Anterior discectomy and fusionBone graft substituteCellular bone matrixDemineralized bone matrixHydroxyapatiteMesenchymal stem cellPosterior spinal fusionspinal TricalciumLUMBAR INTERBODY FUSIONANTERIOR CERVICAL DISKECTOMYSTEM-CELLSMORPHOGENETIC PROTEINSOUTCOMESALLOGRAFTCOMPLICATIONSSURGERYDIFFERENTIATIONHYDROXYAPATITE