Arthroscopy of the knee joint is an essential diagnostic procedure of the knee joint lesions because of its high diagnostic accuracy, simple procedure, high safty and low morbidity. We applied arthroscopy in the diagnosis of 62 patients with pain, swelling, limitation of motion and giving way of the knee joint from Jan. 1987 to Dec. 1991 at Ewha Womans University Hospital. Only 49 patients of these were followed over 6 months and we analysed and compared with clinical diagnosis and rthroscopic findings.

The results were follows :

1) Patients with knee joint lesions were most common in 3rd and 4th decades.

2) Patients with traumatic history were 57.1% (28 patients).

3) Most common lesions were meniscal lesion and most commonly used method of treatment after arthroscopy was meniscectomy.

4) Three patients with internal derangement of knee were diagnosed meniscal injury after arthroscopy.