Carstensen SE, Feeley SM, Burrus MT, et al. - This study was undertaken to investigate outcome data of patients undergoing DeJour sulcus-deepening trochleoplasty with medial patellofemoral ligament reconstruction (MPFLR) for high-grade trochlear dysplasia at a single institution in the United States. Between 2011-2019, researchers prospectively examined a sum of 67 patients (76 knees) with severe trochlear dysplasia and recurrent patellar instability and underwent DeJour sulcus-deepening trochleoplasty with MPFLR. They obtained radiographic analysis, physical examination, clinical follow-up, patient demographics, and patient reported outcome measures for all patients at each visit. A total of 40 patients (44 knees) were included who had complete two-year or longer follow-up. For recurrent patellar instability, DeJour sulcus-deepening trochleoplasty combined with MPFLR and applied with tibial tubercle osteotomy and lateral release was found to be a reliable and effective treatment due to severe trochlear dysplasia, even in this group with many revisions of prior procedures.