 Namaskara, I am Dr. Merlina, the orthopedic surgeon working in Manipal Hospital, Bangalore. This surgery is usually done for the ligament injuries, cartilage damages and for removal of the foreign body, sometimes correction of the, some all problems in the joint and for the injection, so many conditions are there for which this keyhole surgery or arthroscopic surgery is done and it is commonly done in sports persons and in some accident cases also for the ligament reconstructions.