An instrument is provided for controlling the distribution of bone cement on a surface of a prepared bone so as to prepare the bone to receive a resurfacing prosthesis. The instrument includes a shaft having a shaft axis configured to at least partially disposed within the bore of the bone, and at least one arm coupled to the shaft. The at least one arm is configured to rotate about the shaft axis and shaped so as to contact the cement on the bone when the at least one arm is rotated about the shaft axis.
