Platelet Rich Plasma (PRP) injections have become increasingly popular for treatment of a variety of soft tissue disorders. These include tendonitis, tendonosis, and partial tears of tendons. Early reports are quite promising.
The process involves taking a syringe full of the patients blood and spinning it in a centrifuge to concentrate the platelet portion in the plasma. This concentrate is then injected back in the patient. Sometimes, ultrasound is used to guide the needle into the injured tendon. Although tendon injections can be painful, they are not excessively painful. Patients often report a burning pain that occurs several hours after the injection.
However, the PRP injections have been very successful, so the good result may be woth the temporary pain.