Arthroscopy is described as which of the following?

Arthroscopy is accurately described as a surgical procedure that allows healthcare professionals to view the inside of a joint. This minimally invasive technique involves the insertion of an arthroscope—a small camera attached to a thin tube—through a small incision. The camera transmits images of the joint to a monitor, giving physicians a clear view of the joint's inner workings, including cartilage, ligaments, and synovial tissues.

This method can aid in diagnosing joint issues, guiding treatment decisions, and performing certain surgical procedures, such as repairing damaged cartilage or removing loose fragments. The other options detail procedures and techniques that, while related to medical imaging or treatments, do not describe arthroscopy accurately; thus, 'A' stands out as the correct description of this specific surgical technique.