📌 Supraspinatus Anatomy and Hidden Supraspinatus Myotendinous Injuries
✅ Supraspinatus Anatomy
- The supraspinatus has anterior and posterior components, with the anterior bundle being five times larger.
- Anterior Bundle: Occupies the anterior supraspinatus fossa and attaches to the anterior superior facet of the greater tuberosity near the rotator cuff interval.
- Posterior Bundle: Smaller and located in the posterolateral supraspinatus fossa, adjacent to the scapular spine.
✅ Rotator Cuff Myotendinous Junction Injuries
Muscle Edema Pattern
- Edema appears as a target-like hyperintense region on T2-weighted imaging, typically surrounding the retracted myotendinous stump.
Longitudinal Section (Tadpole Sign)
- The “tadpole sign” represents the tendinous skeleton of the infraspinatus (caudal part) and the retracted tendon stump (cephalic part).
Sagittal Section (Black Eye Sign)
- The “black eye sign” shows the retracted stump as the iris, and the remaining infraspinatus fossa resembles the surrounding eye structure.
Supraspinatus Myotendinous Injuries
- Typically involve the anterior bundle of the muscle.
- This occurs due to higher contractile forces and the presence of long intramuscular tendons with a bipennate configuration.
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