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(A–C) 3D CAD model (bottom, top and side view) of the three-layer osteochondral scaffold design with 60% in-fill density. SEM images of (D–E) control scaffolds without nHA (bottom and top images); and (F–I) osteochondral scaffolds with graded nHA (F is the bottom, G is the top; H is 10% nHA layer and I is 20% nHA layer).
