Background and introduction: Our work aimed to compare and evaluate CT arthrography
(CTA) and MR arthrography (MRA) techniques in diagnosing glenohumeral joint instabilities,
also help the clinician to choose the ideal diagnostic modalities CTA & MRA either separately or
combined to reach the early and accurate diagnosis of glenohumeral joint instability.
Patient and methods: The study included 96 patients: 72 males, 24 females. Their age ranged from
14 to 51 years (mean =33), complaining of shoulder dislocation whether traumatic or nontraumatic
with glenohumeral instability.
For every patient, intra-articular contrast injection was done followed by CT and MRI arthrography
(CTA & MRA).
Results: Preliminary results showed the role of CTA & MRA in diagnosing the causes of instability.
Correlation between CTA and MRA may have a role in more accurate diagnosis of glenohumeral
instability.
Conclusion: The combination of CT arthrography and MR arthrography is a promisable one in
defining the type of instability.

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