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New Computerized Method in Measuring the Sagittal Bowing of Femur from Plain Radiograph-A Validation Study.

Abstract：

BACKGROUND:Mismatch of intramedullary nails with the bowing of femur is a frequent clinical finding. Previous studies showed inconsistent results. METHODS:We present an algorithm of region growing territory method to get the radii of the anterior bowing of femur. We also tested it on ten radiographs. Plain radiographs of the lateral view of femur from five men and five women taken between January and August 2014 in Taipei Hospital were chosen randomly. The curvature of femur outline and medullary canal were measured for three times each. Radii of curvature of whole femur, proximal, middle and distal parts were calculated and analyzed. RESULTS:The coefficient of variation of the 240 measurements ranged from 0.007 to 0.295 and averaged 0.088. The average radii of curvature of the whole, proximal, middle, and distal femur were 1318 mm, 752 mm, 1379 mm, and 599 mm, respectively. At the distal part of the femur, the radius of curvature of the femur outline (452 mm) was smaller than the medullary canal (746 mm) (p < 0.05). Women's femur was straighter than men's when we compared the whole length (1435 mm vs. 1201 mm, p < 0.05). The radii we calculated were smaller than the current intramedullary nails. CONCLUSION:The results showed that the inter-observer and intra-observer differences are acceptable, support the impression that different bowing conditions existed for Asians as compared to Caucasians, and also indicate the mismatch of current instruments to the curvature of femur.

journal_name

J Clin Med

journal_title

Journal of clinical medicine

authors

Liaw CK,Chen YP,Wu TY,Fuh CS,Chang RF

doi

10.3390/jcm8101598

subject

Has Abstract

pub_date

2019-10-03 00:00:00

issue

10

issn

2077-0383

pii

jcm8101598

journal_volume

8

pub_type

杂志文章

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