Forlin E et al. - Septic arthritis of the hip developed at the newborn period produced more severe sequelae. Hips with sequelae grade 1 have a good prognosis. Surgical procedures in these grades were necessary to correct acetabular dysplasia and improve congruency. Fifteen of 20 hips with sequelae grade 2 (unstable) underwent reconstruction. At a mean follow-up of 6.9 years (range, 2.7-11.3 years), satisfactory results were obtained in 8 of them. The classification the authors proposed showed to be simpler and more reliable than the classification proposed by Choi et al. It may be useful to guide treatment and prognosis. Longer follow-up is needed to assess the real benefit of the reconstruction for unstable hips.