High-Energy Extracorporeal Shock Wave for Early Stage Osteonecrosis of the Femoral Head: A Single-Center Case Series

Figure 2

Schematic diagram and MRI of China-Japan Friendship Hospital (CJFH) classification for osteonecrosis of the femoral head based on three pillars [20]. 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 whole lateral pillar and partial central pillar. Type L3: the necrosis involved the three pillars including the cortical bone and marrow.