We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Comparison of Femoral Angulation Measurement Between Radiographs and Anatomic Specimens Across a Broad Range of Varus Conformations.
- Authors
Palmer, Ross H.; Ikuta, Courtney L.; Cadmus, Jill M.
- Abstract
Objective: To determine if measurement of anatomic lateral distal femoral angle (aLDFA) from radiographs is valid across a broad range of femoral varus conformations. Study Design: Radiographic and anatomic study. Sample Population: Large breed canine cadavers (n = 5) and femora (n = 10). Methods: Cadavers were held in dorsal recumbency and 8 craniocaudal radiographic projections made of each femur: 1 image pre- and postosteotomy and at each of 6 progressive levels of induced distal varus deformity. Femurs were collected. Three blinded examiners independently measured varus on each radiograph (R-aLDFA) and femoral specimen (S-aLDFA) on 3 separate occasions. Intra- and interobserver variance in R-aLDFA and S-aLDFA measurements were determined. The strength of relationship between R-aLDFA and S-aLDFA and positive and negative predictive values for R-aLDFA were calculated. Results: Intra- and interobserver variance in R-aLDFA (mean, 0.54% and 0.40%, respectively) and S-aLDFA (mean, 0.43% and 0.41%, respectively) were acceptable. The strength of relationship between R-aLDFA and S-aLDFA (adjusted R² = 78.2%) was marginally below the acceptance criterion of 80%.Using aLDFA ≥ 102° as an indication for corrective femoral osteotomy, radiography was successful in correctly identifying corrective femoral osteotomy candidates (positive predictive value) and noncandidates (negative predictive value) 72% and 96% of the time, respectively. Conclusion: R-aLDFA did not reach the desired accuracy for femoral varus measurement across the range of conformations evaluated.
- Publication
Veterinary Surgery, 2011, Vol 40, Issue 8, p1023
- ISSN
0161-3499
- Publication type
Article
- DOI
10.1111/j.1532-950X.2011.00895.x