Abstract: A prosthetic implant measurement device includes a template adapted to fit over an implant site and shaped to conform to a desired post-surgical result and an expandable bladder adapted for insertion into the implant site. The template has at least two holes for passing a catheter attached at one end to the bladder from within the implant site to a supply of fluid for filling the bladder and expanding the implant site. A method of measuring a prosthetic implant includes inserting the bladder into the implant site, passing the catheter through a catheter hole, and fitting the template to the patient at the implant site. The bladder is then filled until the implant site conforms to the template. The volume of fluid required to so fill the bladder corresponds to the volume of the prosthesis required to achieve the desired surgical outcome.