Abstract
Purpose
Reverse shoulder arthroplasty (RSA) is an effective surgery for severe shoulder joint diseases. Traditionally, the preoperative planning procedure of RSA is manually conducted by experienced surgeons, resulting in prolonged operating time and unreliable drilling paths of the prosthetic fixation screws. In this study, an automatic surgical planning algorithm for RSA was proposed to compute the optimal path of screw implantation.
Methods
Firstly, a cone-shaped space containing alternative paths for each screw is generated using geometric parameters. Then, the volume constraint is applied to automatically remove inappropriate paths outside the bone boundary. Subsequently, the integral of grayscale value of the CT is used to evaluate the bone density and to compute the optimal solution. An automatic surgical planning software for RSA was also developed with the aforementioned algorithms.
Results
Twenty-four clinical cases were used for preoperative planning to evaluate the accuracy and efficiency of the system. Results demonstrated that the angles among the prosthetic fixation screws were all within constraint angle(45°), and the stability rate of the planned prosthesis was 94.92%. The average time for the automatic planning algorithm was 4.39 s, and 83.96 s for the whole procedure. Repetitive experiments were also conducted to demonstrate the robustness of our system, and the variance of the stability coefficient was 0.027%.
Conclusions
In contrast to the cumbersome manual planning of the existing methods for RSA, our method requires only simple interaction operations. It enables efficient and precise automatic preoperative planning to simulate the ideal placement of the long prosthetic screws for the long-term stability of the prosthesis. In the future, it will have great clinical application prospects in RSA.
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (81971709; M-0019; 82011530141), the Foundation of Science and Technology Commission of Shanghai Municipality (19510712200; 20490740700), Shanghai Jiao Tong University Foundation on Medical and Technological Joint Science Research (YG2019ZDA06; YG2021ZD21; YG2021QN72; YG2022QN056), the Program of Shanghai Academic/Technology Research Leader (19XD1402800), the Shanghai Municipal Education Commission Scientific Research and Innovation Program (2021-01-07-00-02-E00082), the Clinical Research Center of Shanghai University of Medicine & Health Sciences (20MC2020003), the Academician Expert Workstation of the Jinshan District (jszjz2020007Y), the Plan of Medical Key Specialty Construction, and the Shanghai Health Committee (ZK2019B03).
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Li, H., Xu, J., Zhang, D. et al. Automatic surgical planning based on bone density assessment and path integral in cone space for reverse shoulder arthroplasty. Int J CARS 17, 1017–1027 (2022). https://doi.org/10.1007/s11548-022-02633-z
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DOI: https://doi.org/10.1007/s11548-022-02633-z