By attaching the arthroscope to a miniature television digital camera, the surgeon is able to see the interior in the joint through this very small incision in lieu of a large incision required for surgery.  I've a video demonstrating a set of those sufferers but I are unable to show https://www.theorthopaedicandpainpractice.com/unlocking-the-mystery-of-knee-replacement-surgery-everything-you-need-to-know/