Abstract: A joint replacement system that includes an acetabular cup implant that has an outer surface, a drill bit that has a cutting surface, and a guide separately formed from the acetabular cup implant. The guide has a body that defines first and second guide openings each adapted to receive the drill bit. The system also includes void filler prosthesis that has an implant facing surface and first and second portions connected to the implant facing surface. The first and second portions each have an outer surface that has a geometry corresponding to the cutting surface of the drill bit such that the first and second portions can be received in respective openings in a bone formed by the drill bit.

Abstract: A method of augmenting a bone defect in proximity to an acetabulum, comprising: implanting an acetabular cup implant into a bone; after implanting the acetabular cup implant, driving a drill bit into the bone so as to form a first void having a geometry corresponding to that of the drill bit; and inserting a void filler into the void formed by the drill bit such that a portion of the void filler is in a working relationship with the acetabular cup implant and another portion of the void filler is disposed within the void.

Abstract: An assembly for attachment to a first implant component has a size and shape of a second implant component to be implanted together with the first implant component. The assembly includes a first body including a plug having a projection, and a second body including a recess having an internal surface defining at least one indentation. In a temporary configuration, when the plug is disposed within the recess and the projection is disposed at least partially within one of the at least one indentations, the first and second bodies are removably connected such that the first and second bodies are prevented from separating. A method of assembling the assembly includes removably connecting the plug of the first body into the recess of the second body by locating the projection within an indentation, such that the bodies are prevented from separating, and positioning the assembly on the first implant component.

Abstract: A method of augmenting a bone defect in proximity to an acetabulum, comprising: implanting an acetabular cup implant into a bone; after implanting the acetabular cup implant, driving a drill bit into the bone so as to form a first void having a geometry corresponding to that of the drill bit; and inserting a void filler into the void formed by the drill bit such that a portion of the void filler is in a working relationship with the acetabular cup implant and another portion of the void filler is disposed within the void.

Abstract: An assembly for attachment to a first implant component has a size and shape of a second implant component to be implanted together with the first implant component. The assembly includes a first body including a plug having a projection, and a second body including a recess having an internal surface defining at least one indentation. In a temporary configuration, when the plug is disposed within the recess and the projection is disposed at least partially within one of the at least one indentations, the first and second bodies are removably connected such that the first and second bodies are prevented from separating. A method of assembling the assembly includes removably connecting the plug of the first body into the recess of the second body by locating the projection within an indentation, such that the bodies are prevented from separating, and positioning the assembly on the first implant component.

Abstract: Tools and methods for implanting hip resurfacing femoral prostheses along a path defined by the axis of a shaped femoral head surface are described. The prostheses are stemless partial ball components having an outer surface shaped to conform to an acetabular socket and may be a two part design having a mating sleeve component with an internal bore adapted to receive the shaped femoral head. The tools and methods are capable of accurately implanting both one and two piece ball components and sleeves without requiring the prosthesis to have a central stem or the preparation of a stem cavity in the femoral head and neck.

Abstract: An acetabular shell or cup removal instrument is disclosed. The instrument includes a first end capable of being received within an acetabular cup and a cutting element pivotally attached. Cutting motion is provided to the instrument by a powered handpiece, so that the cutting element is capable of cutting a bone surface adjacent to an outer surface of the acetabular cup when the first end is within the acetabular cup.

Abstract: Tools and methods for implanting hip resurfacing femoral prostheses along a path defined by the axis of a shaped femoral head surface are described. The prostheses are stemless partial ball components having an outer surface shaped to conform to an acetabular socket and may be a two part design having a mating sleeve component with an internal bore adapted to receive the shaped femoral head. The tools and methods are capable of accurately implanting both one and two piece ball components and sleeves without requiring the prosthesis to have a central stem or the preparation of a stem cavity in the femoral head and neck.

Abstract: A surgical cutting tool for cutting a seating surface of curved contour configuration in natural bone for receiving a component of a prosthetic implant at an implant site. The tool has cutting blades in a cutting blade construct placed within an arbor such that the cutting blades are supported by the arbor circumferentially spaced from one another, with cutting edges of the cutting blades exposed for cutting the seating surface. Stabilizers along the arbor stabilize the tool during a cutting operation, while channels in the arbor along the cutting blades carry away cut bone.

Abstract: A helical reamer for reaming a bone cavity has a longitudinally extending support shaft having a first driven end and a second end having a tip for insertion into the bone cavity. The research for a multiplicity of stamped flat reamer plates each having a plurality of cutting flutes formed on an external surface thereof and a central internal opening to receive the support shaft. The internal opening includes a coupling element in the form of a key and keyway rotationally coupling each reamer plate to the support shaft. The key and keyway allowing each reamer plate to be slightly rotated with respect to the flutes of an adjacent reamer plate. The coupling elements for rotationally coupling the plates to the drive shaft can be mating flattened areas on the internal surface of the stamping and the external surface of the drive shaft. A broach of stamped plates is also shown.

Abstract: An acetabular shell or cup removal instrument is disclosed. The instrument includes a first end capable of being received within an acetabular cup and a cutting element pivotally attached. Cutting motion is provided to the instrument by a powered handpiece, so that the cutting element is capable of cutting a bone surface adjacent to an outer surface of the acetabular cup when the first end is within the acetabular cup.

Abstract: An acetabular shell or cup removal instrument is disclosed. The instrument includes a first end capable of being received within an acetabular cup and a cutting element pivotally attached. Cutting motion is provided to the instrument by a powered handpiece, so that the cutting element is capable of cutting a bone surface adjacent to an outer surface of the acetabular cup when the first end is within the acetabular cup.

Abstract: A toy gun is operated by water under pressure, supplied from a conveniently available source of water under pressure, such as a garden hose connected to a municipal water supply, a household water supply, or a similar source of water under pressure, to launch a projectile, such as a water-filled balloon, along, and preferably through, the barrel of the gun. The projectile is coupled with a firing chamber, preferably by being placed in the firing chamber, adjacent the barrel, and water under pressure is admitted to an actuator for actuating an air compressor which, in turn, creates compressed air that is accumulated in an air chamber and then selectively released to the firing chamber to launch the projectile from the barrel.

Abstract: A hip resurfacing femoral prosthesis has a partial ball component having an outer surface shaped to conform to an acetabular socket and has a mating sleeve component with an internal bore adapted to receive a femoral head. The head has been shaped and dimensioned to engage the bore and is retained by bone ingrowth, an interference fit or by bone cement. The ball component and sleeve axes may be offset to reposition the outer surface.

Abstract: A reamer assembly includes a tool driver and a tool. Tool driver comprises a shaft. The tool receiving end of the shaft has a flange. Formed in the flange are four L-shaped bayonet catches which receive the tool. The tool has a body having slots. A cutter can slidably fit in the slots. When installed in the slots, the cutters project slightly above the body. The projecting portions of the cutters form the cutting edges for shaving or cutting tissue. The reamer is formed by attaching a tool to the tool driver by lowering it in the L-shaped bayonet catches. The reamer can be coupled to a drive means such as a hand drill and inserted in a body cavity. Operating the reamer against body tissue results in shaving of body tissue.

Abstract: An apparatus for preparing the femur of a patient to receive a prosthesis is disclosed. A support is mountable in the recess and is shaped for mounting the first insert on the support. The insert is shaped for guiding pivoting of a post in a direction for reaming the recess.

Abstract: Tools and methods for implanting hip resurfacing femoral prostheses along a path defined by the axis of a shaped femoral head surface are described. The prostheses are stemless partial ball components having an outer surface shaped to conform to an acetabular socket and may be a two part design having a mating sleeve component with an internal bore adapted to receive the shaped femoral head. The tools and methods are capable of accurately implanting both one and two piece ball components and sleeves without requiring the prosthesis to have a central stem or the preparation of a stem cavity in the femoral head and neck.

Abstract: A modular prosthetic acetabular cup for use in restorative hip replacement has an augment which can be attached to an acetabular cup outer shell to provide an acetabular cup with a cross section of a desired configuration. The augment can be attached to the acetabular cup by a coupling element having an outer dovetail portion which slidably engages a groove formed within the augment preferably open to at least a first end thereof. The inner end of the coupling element can engage screw holes of the acetabular cup. The groove of the augment further includes a second end having a gradually increasing distance from the outer surface of the shell and the inner surface of the augment on moving towards the second end of the augment.

Abstract: A hip resurfacing femoral prosthesis has a partial ball component having an outer surface shaped to conform to an acetabular socket and has a mating sleeve component with an internal bore adapted to receive a femoral head. The head has been shaped and dimensioned to engage the bore and is retained by bone ingrowth, an interference fit or by bone cement. The ball component and sleeve axes may be offset to reposition the outer surface.

Abstract: A surgical offset guide tool for making a subsequent preparation on an outer surface of a natural femoral head following a first oversize preparation is disclosed. The guide tool guides a rotary cutter about an offset axis of revolution, the axis being offset from a datum having an axis coaxial with an initial axis of revolution used to create the first oversize preparation of the femoral head. Methods of using the offset guide tool and kits including the offset guide tool are disclosed.