What is the functional anatomy of impingement relative to supraspinatus tendonitis?

Updated: Dec 03, 2018
  • Author: Thomas M DeBerardino, MD; Chief Editor: Sherwin SW Ho, MD  more...
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Impingement implies extrinsic compression of the rotator cuff in the supraspinatus outlet space. Bigliani and associates discovered and described that variations in acromial size and shape can contribute to impingement. From cadaveric studies, 3 different variations in the morphology of the acromion are described. Type I is flat, type II is curved, and type III is anteriorly hooked. Although the curved configuration is the most common (43% prevalence, compared with 17% for flat and 40% for hooked), the hooked configuration is associated most strongly with rotator cuff pathology.

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