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Broken bones occur when a bone si hit with extreme force causing it to break.
possible causes: falling off a high building; getting hit by a semi-truck; having your older brother whack you in the arm with a baseball bat >.<
symptoms: excruciating pain in the bone; numbness; loss of concsiousness; etc.
Arthritis occurs between bones when there is not enough cartilage, or no, cartilage and the bones start touching eachother.
possible causes: you're old; you overuse the joint; hereditary
symptoms: excruciating pain in the joint; weakness in the joint; etc.
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