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A new method for estimating three-dimensional movement of the patella using a surface mapping method and computed tomography.

ABSTRACT: Introduction:A previous study reported a method called the 2D-3D registration technique to examine three-dimensional movement of the patella. However, that method requires a biplane fluoroscopy system. In the present study, the aim was to establish a new method (CT-based surface mapping method) to estimate three-dimensional positions and angles of the patella with a motion capture system and CT. Methods:In Study 1, the most appropriate parameters for the CT-based surface mapping method (i.e., target edge length, threshold of thickness of the soft tissue, and minimum distance between markers) were explored and determined. In Study 2, three-dimensional movement (i.e., positions and angles) of the patella using the CT-based surface mapping method and the most appropriate parameters were determined, and they were compared with the true positions and angles obtained by CT. Results:The results of Study 1 showed that the most appropriate conditions were as follows: (1) target edge length, 3 mm; (2) threshold of thickness of the soft tissue, 0-20 mm; and (3) minimum distance between markers, 10 mm. The results of Study 2 showed that the errors of the positions and angles were less than approximately 10 mm and 10° at most, respectively (both supine and sitting positions). Conclusion:The CT-based surface mapping method may be useful for a future study to clarify differences in three-dimensional movements of the patella between patients with patellar tendinitis and healthy subjects.

SUBMITTER: Inai T

PROVIDER: S-EPMC7452489 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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A new method for estimating three-dimensional movement of the patella using a surface mapping method and computed tomography.

Inai Takuma T Takabayashi Tomoya T Watanabe Satoshi S Ikezu Masahiro M Kaneko Fumiya F Matsuzawa Kanta K Edama Mutsuaki M

Heliyon 20200818 8

<h4>Introduction</h4>A previous study reported a method called the 2D-3D registration technique to examine three-dimensional movement of the patella. However, that method requires a biplane fluoroscopy system. In the present study, the aim was to establish a new method (CT-based surface mapping method) to estimate three-dimensional positions and angles of the patella with a motion capture system and CT.<h4>Methods</h4>In Study 1, the most appropriate parameters for the CT-based surface mapping m ...[more]

PMID: 32904170

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A new method for estimating three-dimensional movement of the patella using a surface mapping method and computed tomography.

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A new method for estimating three-dimensional movement of the patella using a surface mapping method and computed tomography.

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