description of the process of shape model generation. (DOCX 92 kb)
12880_2017_193_MOESM1_ESM.docx
Additional file 2: Animated illustration of the cross-sectional cut planes. Green plane: Proximal plane (50% of the distance between the tip of the styloid process and the most dorsal point of the tuberculum listerii); Blue plane: Middle plane (Half way between the distal and proximal sectional plane); Red plane: Distal plane (The most dorsal point of the tuberculum listerii). (PDF 140 kb)
12880_2017_193_MOESM2_ESM.pdf
Additional file 3: Animated illustrations of the first five modes of all radius models. A: Female left radii model; B: Female right radii model; C: Male left radii model; D: Male right radii model. (ZIP 9547 kb)
12880_2017_193_MOESM3_ESM.zip
Additional file 4: Illustration of the shape variance (number of modes) for each radius model. (TIF 57327 kb)
12880_2017_193_MOESM4_ESM.tif
Additional file 5: Illustration of the cross-sectional cut planes for ±1SD of the mean shape models. SD: Standard deviation; Distal: Distal plane; Middle: Middle plane; Proximal: Proximal plane. (TIF 9568 kb)
12880_2017_193_MOESM5_ESM.tif
Additional file 6: Summary of morphometric parameters (Mean, ±1SD) of the mean shape model for all three sectional planes. SD: Standard deviation; Distal: Distal plane; Middle: Middle plane; Proximal: Proximal plane. (DOCX 113 kb)
12880_2017_193_MOESM6_ESM.docx
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