Soterios Gyftopoulos MD, Presenter: Nothing to Disclose

Avner Yoez Yemin MD, Abstract Co-Author: Nothing to Disclose

Luis Saura Beltran MD, Abstract Co-Author: Nothing to Disclose

James S. Babb PhD, Abstract Co-Author: Nothing to Disclose

Marissa Lauren Albert MD,MSc, Abstract Co-Author: Nothing to Disclose

Laith M. Jazrawi MD, Abstract Co-Author: Consultant, Knee Creations, LLC Consultant, Ferring Group Consultant, Core Essence Orthopaedics, Inc Consultant, CONMED Corporation Consultant, Johnson & Johnson

Robert Meislin MD, Abstract Co-Author: Nothing to Disclose

Eric J. Strauss MD, Abstract Co-Author: Nothing to Disclose

To assess the accuracy of 3DMR shoulder reconstructions for estimating glenoid bone loss (GBL).

A retrospective review of patients who underwent MR shoulder examinations at our institution over the past 6 months was conducted with the following inclusion criteria: 1) history of shoulder dislocation, 2) Dixon 3D-T1W-FLASH sequence included in the protocol and post-processed into 3D reconstructions, 3) arthroscopy (OR) within 6 months of MRI and 4) GBL estimation performed in the OR using the bare-spot method and included in the OR report. Two readers blindly, independently estimated the percentage of bone loss along the width of the glenoid on the 3DMR reconstructions using the best-fit circle-method. Statistical analysis included a Wilcoxon test, and 95% confidence intervals to calculate the mean bias and absolute error for MRI compared to the OR estimates. Inter-reader agreement was assessed using intraclass (IC) and concordance correlation (CC) coefficient analysis.

There were a total of 14 patients (12-men, 2-women; mean age 29, range 19-51) that could be included in the study. There was no significant difference, on average, between the MRI and OR measures (p=0.767). A 95% confidence interval for the mean bias extended from -1.40% to 1.12%, implying that, when averaged over all patients, the true mean difference between the MRI and corresponding OR measures is expected to be less than 1.5%. A 95% confidence interval for the mean absolute error extended from 0.50% to 2.35%, implying that, when averaged over all patients, the true mean absolute error of the MRI measures relative to the OR measures is expected to be less than 2.35%. For inter-reader agreement, the measurements between the 2 readers had an IC of 0.92 and CC of 0.90, suggesting strong agreement.

3DMR reconstructions can be used to accurately quantify glenoid bone loss.

The efficacy of 3DMR shoulder reconstructions in the estimation of glenoid bone loss decreases the need for 3DCT and its associated radiation dose and cost.

Gyftopoulos, S, Yemin, A, Beltran, L, Babb, J, Albert, M, Jazrawi, L, Meislin, R, Strauss, E, Estimation of Glenoid Bone Loss Using 3DMR Reconstructions of the Shoulder.  Radiological Society of North America 2013 Scientific Assembly and Annual Meeting, December 1 - December 6, 2013 ,Chicago IL. http://archive.rsna.org/2013/13044157.html