Abstract: A femoral instrument for use in the intramedullary canal is described and includes an intramedullary rod having a tip at a free end. A body is attached to the intramedullary rod and has a face with a bone abutting portion. A centralizer mechanism is located within the rod and is operable to deploy and retract a plurality of members to engage and disengage an inner surface of the intramedullary canal. The length of the intramedullary rod from the tip to the face of the body is less than 30 cm. The instrument can also include an angular adjustment mechanism. The angular adjustment mechanism can have a plurality of formations and can be rotated about the longitudinal axis of the intramedullary rod to present at least a one of the formations to abut a portion of the body to define the relative angle between the body and the intramedullary rod.

Abstract: A femoral sizing instrument for use in a knee joint replacement procedure has a housing which includes formations by which it can be located relative to the femoral posterior condyles. A cortex arm has a tip for engaging the anterior cortex of the femur and a sulcus arm has a tip for engaging the sulcus. Each of the cortex and sulcus arms can be adjusted relative to the housing to adjust the distance between its tip and the posterior condyles measured generally parallel to the anterior posterior axis. The instrument includes at least one scale for indicating the positions of the tips of the cortex and sulcus arms relative to the posterior condyles.

Abstract: An orthopaedic surgical instrument and method includes securing an anchor to a tibial prosthetic component implanted in a proximal end of a patient's tibia, moving a separator posteriorly toward the anchor to position a tip of the separator between a lower side of the tibial tray and an upper end of the tibial sleeve, advancing the separator from anterior to posterior between the lower side of the tibial tray and the upper end of the tibial sleeve to detach the tibial tray from the tibial sleeve, and removing the tibial tray from the proximal end of the patient's tibia. The tibial prosthetic component includes a tibial tray and a tibial sleeve secured to the tibial tray.

Abstract: A patella drill guide includes a base portion rotatably mounted on a bone-gripping component. A trial portion with a contoured articulation surface is above the base portion. The base portion and trial portion have aligned drill guide bores. The base portion and trial portion can be rotated together on the bone-gripping component to optimize the positions of the drill guide bores with respect to the patella surface, thereby optimizing the locations of the mounting pegs of the patella implant component on the patella to optimize the orientation of the patella implant component. The base and the bone-gripping component may be unitary so that the entire assembly rotates on the patella about the central longitudinal axis of the bone-gripping component.

Abstract: A number of orthopaedic surgical instruments for use in a surgical procedure to prepare a patient's femur to receive an orthopedic prosthesis are disclosed. The tools include guide tools, cutting tools, surgical blocks, and other orthopaedic surgical instruments configured to plan and guide the preparation of the patient's femur. A method of using the orthopaedic surgical instruments is also disclosed.

Abstract: A joint prosthesis system is suitable for cemented fixation. The system has two metal implant components and a bearing. One of the metal implant components has an articulation surface for articulation with the bearing. The other metal implant component has a mounting surface for supporting the bearing. One of the metal implant components includes an extension, such as a stem or pegs, with an exposed outer surface. The metal implant component from which the extension extends comprises titanium and the exposed outer surface of the extension comprises a different form of titanium. A method of making the joint prosthesis is also disclosed.

Abstract: A surgical instrument, for example a cutting block for use in knee surgery, comprises a mounting surface defining at least one opening for receiving a mounting projection. The mounting surface further defines a blind recess which extends linearly from the at least one opening. The blind recess may extend to an edge of the mounting surface. A system including a surgical instrument and one or more mounting projections is also disclosed. The blind recess can be used as a track to guide a projection to an opening, increasing the area of the instrument that can be used to locate the projection in the correct position. The recess acts as a guide for the projection to enter the opening by providing tactile feedback to guide the projection towards the opening. If the recess also extends to the edge of the instrument, the recess may be visible more easily when the surgeon is installing the instrument providing visual as well as tactile feedback.

Abstract: A prosthetic total knee replacement system comprises a distal femoral implant component, a tibial tray implant component and a mobile bearing tibial tray insert. The mobile bearing tibial tray insert is rotatably mountable on the tibial tray for articulation with the distal femoral implant component. The mobile bearing tibial tray insert rotates with respect to the tibial tray around a substantially vertical first rotational axis offset laterally from the medial-lateral centerline of the mobile bearing tibial tray insert and the distal femoral implant component rotates with respect to the tibial tray insert about a substantially vertical second rotational axis offset medially from the first rotational axis.

Abstract: Surgical instruments for use in implanting a stem component into a knee of a patient include a canal reamer and an associated implant reference guide.

Abstract: An orthopaedic prosthesis for cementless fixation has a solid metal base and porous metal pegs extending out from the base. The pegs are mechanically, rather than metallurgically, fixed to the base. A process for making such a prosthesis is also disclosed.

Abstract: A number of orthopaedic surgical instruments for use in a surgical procedure to prepare a patient's femur to receive an orthopedic prosthesis. The tools include guide tools, cutting tools, surgical blocks, and other orthopaedic surgical instruments configured to plan and guide the preparation of the patient's femur. A method of using the orthopaedic surgical instruments is also disclosed.

Abstract: An orthopaedic surgical instrument assembly is disclosed. The assembly includes an orthopaedic surgical instrument including a first surface, and a measurement gauge removably coupled to the orthopaedic surgical instrument. The gauge includes an arm having a tip positioned proximal to the orthopaedic surgical instrument, and a plurality of markings defined on the arm. Each marking indicates a predetermined distance from the first surface of the orthopaedic surgical instrument. The assembly may be used during an orthopaedic surgical procedure on a femur, which is also described herein.

Abstract: An orthopaedic knee prosthesis includes a femoral component having a condyle surface. The condyle surface is defined by one or more radii of curvatures, which are controlled to reduce or delay the onset of anterior translation of the femoral component relative to a tibial bearing.

Abstract: A femoral sizing guide comprises a body, a superstructure and a stylus. The body has feet extending underneath and resting against posterior condylar surfaces of the femur and an extension component. The superstructure is slidable on the extension component and the extension component is rotatable with respect to the feet. The stylus may be coupled to the superstructure. The superstructure has a first guide hole defining a first alignment axis and the extension component has a second guide hole defining a second alignment axis. The distance between the first and second guide holes varies as the superstructure slides relative to the body. A method of locating an alignment axis on a resected femoral surface at a distal end of a femur which is transverse to the longitudinal axis of the femur using the femoral sizing guide is also disclosed.

Abstract: Methods of surgically preparing a patient's tibia are disclosed. Some methods include positioning a guide tower on a surgically-prepared proximal surface above an opening of a medullary canal of the patient's tibia, attaching a stem trial to a lower end of an offset tool that is sized to be received in the guide tower, and advancing the stem trial through the guide tower and the surgically-prepared proximal surface into the medullary canal. The method may include moving the guide tower to a desired offset orientation on the surgically-prepared proximal surface and advancing a reamer through the guide tower into the medullary canal. The method may also include positioning a tibial base trial on the surgically-prepared proximal surface based on the desired offset orientation.

Abstract: A posterior stabilized knee orthopaedic prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The tibial bearing includes a spine having a concave cam surface and a convex cam surface. The femoral component includes a posterior cam having a concave cam surface and a convex cam surface. During flexion, the concave cam surface of the posterior cam contacts the convex cam surface of the spine and the convex cam surface of the posterior cam contacts the concave cam surface of the spine.

Abstract: A fixed-bearing prosthesis includes a femoral component having a medial condyle surface and a lateral condyle surface. The knee prosthesis also includes a bearing having a medial bearing surface configured to articulate with the medial condyle surface of the femoral component, and a lateral bearing surface configured to articulate with the lateral condyle surface of the femoral component. A tibial tray is secured to the bearing. The tibial tray has a platform with an elongated stem extending downwardly from a lower surface thereof. A posterior buttress extends along a posterior section of the perimeter of the tray's platform, and an anterior buttress extends along an anterior section of the perimeter of the tray's platform. Differently-sized tibial trays are interchangeable with differently-sized bearings.

Abstract: A reusable orthopaedic instrument includes a reusable orthopedic trial having a first outer surface and a second outer surface that is opposite the first outer surface. The second outer surface includes a plurality of sidewalls extending outwardly therefrom to form a cavity. A drain hole is formed in the second outer surface at a location within the cavity. The drain hole extends through the reusable orthopaedic trial from the second outer surface to the first outer surface. Further, the second outer surface slopes downwardly from the plurality of sidewalls toward the drain hole.