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Interobserver agreement on the assessability of standard ventrodorsal hip-extended radiographs and its effect on agreement in the diagnosis of canine hip dysplasia and on routine FCI scoring

Geert Verhoeven (UGent) , Frank Coopman (UGent) , Luc Duchateau (UGent) , Tim Bosmans (UGent) , Bernadette Van Ryssen (UGent) and Henri van Bree (UGent)
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Abstract
Insufficient agreement on scoring hip quality might be caused by differences in the assessability of a radiograph (exposure, contrast, positioning, and diagnostic quality). We studied the agreement in assessability of standard ventrodorsal hip-extended radiographs by experienced (nine) and inexperienced (21) observers, using the standard subjective method of quality control, currently applied in screening programs. The effect of assessability on the agreement of scoring hip quality [dysplastic vs. nondysplastic and the final Federation Cinologique International (FCI) score] was also investigated. There was a significant difference (P < 0.0001) in agreement on assessability between the experienced and inexperienced observers. In 68% of evaluations, experienced observers stated that the radiograph was assessable. Inexperienced observers evaluated the radiographs as being assessable in only 46.5% of evaluations. Increased interobserver agreement on assessability of a radiograph did not increase the overall interobserver agreement in the diagnosis of hip dysplasia, nor did it result in consistent scoring of the hip status from that radiograph, despite a significant (P < 0.05) increase in agreement of FCI scoring with an increasing agreement on assessability at a one to five ratio in the experienced group. The inconsistent evaluation of radiographic quality, as well as the inconsistent evaluation of the hip quality, caused differences in diagnosing hip dysplasia and FCI scoring in the same dog ranging from excellent hips to moderate hip dysplasia. Therefore, the credibility of the FCI screening method for canine hip dysplasia, using the standard hip-extended radiographic view, as currently applied in most European countries, is questionable.
Keywords
canine, hip dysplasia, agreement

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Chicago
Verhoeven, Geert, Frank Coopman, Luc Duchateau, Tim Bosmans, Bernadette Van Ryssen, and Henri van Bree. 2009. “Interobserver Agreement on the Assessability of Standard Ventrodorsal Hip-extended Radiographs and Its Effect on Agreement in the Diagnosis of Canine Hip Dysplasia and on Routine FCI Scoring.” Veterinary Radiology & Ultrasound 50 (3): 259–263.
APA
Verhoeven, G., Coopman, F., Duchateau, L., Bosmans, T., Van Ryssen, B., & van Bree, H. (2009). Interobserver agreement on the assessability of standard ventrodorsal hip-extended radiographs and its effect on agreement in the diagnosis of canine hip dysplasia and on routine FCI scoring. VETERINARY RADIOLOGY & ULTRASOUND, 50(3), 259–263.
Vancouver
1.
Verhoeven G, Coopman F, Duchateau L, Bosmans T, Van Ryssen B, van Bree H. Interobserver agreement on the assessability of standard ventrodorsal hip-extended radiographs and its effect on agreement in the diagnosis of canine hip dysplasia and on routine FCI scoring. VETERINARY RADIOLOGY & ULTRASOUND. 2009;50(3):259–63.
MLA
Verhoeven, Geert, Frank Coopman, Luc Duchateau, et al. “Interobserver Agreement on the Assessability of Standard Ventrodorsal Hip-extended Radiographs and Its Effect on Agreement in the Diagnosis of Canine Hip Dysplasia and on Routine FCI Scoring.” VETERINARY RADIOLOGY & ULTRASOUND 50.3 (2009): 259–263. Print.
@article{676002,
  abstract     = {Insufficient agreement on scoring hip quality might be caused by differences in the assessability of a radiograph (exposure, contrast, positioning, and diagnostic quality). We studied the agreement in assessability of standard ventrodorsal hip-extended radiographs by experienced (nine) and inexperienced (21) observers, using the standard subjective method of quality control, currently applied in screening programs. The effect of assessability on the agreement of scoring hip quality [dysplastic vs. nondysplastic and the final Federation Cinologique International (FCI) score] was also investigated. There was a significant difference (P {\textlangle} 0.0001) in agreement on assessability between the experienced and inexperienced observers. In 68\% of evaluations, experienced observers stated that the radiograph was assessable. Inexperienced observers evaluated the radiographs as being assessable in only 46.5\% of evaluations. Increased interobserver agreement on assessability of a radiograph did not increase the overall interobserver agreement in the diagnosis of hip dysplasia, nor did it result in consistent scoring of the hip status from that radiograph, despite a significant (P {\textlangle} 0.05) increase in agreement of FCI scoring with an increasing agreement on assessability at a one to five ratio in the experienced group. The inconsistent evaluation of radiographic quality, as well as the inconsistent evaluation of the hip quality, caused differences in diagnosing hip dysplasia and FCI scoring in the same dog ranging from excellent hips to moderate hip dysplasia. Therefore, the credibility of the FCI screening method for canine hip dysplasia, using the standard hip-extended radiographic view, as currently applied in most European countries, is questionable.},
  author       = {Verhoeven, Geert and Coopman, Frank and Duchateau, Luc and Bosmans, Tim and Van Ryssen, Bernadette and van Bree, Henri},
  issn         = {1058-8183},
  journal      = {VETERINARY RADIOLOGY \& ULTRASOUND},
  language     = {eng},
  number       = {3},
  pages        = {259--263},
  title        = {Interobserver agreement on the assessability of standard ventrodorsal hip-extended radiographs and its effect on agreement in the diagnosis of canine hip dysplasia and on routine FCI scoring},
  url          = {http://dx.doi.org/10.1111/j.1740-8261.2009.01530.x},
  volume       = {50},
  year         = {2009},
}

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