Abstract: A spinal implant includes a tapering box-shaped block made of a bone material; and at least one buttress ridge disposed on at least one surface of the tapering box-shaped block. A spinal implant bolt includes a shaft with a cylindrical body, the shaft having a leading end and a trailing end, wherein the trailing end has at least one slot for receiving a screw driver; and a buttress thread dispose on the shaft in a spiral configuration, wherein the buttress thread has a leading flank facing the leading end of the shaft and a trailing flank facing the trailing end of the shaft, the leading flank forms a smaller angle with a longitudinal axis of the shaft than an angle formed between the trailing flank and the longitudinal axis of the shaft, wherein the spinal implant bolt is made of a bone material.