Blocker’s Exostosis (Arm Exostosis)

Blocker’s Exostosis (Arm Exostosis)



Description


An exostosis is a benign bony reaction to repeated injury that occurs at the site of repeated injury, usually direct blows. Blocker’s exostosis is an overgrowth of bone in the upper arm (humerus).



Common signs and symptoms



• Occasionally asymptomatic

• Pain, tenderness, and sensitivity of the upper arm at the site of the exostosis, worsened by pressure or minor injury to the area

• Change in contour of the arm, either visible or detectable by touch, depending on the size of the exostosis and ranging from a small lump or bump to a large spur on the humerus

• Uncommonly, a feeling of a movable piece within the arm when the spurs break off the humerus

• Occasionally, swelling or bruising with repeated injury


Causes



• Repeated injury (contusions, sprains, or strains) that involve the upper arm (humerus)

• Chronic irritation to an already damaged bone area


Factors that increase risk



• Contact sports, particularly football or rugby, or other sports that require blocking with the arms

• Other sports with potential for direct blows to the arms, such as martial arts

• Poor muscle strength or conditioning

• It is possible to be born with this condition (osteochondroma).


Preventive measures



• Wear proper protective equipment, and ensure correct fit for arm pads.

• Allow adequate time for recovery from any arm injury.

• Maintain appropriate conditioning, including flexibility and strengthening of the muscles of the arm.
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Jul 18, 2016 | Posted by in SPORT MEDICINE | Comments Off on Blocker’s Exostosis (Arm Exostosis)

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