Rathbun and Macnab used cadaveric microangiography with parallel histology to map the blood supply of every rotator cuff tendon. They asked whether the known avascular zone of the supraspinatus causes degeneration, results from it, or exists for a mechanical reason entirely.
Every time you repair a supraspinatus tear, you are working in a tendon that was already poorly vascularized before it ever tore.
The stump you are holding is not just torn — in all massive rupture specimens, most of the tendon proximal to the tear was avascular and degenerate. Approximating those edges is approximating dead tissue to bone.
The operative implication is direct: debride back to healthy, bleeding tendon before fixation. If that requires supraspinatus muscle advancement (detaching it from the supraspinous fossa as Debeyre described), the anatomy of its nerve and arterial supply makes that feasible.
The positional finding also has a practical takeaway: the avascular zone is worst with the arm at the side in neutral rotation. The position patients hold all day and sleep in. This paper is why we understand the supraspinatus as a tendon under chronic ischemic stress, not simply a tendon that wears out.
Rathbun and Macnab used cadaveric microangiography with parallel histology to map the blood supply of every rotator cuff tendon. They asked whether the known avascular zone of the supraspinatus causes degeneration, results from it, or exists for a mechanical reason entirely.
Every time you repair a supraspinatus tear, you are working in a tendon that was already poorly vascularized before it ever tore.
The stump you are holding is not just torn — in all massive rupture specimens, most of the tendon proximal to the tear was avascular and degenerate. Approximating those edges is approximating dead tissue to bone.
The operative implication is direct: debride back to healthy, bleeding tendon before fixation. If that requires supraspinatus muscle advancement (detaching it from the supraspinous fossa as Debeyre described), the anatomy of its nerve and arterial supply makes that feasible.
The positional finding also has a practical takeaway: the avascular zone is worst with the arm at the side in neutral rotation. The position patients hold all day and sleep in. This paper is why we understand the supraspinatus as a tendon under chronic ischemic stress, not simply a tendon that wears out.