An interbody spinal implant (1) including a body, the body comprising: a top surface (10)； a bottom surface (20)； opposing lateral sides (30)； and opposing anterior and posterior portions (40,50)； the top surface, bottom surface, opposing lateral sides, internal wall surface, and opposing anterior and posterior portions defining a substantially hollow center having a single vertical aperture (60) defining an internal wall surface (36), the single vertical aperture (a) extending from the top surface to the bottom surface, (b) having a size and shape predetermined to maximize the surface area of the top surface and the bottom surface available proximate the anterior and posterior portions while maximizing both radiographic visualization and access to the substantially hollow center, and (c) defining a transverse rim (100), wherein at least a portion of the internal wall surface has a roughened surface topography.
