Relatively small, triangular, the anteromedial footprint of the supraspinatus tendon at the superior facet and a comparatively large, trapezoidal footprint of the infraspinatus tendon occupying the anterolateral portion of the superior facet and the entire middle facet.
The footprint of the supraspinatus had a triangular shape, which tapered away from the joint capsule.
The footprint of the infraspinatus was shaped like a trapezoid, which was wider laterally compared with the more medial insertion along the joint capsule.
The anterior part of the infraspinatus partially covered the posterolateral part of the supraspinatus.
Mochizuki et al. demonstrated that only the most anterior 1.3 mm of the rotator cuff footprint is purely occupied by the supraspinatus tendon.
From this point, the next 11.3 mm of the tendon insertion, on average, comprises the supraspinatus medially and the infraspinatus laterally
Our anatomical findings suggest that there may be a higher frequency of involvement of the infraspinatus in rotator cuff tears, which can explain the development of infraspinatus atrophy without suprascapular nerve damage.
The supraspinatus was also inserted into the lesser tuberosity (in addition to the greater tuberosity) in twenty-four (21%) of the 113 shoulders.
J Bone Joint Surg Am. 2008 May;90(5):962-9.
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