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Hi and thanks for the query.
Cortisone shot can relieve the pain within 48 hours if they are given properly and if the disease responds to them. If however, the disease is non responsive, even if the shot is given properly, does not worsen the disease.
But in the event the shot is given erroneously - technical error, injection given in the wrong plane, allergic reaction within the joint causing inflammation, injection resulting in a hematoma etc can all worsen the disease.
And sometimes, the disease process itself is aggravating and one can relate this to the injection.
At this point in time, I would suggest that you make mention of this to your doctor and have an MRI of the sacroiliac joint done to rule out any of the above, initiate treatment if required to prevent any long term damage and halt disease progression.
Hope this helps.
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