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Radiology, Vol 190, 665-668, Copyright © 1994 by Radiological Society of North America

ARTICLES

Hill-Sachs lesion and normal humeral groove: MR imaging features allowing their differentiation

RD Richards, DJ Sartoris, MN Pathria and D Resnick
Department of Medicine, Mercy Hospital and Medical Center, San Diego, Calif.

PURPOSE: To present a method of differentiating Hill-Sachs lesions from the anatomic groove in the posterolateral humeral head with use of magnetic resonance imaging. MATERIALS AND METHODS: A 360 degrees reference about the humeral head was established to define the locations of Hill-Sachs lesions and the anatomic groove on transaxial images. The extension of each finding along the longitudinal humeral axis was noted. Eight cadaveric specimens were sectioned and similarly analyzed. RESULTS: The locations of Hill-Sachs lesions and the anatomic groove in the circular reference frame were statistically significantly different (P < .001), yet their respective ranges overlapped. Along the longitudinal humeral axis, there was no overlap between the respective ranges of location (P < .001). CONCLUSION: A Hill-Sachs lesion is best differentiated from the anatomic groove by means of its more cephalic position along the longitudinal humeral axis.


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