A modular part-spherical acetabular reamer including a first part-spherical element having an outer surface including a pole and a portion extending from the pole toward an equator of the reamer to a point intermediate the pole and the equator. The reamer also includes a second part-spherical element having an outer surface extending from the intermediate point towards the equator. Further, the reamer includes means for releasably coupling the first and second portions to form the modular part-spherical reamer.