MRI ROTATOR CUFF: SUPRASPINATUS OR INFRASPINATUS TEAR? How to differentiate supraspinatus from the infraspinatus tendons at their insertion:
Today’s video in our Online Learn MSK MRI series is on MRI of the Shoulder and we will be looking at a problem people have with MRI of the rotator cuff tendons and that is, how to differentiate supraspinatus from the infraspinatus tendon at their insertion.The problem is that there is no plane between supraspinatus and infraspinatus as they insert into the greater tuberosity and it can get confusing trying to work out is it a supraspinatus tear or an infraspinatus tear. So when you see a rotator cuff tear on MRI how do you work out which tendon is involved?
Today’s video where we will be looking at how to differentiate on MRI supraspinatus from infraspinatus tendons at their insertion. On MRI Rotator Cuff its difficult at times to work out if a tear is in the supraspinatus or infraspinatus.
This 5 minute video below looks at how to differentiate supraspinatus from the infraspinatus tendon at their insertion.
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You need to use the anatomy of the facets of the greater tuberosity to help you. The greater tuberosity has 3 facets, Horizontal, Oblique and Vertical.
Supraspinatus inserts onto the horizontal facet particularly the anterior 2/3rds. Infraspinatus inserts onto the Oblique Facet and a variable amount onto the posterior 1/3rd of the horizontal facet. The posterior 1/3rd of the horizontal facet is the region where the fibres of SST and IST mix, the conjoint tendon area. See the video to have a full explanation of it.