Yoshinao Sato MD, Presenter: Nothing to Disclose

Taiki Nozaki MD, Abstract Co-Author: Nothing to Disclose

Atsushi Tasaki MD, Abstract Co-Author: Nothing to Disclose

Masaki Matsusako MD, PhD, Abstract Co-Author: Nothing to Disclose

Hiroshi Yoshioka MD, Abstract Co-Author: Nothing to Disclose

Yukihisa Saida MD, Abstract Co-Author: Nothing to Disclose

Yuka Morita MD, Abstract Co-Author: Nothing to Disclose

Saya Horiuchi MD, Abstract Co-Author: Nothing to Disclose

Gensuke Akaike MD, Abstract Co-Author: Nothing to Disclose

Goto Makoto, Abstract Co-Author: Nothing to Disclose

Takaharu Suzuki, Abstract Co-Author: Nothing to Disclose

The purpose of this study is to assess the accuracy of quantification of glenoid bone loss and evaluation of bony fragment on 3D-MRI as a substitute for 3D-CT.

Both MRI and CT were performed in 25 anterior instability patients. We used fat-suppressed 3D volumetric interpolated breath-hold examination on 3T-MRI, and 320-slice CT scanner that renders 3D-image. Based on the result of 3D-CT as the golden standard, the sensitivity and specificity of 3D-MRI for detection and quantification of glenoid bone loss and bony fragment were determined by two radiologists.

Glenoid bone loss were noted in 13 (52%), and bony fragment were found in 10 (40%) on 3D-CT. Compared with 3DCT, the sensitivity and specificity of 3D-MRI in detecting glenoid bone loss were 84.3%-92.3% and 91.7%-100%, respectively (kappa value = 0.92) and those of in detecting bony fragment were 90.0%-100% and 100%, respectively (kappa value = 0.96 ). Angular degree of glenoid bone loss was 87.5±34.8 on measurement used 3D-MRI, 80.0±29.4 on 3D-CT. There was no significant difference (p=0.109).

3D-MRI is a promising substitute for 3D-CT as a reliable method for evaluating glenoid bone loss and bony fragment in anterior shoulder instability.

3D-CT of the shoulder could be skipped from preoperative evaluation for anterior instability, and substituted 3D-MRI.

Sato, Y, Nozaki, T, Tasaki, A, Matsusako, M, Yoshioka, H, Saida, Y, Morita, Y, Horiuchi, S, Akaike, G, Makoto, G, Suzuki, T, Could 3D-CT of the Shoulder Be Omitted from Pre-operative Evaluation for Anterior Instability? –Comparison of 3D-MRI with 3D-CT–.  Radiological Society of North America 2013 Scientific Assembly and Annual Meeting, December 1 - December 6, 2013 ,Chicago IL. http://archive.rsna.org/2013/13044360.html