An interbody spacer for spinal fusion surgery, the interbody spacer comprising: first and second opposite longitudinal end portions (12,14) wherein a longitudinal axis of the interbody spacer extends through the first and second opposite end portions; first and second opposite side walls (16,18) extending longitudinally between and interconnecting the first and second longitudinal end portions, wherein the first and second opposite side walls define a width of the interbody spacer therebetween, the first and second opposite side walls having interior and exterior surfaces; upper and lower faces at respective upper and lower portions of the corresponding first and second opposite longitudinal end portions and first and second opposite side walls, wherein the upper and lower faces define a height of the interbody spacer therebetween; and an interior cavity defined by the first and second opposite longitudinal end portions and the interior surfaces of the first and second opposite side walls, wherein the interior cavity extends through the upper and lower faces, wherein each of the first and second opposite side walls includes open-cell metal foam at the upper and lower faces, and a three-dimensional lattice disposed between the open-cell metal foam at the upper and lower faces, wherein the open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. first and second opposite longitudinal end portions (12,14) wherein a longitudinal axis of the interbody spacer extends through the first and second opposite end portions; first and second opposite side walls (16,18) extending longitudinally between and interconnecting the first and second longitudinal end portions, wherein the first and second opposite side walls define a width of the interbody spacer therebetween, the first and second opposite side walls having interior and exterior surfaces; upper and lower faces at respective upper and lower portions of the corresponding first and second opposite longitudinal end portions and first and second opposite side walls, wherein the upper and lower faces define a height of the interbody spacer therebetween; and an interior cavity defined by the first and second opposite longitudinal end portions and the interior surfaces of the first and second opposite side walls, wherein the interior cavity extends through the upper and lower faces, wherein each of the first and second opposite side walls includes open-cell metal foam at the upper and lower faces, and a three-dimensional lattice disposed between the open-cell metal foam at the upper and lower faces, wherein the open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam. open-cell metal foam at the upper and lower faces, and a three-dimensional lattice disposed between the open-cell metal foam at the upper and lower faces, wherein the open-cell metal foam is in communication with the three-dimensional lattice so that bone growth can enter the three-dimensional lattice from the open-cell metal foam.