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. 2018 Nov 5;131(21):2589–2598. doi: 10.4103/0366-6999.244111

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Copyright: © 2018 Chinese Medical Journal

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The three-pillar theory of the femoral head and China-Japan Friendship Hospital classification system are shown. According to the involved site of the necrotic lesion, ONFH can be classified as a medial (M) type (only medial pillar involved), central (C) type (medial and central pillars involved), and lateral (L) type (lateral pillar involved). This L type is further divided into an L1 type (partial lateral pillar preserved [sublateral]), L2 type (the lateral pillar involved only [extralateral]), and L3 type (all three pillars involved). ONFH: Osteonecrosis of the femoral head.