A chisel-like, one-piece manual surgical instrument designed to cut and/or shape bone by percussion during an orthopaedic procedure. It is hand-held by the operator who uses a surgical mallet or hammer to manually impart a force to the proximal end of the instrument. The distal end (the cutting or shaping edge) is sharp, often flat, but can be curved (concave) in design, and is typically bevelled on both sides with sloping curves. It is either entirely made of metal (e.g., high-grade stainless steel) or has a metal blade with a handle made of synthetic material (e.g., Tufnol). This is a reusable device.