Chronic or stable slipped capital femoral epiphysis (SCFE) is a lesion of t
he hip, affecting the adolescent patient through adulthood. The change in t
he shape of the femoral head and to the biomechanics of the hip joint leads
to early osteoarthritis. Treatment of SCFE is designed to stop slip progre
ssion to reduce the degree of osteoarthritis. Complications, such as avascu
lar necrosis and chondrolysis, may also cause osteoarthritis. In situ pinni
ng of SCFE is considered the best treatment modality currently available. I
n situ pinning of SCFE has the advantages of effectiveness, low morbidity,
and a low complication rate. These advantages outweigh the disadvantage of
fusing the slip in the uncorrected position. The authors review the indicat
ions, the techniques of in situ pinning, the results, and the complications
of the procedure. The technique of in situ pinning necessitates experience
and understanding of the anatomy of the adolescent hip, as well as adequat
e imaging equipment.