Fujii M, Nakashima Y, Kitamura K, et al. - This study was carried out to ascertain if intra-articular lesions changed in short-term follow-up after periacetabular osteotomy (PAO) and whether the intra-articular lesion changes impacted the long-term survivorship of PAO. Between 1990 and 2001, researchers examined patients with hip dysplasia who had undergone PAO with arthroscopic observation. They enrolled patients who had undergone second-look arthroscopy. They examined a total of 64 patients (72 hips). They further conducted second-look arthroscopy was performed at a median of 1.4 years. This study’s findings imply that PAO prevents further deterioration in mild cartilage lesions and results in cartilage repair in some cases with advanced cartilage degenerations in the short-term. Nevertheless, these postoperative variations were not correlated with long-term survivorship. It has been reported that appropriate surgical indications based on the preoperative intra-articular cartilage degeneration are paramount to achieving long-term success in PAO.