Most common orthopedic surgery may not help at all according to the findings of a new study. ABC News reports minimally invasive surgery to repair torn cartilage in the knee is performed some 700-thousand times each year in this country but researchers in Finland found, after one year, there was no difference in pain. The scientists staged fake surgeries in real operating rooms and compared the results to legitimate surgeries. After one year there was no difference in knee pain after exercise and no difference in the number of patients who needed more surgeries for the same problem. If the results hold up some experts take it to mean a four billion dollar elective surgery industry is unnecessary.