Arthroscopy under spinal anethesia seems to be too much effort for diagnostic purposes only. We carried out arthroscopy as outpatient examination under local anesthesia in 128 knees. Preparation, technique, complication and problems of this procedure are disscussed. Some patients felt pain on arthroscopy but the patients tolerated arthroscopy well. No severe complication was encounted. It was convinced that accuracy is not diminished by performing arthroscopic examinations under local anesthesia on outpatient. Outpatient arthroscopy is useful to try for early diagnosis and therapy.