title: Effect of limb position on elbow congruity with CT evaluation.
abstract: OBJECTIVE
  To determine if computed tomographic (CT) measurement of radio-ulnar congruence (RUC) is affected by limb position.
  
  
  METHODS
  Prospective study.
  
  
  METHODS
  Labrador Retrievers (n=10).
  
  
  METHODS
  Each dog had both elbows imaged in neutral, supination, and pronation positions using helical CT acquisition, at 1 mm increments, in a transverse plane. RUC was calculated using a previously reported method and a new technique using 3-D image processing and measurements determined by a coordinate system.
  
  
  RESULTS
  The limits of agreement showed that comparing any pair of elbow positions yielded large discrepancies in measurements with the previously reported technique. Better agreement between pairs of elbow positions with reduced discrepancy was achieved using the 3-D technique. Variation in antebrachium positioning did yield a difference in congruence.
  
  
  CONCLUSIONS
  Limb position (supination, pronation) affects elbow congruity measurements using CT analysis. Use of 3-D image processing may allow for improved elbow congruity measurements compared with other 2-D measurement techniques.
  
  
  CONCLUSIONS
  Limb position must be controlled when performing CT evaluation of elbows for incongruity. 3-D imaging appears to be less affected by limb position than conventional 2-D analysis when assessing radioulnar incongruence.
authors.affiliation: Department of Surgery, Long Island Veterinary Specialists, Plainview, NY 11803, USA. marhouse@hotmail.com
authors.forename: Mark R
authors.initials: MR
authors.lastname: House
authors.forename: Dominic J
authors.initials: DJ
authors.lastname: Marino
authors.forename: Martin L
authors.initials: ML
authors.lastname: Lesser
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000175:diagnosis*; D004285:Dogs; D005260:Female; D005552:Forelimb / Q000473:pathology*; D007592:Joint Diseases / Q000175:diagnosis / Q000473:pathology / Q000662:veterinary*; D008297:Male; D014057:Tomography, X-Ray Computed / Q000662:veterinary*