Blood will be taken, centrifuged for 10-15 minutes and a small fraction of it (the platelet and growth factor rich phase, 5-10x as much as in whole blood) will be injected into a joint or around a tendon for longer lasting pain relief in acute and chronic pain conditions (e.g. damaged cartilage in the knee or inflammation of tendons, such as tennis elbow). The treatment may be repeated every few weeks for up to 3-6 times.