The invention provides improved instruments and related methods for percutaneously delivering a revision implant to a surgical site in a spine of a patient having an existing implant installed therein. In one aspect, a percutaneous delivery instrument is provided with an inner shaft with a threaded portion at its distal end to engage a percutaneous revision implant, an outer sleeve with a hollow cavity, hinges, and features to engage the percutaneous revision implant at its distal end, and a translator in which the outer sleeve is disposed. The percutaneous delivery instrument may be employed to deliver and install a percutaneous revision implant to extend the existing implant such that it spans additional portions of the spine.
