Cortisone injections can seriously compromise the integrity of the muscles & supportive connective tissues around the area where you had the injection. Cortisol/Cortisone is catabolic, thats how it works.
http://www.medicinenet.com/cortisone_injection/page2.htm#5whatare
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http://www.medicinenet.com/cortisone_injection/page2.htm#5whatare