Severe atrophy and fatty degeneration of the infraspinatus muscle due to isolated infraspinatus tendon tear |
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Authors: | Kolbe Amy B Collins Mark S Sperling John W |
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Institution: | (1) Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA;(2) Department of Orthopedic Surgery, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA |
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Abstract: | Atrophy of both the supraspinatus and infraspinatus muscles is usually caused by chronic rotator cuff tear, but may also derive
from suprascapular nerve entrapment at the spinoglenoid notch. Isolated infraspinatus muscle atrophy is uncommon, and typically
associates with suprascapular nerve entrapment occurring distal to the spinoglenoid notch. However, isolated atrophy of the
infraspinatus muscle due to insertional tear of the infraspinatus tendon may also occur. We present a case of a 43-year-old
male with isolated infraspinatus muscle atrophy and fatty degeneration following an isolated full-thickness infraspinatus
tendon tear at the insertion site on the humerus. While it is important to rule out other causes of infraspinatus muscle atrophy,
such as concomitant rotator cuff tendon/muscle pathology or suprascapular nerve palsy, we present this case to increase awareness
of this uncommon clinical presentation and the potential implications for treatment. |
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