A cadaveric study of 22 (18 analyzed) elderly shoulders asking whether the different acromial shapes are congenital or acquired. Unlike prior work, it used macroscopic, radiographic, AND histologic examination. The goal was to see if flat, curved, and hooked acromions differ in tissue changes at the coracoacromial ligament attachment.
When you see a hooked acromion on an outlet view, do not assume you are looking at a congenital bone shape that caused the cuff tear. This histologic study makes the opposite case: the hook is a traction enthesophyte at the coracoacromial ligament, driven by superior humeral migration in an already failing cuff.
That reframes acromioplasty. If the hook is a response to cuff dysfunction rather than the primary driver, shaving bone treats a marker, not the root problem, and the cuff itself still needs attention. The chicken-or-egg question from Morrison and Bigliani, whether hooking causes impingement or results from it, is exactly what this paper tackles, and it lands on acquired.
Remember the design limits: 18 embalmed acromions, all from patients over 60 with universally degenerate cuffs, and a subjective histologic grading scale. It supports a mechanism; it does not prove causation in living patients.
A cadaveric study of 22 (18 analyzed) elderly shoulders asking whether the different acromial shapes are congenital or acquired. Unlike prior work, it used macroscopic, radiographic, AND histologic examination. The goal was to see if flat, curved, and hooked acromions differ in tissue changes at the coracoacromial ligament attachment.
When you see a hooked acromion on an outlet view, do not assume you are looking at a congenital bone shape that caused the cuff tear. This histologic study makes the opposite case: the hook is a traction enthesophyte at the coracoacromial ligament, driven by superior humeral migration in an already failing cuff.
That reframes acromioplasty. If the hook is a response to cuff dysfunction rather than the primary driver, shaving bone treats a marker, not the root problem, and the cuff itself still needs attention. The chicken-or-egg question from Morrison and Bigliani, whether hooking causes impingement or results from it, is exactly what this paper tackles, and it lands on acquired.
Remember the design limits: 18 embalmed acromions, all from patients over 60 with universally degenerate cuffs, and a subjective histologic grading scale. It supports a mechanism; it does not prove causation in living patients.