Quantification of acetabular coverage in normal adult

R. M. Lin, Chyun-Yu Yang, C. Y. Yu, C. R. Yang, G. L. Chang, Y. L. Chou

Research output: Contribution to journalArticle

Abstract

Quantification of acetabular coverage is important and can be expressed by superimposition of cartilage tracings on the maximum cross-sectional area of the femoral head. A practical Autolisp program on PC AutoCAD has been developed by us to quantify the acetabular coverage through numerical expression of the images of computed tomography. Thirty adults (60 hips) with normal center-edge angle and acetabular index in plain X ray were randomly selected for serial drops. These slices were prepared with a fixed coordination and in continuous sections of 5 mm in thickness. The contours of the cartilage of each section were digitized into a PC computer and processed by AutoCAD programs to quantify and characterize the acetabular coverage of normal and dysplastic adult hips. We found that a total coverage ratio of greater than 80%, an anterior coverage ratio of greater than 75% and a posterior coverage ratio of greater than 80% can be categorized in a normal group. Polar edge distance is a good indicator for the evaluation of preoperative and postoperative coverage conditions. For standardization and evaluation of acetabular coverage, the most suitable parameters are the total coverage ratio, anterior coverage ratio, posterior coverage ratio and polar edge distance. However, medial coverage and lateral coverage ratios are indispensable in cases of dysplastic hip because variations between them are so great that acetabuloplasty may be impossible. This program can also be used to classify precisely the type of dysplastic hip.

Original languageEnglish
Pages (from-to)288-295
Number of pages8
JournalJournal of the Formosan Medical Association = Taiwan yi zhi
Volume90
Issue number3
Publication statusPublished - 1991 Jan 1

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Hip
Cartilage
Thigh
Tomography
X-Rays

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Lin, R. M., Yang, C-Y., Yu, C. Y., Yang, C. R., Chang, G. L., & Chou, Y. L. (1991). Quantification of acetabular coverage in normal adult. Journal of the Formosan Medical Association = Taiwan yi zhi, 90(3), 288-295.
Lin, R. M. ; Yang, Chyun-Yu ; Yu, C. Y. ; Yang, C. R. ; Chang, G. L. ; Chou, Y. L. / Quantification of acetabular coverage in normal adult. In: Journal of the Formosan Medical Association = Taiwan yi zhi. 1991 ; Vol. 90, No. 3. pp. 288-295.
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abstract = "Quantification of acetabular coverage is important and can be expressed by superimposition of cartilage tracings on the maximum cross-sectional area of the femoral head. A practical Autolisp program on PC AutoCAD has been developed by us to quantify the acetabular coverage through numerical expression of the images of computed tomography. Thirty adults (60 hips) with normal center-edge angle and acetabular index in plain X ray were randomly selected for serial drops. These slices were prepared with a fixed coordination and in continuous sections of 5 mm in thickness. The contours of the cartilage of each section were digitized into a PC computer and processed by AutoCAD programs to quantify and characterize the acetabular coverage of normal and dysplastic adult hips. We found that a total coverage ratio of greater than 80{\%}, an anterior coverage ratio of greater than 75{\%} and a posterior coverage ratio of greater than 80{\%} can be categorized in a normal group. Polar edge distance is a good indicator for the evaluation of preoperative and postoperative coverage conditions. For standardization and evaluation of acetabular coverage, the most suitable parameters are the total coverage ratio, anterior coverage ratio, posterior coverage ratio and polar edge distance. However, medial coverage and lateral coverage ratios are indispensable in cases of dysplastic hip because variations between them are so great that acetabuloplasty may be impossible. This program can also be used to classify precisely the type of dysplastic hip.",
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Lin, RM, Yang, C-Y, Yu, CY, Yang, CR, Chang, GL & Chou, YL 1991, 'Quantification of acetabular coverage in normal adult', Journal of the Formosan Medical Association = Taiwan yi zhi, vol. 90, no. 3, pp. 288-295.

Quantification of acetabular coverage in normal adult. / Lin, R. M.; Yang, Chyun-Yu; Yu, C. Y.; Yang, C. R.; Chang, G. L.; Chou, Y. L.

In: Journal of the Formosan Medical Association = Taiwan yi zhi, Vol. 90, No. 3, 01.01.1991, p. 288-295.

Research output: Contribution to journalArticle

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