Patent ID: 8192453

Claim:
A surgical debridement instrument for hip or shoulder joint arthroplasty comprising: a support member with a boss rotatable by a powered driver about a longitudinal axis and support arms extending radially from the boss, the arms having downwardly depending teeth extending away from the driver and oriented parallel to the axis, respectively, generating a circular cutting profile as the tool is rotated about the axis; an elongated obturator having opposed proximal and distal ends, an upper end engaging the boss to center the cutting profile and a lower end having a first connecting element for mating with an impactor connecting element formed within the apex of an implanted acetabular or glenoid cup component that defines a rim, axially spacing the support member from the distal end whilst aligning the obturator with the axis; and wherein the teeth have inboard faces that tangentially superpose over an outer diameter of the cup rim as the tool is rotated to generate the cutting profile, shearing osteophytes and excess soft tissue surrounding the rim without marring the outer diameter of the cup rim.