The researchers who did publish this report conducted a randomized, controlled trial on steroid injections for tennis elbow. They gave 43 patients a steroid injection and 40 patients a placebo injection. They gave both groups physical therapy.
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Please don't get steroid injections for local tendon, ligament pain, or into your joints. You have a far better alternative - Prolozone. Prolozone is a simple injection of risk-free oxygen/ozone gas into the joint. I've seen it work miracles. You can see them too.