Abstract
As a basic osteotomy technique, U osteotomy can be applied for certain complex foot and ankle deformities. Gradual correction cases using Ilizarov apparatus and Taylor Spatial Frame have been reported. This paper proposes a novel parallel distraction apparatus for U osteotomy (PDA-Uos) to supplement the correction equipment for surgeon. Designed with an adjustable structure, the PDA-Uos can adopt different assembly shapes (joint connection points). However, the influence of the change in assembly shape on interference-free workspace and self-structural performance of the external fixator have received little attention. To address this issue and enhance the selection of the most suitable assembly shape for patient, an algorithm to obtain the interference-free workspace of different assembly shapes is proposed based on the inverse position solution of the PDA-Uos. Additionally, correction ability indices are defined according to the requirements of accurately controlled motion and high structural stiffness of the external fixator along the correction path. The results of simulation cases indicate that the interference-free workspace and the correction ability vary according to the assembly shape and thus the proposed method can be used to select an assembly shape with sufficient workspace and the best correction ability before performing correction for a given patient.
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Abbreviations
- CORA:
-
center of rotation of angulation
- CPMA:
-
correction path motion ability
- CPSA:
-
correction path stiffness ability
- DDMA:
-
directional distraction motion ability
- DDSA:
-
directional distraction stiffness ability
- DOF:
-
degrees of freedom
- EFRA:
-
external force resistance ability
- OSF:
-
Ortho-SUV frame
- PDA-Uos:
-
parallel distraction apparatus for U osteotomy
- ROM:
-
range of motion
- TSF:
-
Taylor Spatial Frame™
- U-P-S:
-
universal–prismatic–spherical
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Funding
This work was supported by the National Natural Science Foundation of China under Grants No. 51675008 and No. 51705007 and the Beijing Natural Science Foundation under Grants No. 3171001 and No. 17 L20019.
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Zuo, S., Dong, M., Li, J. et al. Configuration design and correction ability evaluation of a novel external fixator for foot and ankle deformity treated by U osteotomy. Med Biol Eng Comput 58, 541–558 (2020). https://doi.org/10.1007/s11517-019-02103-w
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DOI: https://doi.org/10.1007/s11517-019-02103-w