A vertebral implant comprises a tubular body sized to fit between two vertebral endplates and a pair of ring-shaped cleat assemblies. Each cleat assembly comprises an outer end wall, an inner end wall, and a side wall which defines a hollow bore. One or more spikes extend from each outer end wall, and each hollow bore is sized to fit over an end of the tubular body and slidably pass from the end along at least a portion of the length of the tubular body.