Blood is drawn from the patient and placed in special vials prvent clotting.This blood is then put through a centrifuge process.The portion of the blood that is rich in growth substances is then injected into the part of the body that is problematic.This method is quite effective in treating problems such as knee,shoulder,ankle,wrist,elbow,buttocks joints cartilage dysfunctions,calcification and muscle and tendon wounds.When applied by proffessional and competent doctor,the risk of side effects is extremely low.The quality of the vials used is quite important.If cheap and low quality vials are used effectiveness will be quite low.