A measuring device (1) for measuring the length of a through-hole in a bone is provided comprising an elongated hollow sleeve (3) preferably having an outer cross-section adapted to a cross-section of the through-hole and having an opening (5) at its distal extremity. The measuring device (1) further comprises a bar (7) having a hook-end (9) at its distal extremity. The bar is at least partly housed within the hollow sleeve and is slidable with respect to the sleeve along its longitudinal axis. A sleeve and the bar are adapted such that, slid to a distal position of the sleeve, the hook-end can be displaced such as to protrude through the opening of the sleeve and laterally over the lateral surface of the sleeve, and such that, slid to a proximal position of the sleeve, the bar does not protrude laterally over the outer cross-section of the sleeve.
