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Arthroscopy was performed in five hips with slipped capital femoral epiphysis (SCFE) before pinning in situ. Arthroscopy disclosed erosion of acetabular cartilage in the anterosuperior region and damage to the posterolateral aspect of the acetabular labrum. Cartilaginous erosion and transverse cleft were identified on the anterior surface of the femoral head. These findings support the hypothesis that all pathomechanisms of SCFE are caused by traumatic factors. Arthroscopy for SCFE is also clinically useful in reducing hip pain. Arthroscopy performed simultaneously with pinning in situ can permit early exercise of the joint.