Prof. Lennard Funk’s Education Portal

Call: 01625 545071
Email: [email protected]
For treatment enquires visit The Arm Clinic

THE MEASUREMENT OF THE GLENOID BONY DEFECT IN SHOULDER INSTABILITY WITH 3D CT AND MRI-A : A COMPARATIVE STUDY

Authors: C Jaspars; J Markenstein; S Rijkenberg; J Willems;

References: Presented at SECEC 2009

Purpose
The purpose of this study was to investigate if MRI-arthro is as reliable as 3D CT technique in quantifying the glenoid bone loss in patients with anterior shoulder instability. We compared MR-arthro "en face view "images of the glenoid with three-dimensionally reconstructed computed tomography images.

Material and Methods
We included 35 patients with recurrent anterior shoulder instability. MR-arthro-images and 3D CT images were collected pre-operatively. Images were randomised and blinded for two observers. Each observer measured the series twice, with an appropriate interval of three weeks. The intra class correlation of intra- and inter observer reliability was determined, using SPSS® version 16.0.

Results
The intra-observer reliability of observer A with 3D CT for the 1st and the 2nd measurement is. 953 (95% CI =.907-.976) and for MR-arthro. 713 (95% CI =.432 -.855). For observer B the intra-observer reliability is. 954 with 3D CT (95% CI =. 909-.977) and. 942 with MR-arthro (95% CI =.884-.970). The inter-observer reliability between the two observers for the 1st measurement of 3D CT images was. 845 (95% CI =. 694-.922) and for MR-arthro. 538 (95% CI =. 085-.767). Reviewing the 2nd measurements of 3D CT we found an inter-observer reliability : ICC. 915 (95% CI =.831-.957) and. 819 (95% CI =. 642-.909) (MRI images). When comparing 3D CT with MR-arthro, we found good results. For observer A : 1st measurement : ICC. 439 (95% CI = -.111-.717) and for the 2nd measurement : ICC. 765 (95% CI =. 538-.882). Observer B ICC (MRI vs. CT) :. 711 (95% CI =. 428-.854) and. 731 (2nd series) (95% CI =.467-.864).

Conclusion
This study shows that the method of MR-arthro is a promising method of pre-operative radiographic analysis in patients with recurrent shoulder instability. Both soft tissue lesions as bony glenoid lesions can be visualised. High intra and inter-observer correlations show that MRI-arthro is reliable and valid for measuring bony defects of the glenoid.

Search ShoulderDoc.co.uk

Find a Shoulder Professional

+ Add Your Clinic Advanced Search

This website is certified by Health On the Net Foundation. Click to verify. This site complies with the HONcode standard for trustworthy health information:
verify here.

ShoulderDoc.co.uk satisfies the INTUTE criteria for quality and has been awarded 'editor's choice'.

The material on this website is designed to support, not replace, the relationship that exists between ourselves and our patients. Full Disclaimer