This is a cadaveric anatomical study of 40 shoulders examining how rotator cuff tears delaminate. It dissects the supraspinatus and infraspinatus insertions to define the plane along which the tendon splits. The goal is to build a pathomechanical model explaining why articular-side degenerative tears are so common.
When you look at a delaminated cuff arthroscopically, the split is not random — it follows a consistent plane between a capsuloligamentous articular layer and a tendinous bursal layer.
Knowing which structures sit in each layer changes your repair. The articular layer carries the rotator cable/crescent complex and joint capsule, while the bursal layer is the tendon proper. A dual-layer repair aims to restore both.
The model explains a board-relevant fact: articular-side tears dominate (reported at 91%) because that layer is thinner, cross-interlaced, and mechanically weaker, so it fails first under tension. The proposed cascade is worth memorizing: degeneration starts at the supraspinatus-infraspinatus overlay, extends into the thin rotator crescent, then becomes full-thickness.
Remember this is a cadaveric study of 40 elderly shoulders (mean age 75) with no clinical outcome correlation, so the etiologic model is anatomically grounded but not yet outcome-validated.
This is a cadaveric anatomical study of 40 shoulders examining how rotator cuff tears delaminate. It dissects the supraspinatus and infraspinatus insertions to define the plane along which the tendon splits. The goal is to build a pathomechanical model explaining why articular-side degenerative tears are so common.
When you look at a delaminated cuff arthroscopically, the split is not random — it follows a consistent plane between a capsuloligamentous articular layer and a tendinous bursal layer.
Knowing which structures sit in each layer changes your repair. The articular layer carries the rotator cable/crescent complex and joint capsule, while the bursal layer is the tendon proper. A dual-layer repair aims to restore both.
The model explains a board-relevant fact: articular-side tears dominate (reported at 91%) because that layer is thinner, cross-interlaced, and mechanically weaker, so it fails first under tension. The proposed cascade is worth memorizing: degeneration starts at the supraspinatus-infraspinatus overlay, extends into the thin rotator crescent, then becomes full-thickness.
Remember this is a cadaveric study of 40 elderly shoulders (mean age 75) with no clinical outcome correlation, so the etiologic model is anatomically grounded but not yet outcome-validated.