Measurement of the radiographic anatomy of the small and ring metacarpals using computerized tomographic scans View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2015-12

AUTHORS

Michael Rivlin, Nayoung Kim, Kevin F. Lutsky, Pedro K. Beredjiklian

ABSTRACT

BACKGROUND: To date, only plain radiographic definitions of normal anatomical parameters have been described. Our study aims to describe normal anatomic measurements of small and ring metacarpals using a novel digital reconstruction technique based on raw CT image data. We hypothesize that current plain radiographic data incorrectly describes normal metacarpal anatomy in the lateral plane. METHODS: Thirty-five scans of the small and 30 scans of the ring metacarpals form the basis for this study. Using a custom digital 3D image reformatting software, CT sections were reconstructed in the plane of each studied metacarpal. The 3D images were converted to sagittal and coronal weighted projections to represent lateral and posteroanterior (PA) 2D images that are equivalent to "perfect orthogonal" radiographs. Using a customized image measurement program, shaft lengths, shaft-bending angle (SBA), and capital-axis angle (CAA) were measured. RESULTS: Our results show that CAA averaged 14 and 12° in the ring and small metacarpals, respectively. Apex dorsal SBA averaged 12 and 10° in the ring and small metacarpals, respectively. On the PA images, the shafts are nearly straight. In contrast to prior reported values, we found the CAA to be less acute and the metacarpal curvature less pronounced on the lateral projection. We also demonstrated that much of the metacarpal apex dorsal bend is in the shaft itself. CONCLUSION: Normal anatomic parameters of metacarpals are based primarily on radiographic data, and as such are limited due to bony overlap in the lateral plane, as well as imperfect radiographic projections that are known to distort anatomical relationships. This novel method of image reconstruction eliminates metacarpal overlap and defines precise anatomical reference for metacarpals. More... »

PAGES

756-761

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11552-015-9766-7

DOI

http://dx.doi.org/10.1007/s11552-015-9766-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029221338

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26568736


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