Cortisone injections have lots of negative effects:
From the medical perspective:
Corticosteroids cause a number of side effects which can be limited to the area injected or affect the entire body. Side effects increase with larger doses and repeated clinical use. For this reason, physicians may limit the number of injections and the cumulative amount of corticosteroid that is given. Typically, corticosteroid injections are not given more often than every six weeks, and usually not more than three or four times a year. But these are only guidelines. A patient’s situation dictates the timing and frequency of treatment.
Side effects may include weakening of the joint, increased blood pressure, elevation of blood sugar, and decreased ability to fight infection. Evidence of these side effects should be reported to the doctor monitoring the condition.
And this:
Closer scrutiny of symptomatic treatment suggests that the provision of transient relief of symptoms may have caused more harm than good. Cortisone injections provide a trade-off of short-term relief for poorer long-term outcomes.
I had a lot of medical references in the old forum. Unfortunately we were not able to port those posts to the new site. Do you need or want more than this?