Journal of Korean Foot and Ankle Society (대한족부족관절학회지)

Korean Foot & Ankle Society (대한족부족관절학회)
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Computerized Measurement on Angular Parameters for Hallux Valgus: Comparison of 100% and 150% Magnified Digital Radiography

무지 외반증 각변형에 대한 디지털영상의 전산화 계측: 100%와 150% 확대영상에서의 계측비교

  • Sung, Il-Hoon (Department of Orthopaedic Surgery, Hanyang University College of Medicine) ;
  • Lee, Doo-Yeon (Department of Orthopaedic Surgery, Hanyang University College of Medicine) ;
  • Sung, Chang-Ho (Department of Orthopaedic Surgery, Hanyang University College of Medicine) ;
  • Seo, Woo-Young (Department of Orthopaedic Surgery, Hanyang University College of Medicine)
  • 성일훈 (한양대학교 의과대학 정형외과학교실) ;
  • 이두연 (한양대학교 의과대학 정형외과학교실) ;
  • 성창호 (한양대학교 의과대학 정형외과학교실) ;
  • 서우영 (한양대학교 의과대학 정형외과학교실)
  • Received : 2012.01.15
  • Accepted : 2012.02.14
  • Published : 2012.03.15
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Abstract

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 $2.7^{\circ}$ $1.4^{\circ}$ and $5.0^{\circ}$ respectively in 100%-size images, and $2.6^{\circ}$, $1.6^{\circ}$ and $4.7^{\circ}$ 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.

Keywords

References

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