This cadaveric study asked whether hypovascularity in the distal supraspinatus tendon really explains why the rotator cuff tears there. Using quantitative histology rather than perfusion alone, the authors measured vessel number, size, and area across supraspinatus and infraspinatus. The goal was to test the long-standing 'critical zone' vascular theory of cuff rupture.
The 'critical zone' vascular theory dominated thinking on why the cuff tears where it does, and this paper directly challenges it. The logic is a controlled within-specimen comparison: if hypovascularity drives rupture, the equally hypovascular infraspinatus should tear as often as supraspinatus. It does not.
That pushes the pathogenesis conversation toward degeneration, impingement, and mechanical load rather than blood supply alone. There is a practical repair pearl too. Because tissue becomes more vascular beyond 20 mm from the insertion, debriding back to healthier proximal tendon may give a better-vascularized edge for healing.
Remember this as a counterpoint to vascular dogma: perfusion failure is not the same as true hypovascularity, and histology is needed to prove it.
This cadaveric study asked whether hypovascularity in the distal supraspinatus tendon really explains why the rotator cuff tears there. Using quantitative histology rather than perfusion alone, the authors measured vessel number, size, and area across supraspinatus and infraspinatus. The goal was to test the long-standing 'critical zone' vascular theory of cuff rupture.
The 'critical zone' vascular theory dominated thinking on why the cuff tears where it does, and this paper directly challenges it. The logic is a controlled within-specimen comparison: if hypovascularity drives rupture, the equally hypovascular infraspinatus should tear as often as supraspinatus. It does not.
That pushes the pathogenesis conversation toward degeneration, impingement, and mechanical load rather than blood supply alone. There is a practical repair pearl too. Because tissue becomes more vascular beyond 20 mm from the insertion, debriding back to healthier proximal tendon may give a better-vascularized edge for healing.
Remember this as a counterpoint to vascular dogma: perfusion failure is not the same as true hypovascularity, and histology is needed to prove it.