An arthroscope is a 5-mm diameter rod-shaped optical instrument for viewing the internal structure of a joint, and is an endoscope used by physicians to diagnose and treat joint disorders. The arthroscope, which has been used since 1970, has a lens at the end of a thin tube, which is inserted into the joint and the internal structure of the joint is displayed on a monitor. As a result, the structures inside the joint can be directly observed. Arthroscopic surgery is performed by cutting several “chopstick” sized or smaller holes (5-10 mm) in the skin, inserting a camera and surgical instruments into the joint, and having the surgeon operate under the monitor to diagnose and treat various joint diseases. At present, the joints that can be treated abroad include: knee, shoulder, ankle, elbow, wrist, jaw, hip, metacarpophalangeal joint, and even thoracic and lumbar joints.