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Copyright © 1989 by British Editorial Society of Bone and Joint Surgery
Measurement of acetabular erosion. The effect of pelvic rotation on common landmarks
Orthopaedic Academic Unit, Rayne Institute, St. Thomas' Hospital, London, England.
Using dried bones which could be tilted and rotated, we assessed the accuracy of published radiographic methods for measuring the migration of prosthetic acetabular components and compared the results with a new method. The new line linking acetabular margins was significantly more accurate for proximal migration than the teardrop, the sacroiliac line or the sacroiliac-symphysis line. For medial migration, a new line tangential to the brim and through the horizontal mid-point of the obturator foramen was more accurate than Kohler's line, the ilio-ischial line or the iliopubic line. In combination, the two new lines can give a more accurate assessment of acetabular erosion than previous methods, since they are less affected by the differences in rotation commonly found in a series of radiographs. This article has been cited by other articles:
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