A clinical observation was made on 35 patients who were admitted to the Department of Orthopedic Sugery, Busan National University Hospital, 29 of whom had undergone operation from January 1979 to December 1983. The results obtained were as follows: 1. The peak incidence of age ranged from 51 to 60 years, which comprised 16 cases (45.7%) 2. The type of theDisease'were 15 cases with degenerative spinal stenosis, which comprised highest incidence, 11 cases with combined spinal stenosis, 6 cases with spondylolisthesis, 2 cases with idiopathic spinal stenosis and 1 case with iatrogenic spinal stenosis. 3. The duration of symptom before admisson ranged from 3 months to 20 years. Duration over 3 years comprised 54.3% of highest incidence. 4. The most common symptom on admission was pain in low back and leg, which comprised 31 cases (88.6%) and 4 cases had no specific neurologic deficit. 5. Myelogram was performed in 30 cases, C.T. scan in 7 cases and the most common myelographic finding was bilateral single level hour glass defect in 8 cases (26.7%). 6. Decompressive surgerys were done on 30 cases and post-operative results obtained were as follows: excellent in 11 cases (36.7%), good in 13 cases (43.3%), fair in 4 cases (13.3%) and poor in 2 cases (6.7%).