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A: Preoperative magnetic resonance image showed ARCO stage IIb/CJFH Type C (the right hip) and ARCO stage IIc/CJFH Type L1 ONFH (the left hip); B: This Computed tomography scan was performed at five years after the impacted bone grafting alone (without addition of BMP2) and showed the femoral head maintained its spherical shape an incomplete repair for the necrosis with the residual lesion at the subchondral bone of the femoral head.
