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Sensitivity and Specificity of 3D Models of the Radioulnar Joint Cup in Combination With a Sphere Fitted to the Ulnar Trochlear Notch for Estimation of Radioulnar Incongruence In Vitro
Author(s) -
Eljack Hamdi,
Werner Hinnerk,
Böttcher Peter
Publication year - 2013
Publication title -
veterinary surgery
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.652
H-Index - 79
eISSN - 1532-950X
pISSN - 0161-3499
DOI - 10.1111/j.1532-950x.2013.01096.x
Subject(s) - medicine , distal radioulnar joint , ulna , joint (building) , cadaver , population , anatomy , orthodontics , nuclear medicine , architectural engineering , environmental health , engineering
Objective To determine the sensitivity and specificity of estimation of radioulnar incongruence (RUI) by use of 3‐dimensional (3D) image renderings in combination with a sphere fitted to the ulnar trochlear notch. Study Design In vitro study. Sample Population Right forelimbs (n = 8) of canine cadavers weighing >20 kg. Methods CT‐based 3D models (n = 63) of the radioulnar joint cup with different states of RUI were used. A sphere was fitted to the trochlear notch of each of the models and 2 independent observers estimated RUI based on the relation of the sphere and the radial joint surface blinded to the true state of RUI at 1 mm precisely (−2 mm to +2 mm). Results Mean sensitivity and specificity for detecting any form of incongruent joint was 0.94 and 0.89, respectively. Evaluating a positive step (short radius) versus a congruent joint resulted in a mean sensitivity and specificity of 0.89 and 0.96, respectively. A negative RUI (short ulna) was diagnosed with a mean sensitivity and specificity of 1.00 and 0.92, respectively. Intra‐class‐correlation coefficient for inter‐observer agreement was 0.99. Conclusions Fitting a sphere to the ulnar trochlea notch significantly improves diagnostic accuracy of 3D models of the radioulnar joint cup when diagnosing RUI.