Palmer devised a classification system to guide treatment of triangular fibrocartilage complex tears in 1989. The main division is between traumatic Type I and atraumatic Type II tears. The wrist arthroscopy makes diagnosis and treatment of ulnar impaction syndrome possible in a less invasive way. Arthroscopy is the most valuable tool for diagnosis and treatment of acute scapholunate and lunotriquetral dissociation. Arthroscopic grading of Kienböck's disease better describes articular damage compared with plain radiographs and can help surgical treatment. The wrist arthroscopy generally makes it possible to make the diagnosis of the chondral lesion before they are visible by the usual imaging.