A pneumatic surgical instrument, comprising: a striker; a removable probe mountable on a distal end of the instrument; a pressure regulator operably connectable to a gas cartridge mountable on or in the instrument, and a trigger mechanism comprising a trigger, the trigger mechanism being operably connected to the pressure regulator and to the striker; wherein the probe has a distal end configured and shaped to engage or to be secured in or on a probe engagement feature disposed: (a) in or on an orthopedic implant; or (b) in or on an orthopedic implant impactor configured to matingly engage the orthopedic implant, the instrument being configured to deliver at least one shock wave to the probe when the trigger is actuated by a user and a predetermined volume of gas stored at a predetermined range of pressures in the instrument is released thereby to cause the striker to move towards the distal end of the instrument and deliver the shock wave to a proximal end of the probe and thence into the orthopedic implant or into the orthopedic implant impactor and the orthopedic implant, the surgical instrument being configured to drive the orthopedic implant at least partially into a void or hole formed in a patient's bone, the instrument being configured such that the shockwave delivered by the probe is substantially repeatable when the trigger is thereafter actuated by the user such that the instrument is configured to cause the orthopedic implant to engage at least portions of the void or hole in the bone, characterized in that the distal end of the probe is threaded and configured to threadably engage at least one of the probe engagement feature of the orthopedic implant and the probe engagement feature of the impactor. a striker; a removable probe mountable on a distal end of the instrument; a pressure regulator operably connectable to a gas cartridge mountable on or in the instrument, and a trigger mechanism comprising a trigger, the trigger mechanism being operably connected to the pressure regulator and to the striker; wherein the probe has a distal end configured and shaped to engage or to be secured in or on a probe engagement feature disposed: (a) in or on an orthopedic implant; or (b) in or on an orthopedic implant impactor configured to matingly engage the orthopedic implant, the instrument being configured to deliver at least one shock wave to the probe when the trigger is actuated by a user and a predetermined volume of gas stored at a predetermined range of pressures in the instrument is released thereby to cause the striker to move towards the distal end of the instrument and deliver the shock wave to a proximal end of the probe and thence into the orthopedic implant or into the orthopedic implant impactor and the orthopedic implant, the surgical instrument being configured to drive the orthopedic implant at least partially into a void or hole formed in a patient's bone, the instrument being configured such that the shockwave delivered by the probe is substantially repeatable when the trigger is thereafter actuated by the user such that the instrument is configured to cause the orthopedic implant to engage at least portions of the void or hole in the bone, characterized in that the distal end of the probe is threaded and configured to threadably engage at least one of the probe engagement feature of the orthopedic implant and the probe engagement feature of the impactor.