Graft sizing block

A graft sizing block is a non‑sterile instrument used by surgeons to determine the appropriate size of a tendon graft, such as a patellar tendon, during anterior cruciate ligament reconstruction. It features a series of graduated holes and measurement markings that help select the correct tunnel diameter for the procedure.

These blocks are reusable devices that must be sterilized before each use and are typically classified as accessory surgical tools rather than implants. Their regulatory handling follows the rules for non‑sterile, reusable medical devices, with manufacturers required to provide instructions for proper cleaning and sterilization.