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KMID : 1130920120160010053
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Journal of Korean Foot and Ankle Society
2012 Volume.16 No. 1 p.53 ~ p.57
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Computerized Measurement on Angular Parameters for Hallux Valgus: Comparison of 100% and 150% Magnified Digital Radiography
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Sung Il-Hoon
Lee Doo-Yeon
Sung Chang-Ho
Seo Woo-Young
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Abstract
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Purpose: To study computerized measurements of angular parameters on 100% and 150% resized digital radiography of hallux valgus deformity
Materials and Methods: 30 digital radiography of standing foot anteroposterior view of hallux valgus patients were included. Two observers(A, B) independently measured hallux valgus angle (HVA), 1-2 intermetatarsal angle (IMA), and distal metatarsal articular angle (DMAA) in two times on both 100%-size and 150% magnified images respectively, using computerized measurement software tools. The results were interpreted with the statistical software program, Statistical Analysis System, version 9.2.
Results: In repeated measurements of each observer, measurements on 150% magnified image showed no differences of all three parameters and with 100%-size image, there were differences of HVA (observer A) and 1-2 IMA (observer B) (p>0.05). When testing interobserver reliability, both observers showed differences in measurement of HVA and DMAA (p<0.05), but no differences in measurement of 1-2 IMA in both images. Within the 95% confidence interval, limits of error of measurements between two observers on HVA, IMA and DMAA were 2.7° 1.4° and 5.0° respectively in 100%-size images, and 2.6°, 1.6° and 4.7° respectively in 150% magnified images.
Conclusion: In computerized measurements for angular parameters of hallux valgus with digital radiography, 150% magnified images showed intraobserver reliability. Both 100% and 150% magnified images failed to show interobserver reliability. Measurement of 1-2 IMA in both 100% and 150% images showed less interobserver error.
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KEYWORD
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Hallux valgus, Angular parameters, Computerized measurement
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