I was having a slow recovery from a torn cartilage and stress fracture in my left knee. After 18-20 months of little to no improvement, I went to a seminar at Doctors Hospital given by Dr. Bennett. I made an appointment to see him in regards to my left knee. He recommended that I try the "PRP" injections, and after 2 injections I have had a 85-90% improvement. I would recommend trying the "PRP" injections before considering surgery.