Fig. 1
From: The effect of the necrotic area on the biomechanics of the femoral head - a finite element study
Schematic diagram of China-Japan Friendship Hospital (CJFH) classification for osteonecrosis of the femoral head (ONFH). a MRI of CJFH classification for ONFH based on three pillars structure. Type M: the necrosis involved the medial pillar. Type C: the necrosis involved both medial and central pillars. Type L1: the necrosis involved the three pillars but the partial lateral pillar was preserved. Type L2: the necrosis involved the whole lateral pillar and partial central pillar. Type L3: the necrosis involved the three pillars including the cortical bone and marrow. b Five three-dimensional CJFH classification models of ONFH. The necrotic area of the femoral head was shown in red