A reamer arranged to ream a surface of a bone is provided. The reamer includes a guide portion having a non-reaming lower surface configured to slidably engage a corresponding guide reamed portion of the bone and an eccentric reaming lobe. The reaming lobe extends from part of the periphery of the guide portion. The reaming lobe has a reaming lower surface configured to ream bone outside of the guide reamed portion of the bone when the guide portion is rotated and urged towards the guide reamed portion of the bone. A second reamer may also be provided to form a reaming kit.
