Be wary of cortisone injections. They are a steroid. I had to take a steroid (Prednisone) once for an inflamed colon. I felt the aging effects. That's what steroids do: they age the body's connective tissue.
Yes, cortisone injections are more concentrated than Prednisone. However, cortisone injections administer a high concentration of a substance that is normally found only in small concentrations in your body. Laboratory studies have shown that high concentrations of cortisone or repetitive use of the medication can lead to damage of the tissues in the body. This may lead to softening of the cartilage in joints or weakening of the tendons.