Wang Y, Yamako G, Okada T, et al. - This study was undertaken to explore the influence of curved varus osteotomy (CVO) on the stress reduction in necrotic bone using a finite element analysis (FEA) with different center-edge (CE) angles. In this study, CVO finite element models of the hip joint were simulated with a lesion of 60°. Researchers classified osteotomy angles into four configurations (15°, 20°, 25°, and 30°), and three types (A, B, and C1) of lesions were established based on the Japanese Investigation Committee (JIC) classification. A CVO angle of > 20° was recommended for type B and > 30° was safe for type C1 for making decisions about the biomechanics of CVO. It was shown that the risk of progressive collapse was elevated in the insufficient situation of the weight-bearing portion after CVO. After CVO, the intact ratio could provide information about clinical outcomes and stress distribution.