Traumatic supraspinatus injury
Fall on the abducted arm. Painfully restricted motion.
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Partial tear of the supraspinatus tendon at the myotendinous junction. No signs of degeneration or muscular atrophy.
Traumatic stress on healthy tendons typically leads to bony avulsions or myotendinous junction injuries, as in this case. Tears of the tendon itself usually involve some degree of degeneration.