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Technical note : a technique for measuring the surface area of articular cartilage in acetabular fractures

Hughes, Stephen & Brueton, Richard (1994) Technical note : a technique for measuring the surface area of articular cartilage in acetabular fractures. The British Journal of Radiology, 67(798), pp. 584-588.

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Abstract

The aim of this study was to develop a reliable technique for measuring the area of a curved surface from an axial computed tomography (CT) scan and to apply this clinically in the measurement of articular cartilage surface area in acetabular fractures. The method used was a triangulation algorithm. In order to determine the accuracy of the technique, areas of hemispheres of known size were measured to give the percentage error in area measurement. Seven such hemispheres were machined into a Perspex block and their area measured geometrically, and also from CT scans by means of the triangulation algorithm. Scans of 1, 2 and 4 mm slice thickness and separation were used. The error varied with slice thickness and hemisphere diameter. It was shown that the 2 mm slice thickness provides the most accurate area measurement, while 1 mm cuts overestimate and 4 mm cuts underestimate the area. For a hemisphere diameter of 5 cm, which is of similar size to the acetabulum, the error was -11.2% for 4 mm cuts, +4.2% for 2 mm cuts and + 5.1% for 1 mm cuts. As expected, area measurement was more accurate for larger hemispheres. This method can be applied clinically to quantify acetabular fractures by measuring the percentage area of intact articular cartilage. In the case of both column fractures, the percentage area of secondary congruence can be determined. This technique of quantifying acetabular fractures has a potential clinical application as a prognostic factor and an indication for surgery in the long term.

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ID Code: 47814
Item Type: Journal Article
Keywords: acetabulum, fracture, articular, cartilage, surface, area, hip, reconstruction, x-ray, computed, tomography
DOI: 10.1259/0007-1285-67-798-584
ISSN: 0007-1285
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 1994 British Institute of Radiology.
Deposited On: 20 Dec 2011 09:00
Last Modified: 21 Dec 2011 09:14

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