Open reduction for developmental dislocation of the hip (DDH) is invasive and sometimes results in femoral head deformity while open reduction has been the first choice in case non-operative reduction is failed in.

We treated 3 patients with 3 affected hips using minimum invasive arthroscopic reduction method. Pre-operative MRIs represented these 3 hips had obstruction of interposed thick limbus. The average age of patients treated by this method was 23 months.

This method consists of arthrogram, arthroscopic limboplasty, and arthroscopic reduction. This series of maneuvers was able to lead unreducable hips to the reduction position.

Post-operative MRIs represented that the interposed thick limbus had been removed to the outside of acetabulum and the limbus covered the reduced femoral head. There were no signs of residual subluxation of the hips in radiographic examination.

This new minimum invasive arthroscopic reduction method have a possibility to take the place of the invasive open reduction in the treatment of DDHs with obstruction of interposed thick limbus.