We investigated 6 hips of 5 patients who were treated for slipped capital femoral epiphysis with cannulated screws. The age at operation was 11 to 13 (mean: 12.1 years). The duration of follow-up was 17 to 56 months (mean: 34 months). Physical closure after operation was observed at 22 to 40 months (mean: 29 months). We removed the screws in 5 of the 6 hips. The results were evaluated using the radiographic measurements of posterior tilt angle (PTA) and Jones' classification for remodeling of the capital femoral epiphysis. There were no severe complications such as avascular necrosis, chondrolysis, and osteoarthritis. The improvement of PTA was 0 to 21 degrees (mean: 10.3 degrees). Four hips were type A and two were type B by Jones' classification. We can conclude that in situ pinning is useful for slipped capital femoral epiphysis.