Fig. 6
From: A novel animal model of osteonecrosis of the femoral head based on 3D printing technology
External morphology of the femoral heads in each group. A The femoral head in the A1 group: complete collapse with accompanying bone defect (red arrow); B the femoral head in the A2 group: significant cartilage loss and minor femoral head collapse (black arrow); C the femoral head in the A3 group: localized cartilage defect (blue arrow); D the femoral head in the A4 group: minor cartilage delamination (yellow arrow); E the femoral head in the B1 group; F the femoral head in the B2 group