Planning and correcting long bone deformities on the basis of using the models of 3D printing (A preliminary report)

Виленский В.А., Усов С.Ю., Соломин Л.Н.

Abstract


Purpose. To evaluate the planning of long bone deformity on the basis of the model of 3D printing.
Materials and Methods. A dog with posttraumatic deformity of forearm bones served as the object of the study. Computed tomography of the deformed and contralateral ("healthy") segments performed with creating the mirror copy of the intact forearm, thereby making the image of ideal correction. The three-dimensional models printed to a 3D. Thereafter the planning and modeling the deformity correction performed. The deformity correction implemented using Ortho-SUV, and the results compared with the planned ones.
Results. The protocol of correction modeling divided into two stages according to the principles of correcting deformities of both forearm bones. The first stage included performing transosseous osteosynthesis with Ortho-SUV Frame, radius osteotomy at the apex of the deformity with its further isolated correction in order to restore the relations in the distal radioulnar articulation. At the second stage additional transosseous elements inserted into radius, its osteotomy performed with subsequent 25-mm lengthening of both forearm bones. Rendering this method to a dog led to optimal deformity correction which conformed to the planned one.
Conclusion. The rendering deformity correction in the 3D model according to "healthy" segment image and the correction implementation using the orthopedic hexapod based on computer navigation provided a good result being the basis for wider introduction of the method.

Keywords


deformity correction, preoperative planning, 3D models, reference lines and angles (RLA), transosseous osteosynthesis, computer navigation, Ortho-SUV Frame

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