Although they can provide immediate pain relief for soft-tissue injuries such as tennis elbow and Achilles tendinopathy, the shots can slow healing over the long term, according to a number of new studies. A comprehensive review of the available research published last year found that people who’d received cortisone shots had a much lower rate of full recovery than those who’d done nothing at all. Plus, they had a 63 percent higher risk of relapse.
Missing link: Trying to figure out exactly what’s going on inside overtaxed tendons and ligaments. In fact, scientists don’t fully understand the mechanics of injuries like tennis elbow and Achilles problems, so they don’t know how best to treat them—except to say that cortisone shots don’t appear to do the trick.