PMID: 8600954Mar 1, 1996Paper

Reliability of radiological measurements of the distraction gap during leg lengthening

Acta Radiologica
B TjernströmL Rehnberg

Abstract

The aim of this study was to determine the accuracy of length measurements on plain radiographs during leg lengthening and to evaluate a reliable method of measuring the amount of lengthening suitable for clinical praxis. In an experimental study, a plastic femur was lengthened 40 mm and assessed radiographically in different positions, and the orthoradiographically calculated total length of the femur was compared with the true value. In a clinical study, 96 radiographs encompassing 14 femoral and 2 tibial lengthenings were assessed on a digitized table with a computer program (PROFILE) with regard to the amount of lengthening and the degree of magnification. The radiographic magnification in the experimental study, depending on position of the femur, was 17% (5-25%), and in the clinical material it averaged 16% (0-36%). Radiographs obtained with a radiopaque ruler placed at the same level as the lengthened bone allowed reliable measurements of the distraction gap.

References

Feb 1, 1991·AJR. American Journal of Roentgenology·C W WalkerJ J Seibert
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Citations

May 29, 2009·Acta Orthopaedica. Supplementum·Leif Pål Kristiansen
Jul 16, 2019·The American Journal of Forensic Medicine and Pathology·Ozgur BulutSafa Gurcan

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