Authors: Massimo De Filippo Luca Saba Giulio Negrini Mario Silva Giuseppe Pedrazzi Francesco Pogliacomi Alessandro Castagna
Publish Date: 2015/07/01
Volume: 44, Issue: 10, Pages: 1491-1497
Abstract
The glenoid surface of ten dried cadaveric scapulae with intact surface was measured by and highprecision laser probe for optical scanning the latter being assumed as a reference standard Measurements were done according to the Pico technique using a circleshaped region of interest ROI that was placed on the inferior glenoid rim Measurements obtained using the CT Pico method three readers and with laser were compared to assess differences between radiological assessment and the reference standard Each observer performed two repeated measurements from each scapulae 20 for each observerMean differences between laser measurements and each CT reader were 184 range −4 to 61 for reader 1 124 range −15 to 64 for reader 2 and 11 range −14 to 58 for reader 3 Considering all the 60 measurements made by the three readers 39 measurements out of 60 65 were outside the range −5 +5 while 26 measurements 43 are outside the range −10 +10 The largest differences positive and negative were +64 and −14 respectively Intraoperator reproducibility was high in most cases intraclass correlation coefficient ICC =093 ICC = 091 ICC = 093 and Lin’s Concordance correlation coefficient CCC = 092 CCC = 090 CCC = 092 for reader 1 to 3 respectively However in five cases the CT Pico measurements showed absolute differences between the first and second measurements that exceeded 10 The interobserver variability for CT measurement of the glenoid surface using the CT Pico method was high when compared with laser in the assessment of glenoid surface in cadaveric specimens thus the CT Pico method is not reliable and could cause errors in the clinical management of the patient
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