Abstract: A method of and instrumentation for implanting a spherical prosthesis in a joint between a first bone and a second bone. The method includes the steps of exposing a joint between a first bone and a second bone; forming a semispherical cavity in the proximal surface of the first bone; forming a semispherical cavity in the distal surface of the second bone; and inserting a spherical prosthesis into the semispherical cavities in the proximal surface of the first bone and in the distal surface of the second bone.

Abstract: An orthopaedic assembly includes a first portion or an acetabular cup and a second connecting portion or a cup inserter. The acetabular cup includes a cavity for receiving a femoral head and a pole defining a longitudinal axis through the cavity. The acetabular cup further includes an annular face which bounds the cavity and has a plurality of notches extending therein. Each notch includes an undercut wall. The annular face further includes a projection receiving device. A cup inserter includes a body with an end face and a plurality of fingers extending from the end face. Each finger is insertable into a corresponding one of the notches in a direction parallel to the longitudinal axis and is rotatable around the longitudinal axis to a locking position. Each finger includes a transverse surface which matingly engages with a corresponding one of the undercut walls when the finger is in the locking position. The cup inserter further includes a projection and a biasing device.

Abstract: An acetabular reamer includes a base, a first set of semi-circular blades attached to the base, and a second set of semi-circular blades also contacting the base, and crossing and intersecting with the first set of blades at right angles thereto. The base preferably includes a circular plate having a hexagonal drive hole in the center thereof and a plurality of slots in the periphery thereof for anchoring the blades. Each semi-circular blade includes a first end having a projection thereon, a second end opposite from said first end and also having a projection thereon, a first edge having serrated cutting teeth thereon, a second edge opposite from said first edge, and a first and second side surface. The cutting edge of the first set of blades includes a plurality of outwardly facing slots which mate with and engage a second set of inwardly facing slots in the second edge of said second blades.

Abstract: An impact tool useful for performing a number of different surgical and industrial functions is provided. The invented tool can perform such surgical functions as freeing cement, implanting pins, and setting guides and industrial functions such as installing various fasteners. The tool comprises a body having a quick disconnect assembly coupled to a second end for quickly attaching and detaching different desired surgical and industrial implements to the tool. The quick disconnect assembly communicates with an impact inducing assembly is retained in a channel in the body. The impact inducing assembly causes an implement retained in the quick disconnect assembly to deliver an impact with a calibrated force to a desired object. The orientation of the components of the impact inducing assembly can be inverted so that the tool is actuated to apply an instantaneous extraction force to the desired fastener or surgical aid.

Abstract: A tool driver comprising a shaft having a longitudinal axis and opposite ends. A tool base is secured to the shaft at one of the ends. A plurality of tool engaging arms extend generally radially outwardly of the tool base and the shaft. The arms are moveable radially outwardly of the shaft between a tool engaging position and a retracted position. An arm actuator is positioned on the shaft to retract and extend the arms. The other end of the shaft is shaped so as to be engageable with the chuck or collet of a tool driver.

Abstract: An adaptor is provided to convert a bipolar shell trial to and from a unipolar head trial adaptor. A preferred embodiment provides a spring-loaded, snap-in adaptor and a neck length adjusting mechanism for a trial system.

Abstract: An acetabular reamer includes a base, a first set of semi-circular blades attached to the base, and a second set of semi-circular blades also contacting said base, and crossing and intersecting with said first set of blades at right angles thereto. The base preferably comprises a circular plate having a hexagonal drive hole in the center thereof and a plurality of slots in the periphery thereof for anchoring the blades. Each semi-circular blade includes a first end having a projection thereon, a second end opposite from said first end and also having a projection thereon, a first edge having serrated cutting teeth thereon, a second edge opposite from said first edge, and a first and second side surface. The cutting edge of the first set of blades includes a plurality of outwardly facing slots which mate with and engage a second set of inwardly facing slots in the second edge of said second blades.

Abstract: A method for making an acetabular reamer for an acetabular reamer comprising the steps of: fabricating a bowl shaped cup-blank having outer and inner bowl shaped surfaces, perforating a plurality of holes through the cup-blank, the holes each are surrounded by a curved margin, deforming outwardly of the outer surface a cutting portion of the margin of each of the holes, thereby forming cutting edges, the cutting portions are curved outwardly of the outer surface, the cutting edges are curved tangentially of the outer surface and disposed to cut upon rotation of the acetabular reamer.

Abstract: An acetabular bone graft impactor comprising a contact surface at least part of which is located on a head connected to a shaft provided with and anvil to be hit with a hammer. A flange extends from the head so that the contact surface shape can be selectively altered.

Abstract: An acetabular reamer is provided with a shaft having opposed front and rear ends. A mounting cap is securely connected to the front end of the shaft and includes a skirt having an interior surface spaced radially outwardly from the shaft and an opposed non-cylindrical exterior surface. At least one aperture extends through the skirt. A locking spring is disposed adjacent the interior surface of the skirt and includes a locking detent extending through the aperture in the skirt. The spring can be deflected radially inwardly to bring the detent into alignment with the exterior surface of the skirt. A reamer head is mountable over the mounting cap such that the rear wall of the reamer head deflects the spring radially inwardly during mounting and unmounting. In the fully mounted condition of the reamer head, the locking detent of the spring engages an inwardly facing surface of the rear wall of the reamer head. The.degree.

Abstract: A reamer for shaping a socket, such as a hip socket, comprising a cutting head located at one end of a rotatably driven shaft and having a hemispherical portion with a hemispherical exterior surface. The hemispherical portion containing an open substantially hollow chamber and helical openings such as slots, in said hemispherical portion connecting between the exterior surface and the chamber. The trailing portion of each of the openings having a cutting or trailing edge raised slightly above the leading edge of the opening or slot to move material from the socket into the chamber during rotation of the cutting head. The cutting edges having serrations thereon. At least two cutting edges extending across the polar region of the cutting head. A stem extending from the interior center point of the substantially hollow chamber and extending along the polar axis of the hemispherical reamer for connecting and disconnecting the cutting head to a rotatable source.

Abstract: An oblong acetabular cup which includes a cavity for receiving a bearing element is provided. The plane of the opening into the cavity is skewed relative to the prosthesis' longitudinal plane so as to achieve adduction correction, anteversion correction, or both adduction and anteversion correction. In certain preferred embodiments, the prosthesis is constructed from two components which can be oriented with respect to one another to achieve different directions and amounts of anteversion correction. In some embodiments, the two components form a cusp in the outside surface of the prosthesis. Surgical instruments and surgical methods for implanting the prostheses are disclosed.

Abstract: A tool driver which has a body having a bore. The bore has a longitudinal axis. A plunger is disposed in the bore. The body and the plunger have a lock. An actuator is disposed on the body. The actuator and the plunger are loosely coupled. The actuator is axially movable relative to the body and the plunger between a locked position and a retracted position. The actuator, in the locked position, substantially immobilizes the plunger relative to the body. The actuator and the plunger are axially movable together, relative to the body, between the retracted position and an extended position.

Abstract: A reamer for shaping a socket, such as a hip socket, comprising a cutter head located at one end of a rotatably driven shaft and having a hemispherical portion with a hemispherical exterior surface, the hemispherical portion containing a closed hollow chamber, and helical openings, such as slots, in said hemispherical portion connecting between the exterior surface and the chamber, the trailing portion of each of the openings having a cutting edge raised slightly above the hemispherical surface to move material from the socket into the chamber during rotation of the cutter head, and an attachment element for connecting and disconnecting the cutter head and the drive shaft.

Abstract: A tool driver comprising a shaft, a shank, a flange, a clamp and a retainer. The shaft has a longitudinal axis and opposed ends. The shank is joined to one end of the shaft. The flange is joined to the other end of the shaft and has an outwardly facing flange surface extending from the shaft transversely of the axis. The clamp has a clamping surface facing the flange surface. The clamp is movable axially relative to the flange to vary the separation of the surfaces. The retainer is operatively connected to the clamp and is movable relative to the clamp between a first position and a second position. The retainer, in the first position, precludes relative movement of the clamp and the flange.

Abstract: An acetabular reamer cup having a cutting bowl having a plurality of singly curved cutting edges. The cutting bowl has a plurality of slots proceeding the cutting edges. The cutting bowl defines an axis of rotation. A bottom is joined to the cutting bowl. The bottom has a tool driver opening concentric with the axis of rotation.

Abstract: An installation tool has a head for engaging an acetabular cup, and an elongated member mounting the head adjacent an end that projects from the head and is insertable into an opening through the cup. The member end is expandable for engaging the cup at the opening to prevent movement of the cup relative to the member end and hold the cup in engagement with the head in order to move the cup with movement of the member end to place the cup for implanting at a desired position. The member end also is contractable for releasing the cup after implanting at the desired position. The elongated member is composed of a tubular shaft having a passage therethrough and a rod slidably disposed through the shaft passage. The member end is composed of a split collet with expandable and contractable jaws on one end of the shaft and an outwardly flared cam element formed on one end of the rod and extending between the collet jaws.

Abstract: A hand-held surgical rotary impact tool and instrument extension for removing artificial hip, or acetabular, cups of a hip joint by rotating the cup a predetermined number of degrees. This rotational limitation is provided by a pin and arcuate groove connection between a fixed housing and rotatable shaft. While instrument extensions are sized to allow for different acetabular, or hip, cups, the cup engaging end can have radially adjustable pins for permitting a variable diameter for connection to a cup.

Abstract: A disposable acetabular reamer cup which has a cutting bowl haing a plurality of cutting edges. The cutting bowl has perforations adjoining the cutting edges. The cutting bowl defines an axis of rotation. The cutting bowl has a bottom opening. A polymeric plug is joined to the cutting bowl. The plug is concentric with the axis of rotation. The plug occupies the bottom opening. The plug has a tool driver opening concentric with the axis of rotation.