A study from the University of Tennessee reports the use of blood injections for tennis elbow. The idea is to stimulate healing at the cell level. The blood contains chemicals to help the immune system start the healing process.
Most patients report complete relief of painful symptoms within three weeks of the first injection. This matches the time period for tissue healing. A few patients need a second injection. This is given two weeks after the first injection. A positive effect is noted one to two weeks later.