Fig. 1From: Hydroxyapatite/collagen composite graft for posterior lumbar interbody fusion: a comparison with local bone graftScanning electron microscopy (SEM) demonstrates a highly porous structure of the hydroxyapatite/collagen composite (pore size: 100ā500Ā Ī¼m, porosity: 95%) (A). High magnification demonstrates macropores and micropores (B)Back to article page