Abstract: A reaction-bonded silicon carbide (SiC) body is produced by: providing a preform including ceramic elements and carbon, and one or more surface features; providing a powder which includes diamond particles and carbon; locating the powder in the surface feature(s); and infiltrating the preform and the powder with molten silicon (Si) to form reaction-bonded SiC in the preform, and to form reaction-bonded SiC coatings on the diamond particles. The present disclosure also relates to a device/component which includes: a main body portion and discrete elements located at least partially within the main body portion. The main body portion may include reaction-bonded SiC and Si, but not diamond, while the discrete elements include diamond particles, reaction-bonded SiC coatings surrounding the diamond particles, and Si. According to the present disclosure, diamond may be advantageously located only where it is needed.

Abstract: A meniscus replacement device for replacing damaged soft tissue at a host knee includes a first component comprising a first tissue-interface surface shaped to free-floatingly interface with tissue structure of one of a femur and a tibia in a knee joint having a damaged soft tissue, and comprises a second component comprising a second tissue-interface surface shaped to free-floatingly interface with a second tissue structure of the other of the femur and the tibia in the knee joint. The second component may include a containment cavity receiving at least a portion of the first component. In another form, the free floating soft joint tissue replacement component and the base component are fixed together. In some aspects, the second tissue-interface surface is shaped to fit contours of a natural tibia plateau. In some aspects, the first tissue-interface surface is shaped to fit contours of a femoral surface.

Abstract: An orthopaedic system includes an insert defining an anterior-posterior centerline and including: a medial half on one side of the centerline and defining a medial shape, the medial half having a medial articular surface defining a medial dwell region; and a lateral half on an opposite side of the centerline and defining a lateral shape that differs from the medial shape, the lateral half having a lateral articular surface. A femoral component includes a medial condylar portion bearing on the medial articular surface and a lateral condylar portion bearing on the lateral articular surface. The insert is configured to substantially limit medial anterior-posterior translation on the femoral component and define a pivot axis that extends through the medial dwell region. The insert is configured such that rotation of the lateral articular surface follows an arcuate path about the pivot axis.

Abstract: A powder boronizing composition comprising: a. 0.5 to 4.5 wt % of a boron source selected from B4C, amorphous boron, calcium hexaboride, borax or mixtures thereof; b. 45.5 to 88.5 wt % of a diluent selected from SiC, alumina or mixtures thereof; c. 1.0 to 20.0 wt % of an activator selected from KBF4, ammonia chloride, cryolite or mixtures thereof; and d. 10.0 to 30.0 wt % of a sintering reduction agent selected from carbon black, graphite or mixtures thereof.

Abstract: An implant assembly comprising an implant having a load bearing surface with a contour corresponding to a patient's articular surface, and a bone facing surface including a fixation element, an anchor configured to be secured to bone beneath said patient's articular surface, said anchor including a second fixation element, and wherein said first fixation element is configured to be secured to said second fixation element.

Abstract: A fixation device for a knee replacement. The fixation device includes a stem configured to be fixedly attached to one of a tibial component of the knee replacement and a femoral component of the knee replacement. The stem has a continuously tapered outer surface and has a distal end that is distal to said one of the tibial component and the femoral component. A tapered projection is positioned on the continuously tapered outer surface and is tapered in the same direction as the continuously tapered outer surface. The stem and the tapered projection are configured so that the continuously tapered outer surface and the tapered projection engage a patient's bone when the stem is inserted into a bone canal within the patient's bone. In addition, the continuously tapered outer surface of the stem at the distal end of the stem and the tapered projection are configured to mechanically fix the knee replacement to the patient's bone by being wedged within the bone canal.

Abstract: The present invention relates to an asymmetric artificial knee joint that includes a bearing member having a medial sulcus and a lateral sulcus, and a femoral component having a medial condyle and a lateral condyle and disposed on the bearing member.

Abstract: A prosthetic knee implant system includes a prosthetic femoral component and a prosthetic tibial component. The femoral component includes a lateral condyle, a medial condyle, a bone-contacting surface that may be formed of porous metal, and an articular surface that may be formed of PAEK/PEEK. The tibial component includes medial and lateral condylar portions, a bone-contacting surface that may be formed of porous metal, and a second surface opposite the bone-contacting surface. Recesses extend a depth into the second surfaces of the medial and lateral condylar portions. Medial and lateral bearing inserts with flat proximal faces are positioned with the recesses of the medial and lateral condylar portions. Flexible medial and lateral meniscal components are positioned to surround the medial and lateral inserts, respectively, and extend proximal to the second surface of the insert.

Abstract: An orthopaedic surgical instrument system that includes an orthopaedic surgical instrument adapted to be positioned on a proximal end of a patient's tibia, and a tibial bearing trial assembly, and a tibial evaluation component, and a tibial base trial component configured to be coupled to the orthopaedic surgical instrument. A tibial evaluation component includes a base plate and a generally Y-shaped posterior buttress extending upwardly from a superior surface of the base plate, such that the posterior buttress of the insert component is configured to be received in the opening of the tibial bearing trial assembly to prevent rotation of the tibial bearing trial component relative to the tibial base trial component.

Abstract: A translation system and related methods are described. The translation system comprises a translation server computer and a user computer, such as a mobile device. The translation server computer is programmed to allow the user computer to dynamically update translations for electronic resources displayed by a computer program, such as a mobile app, without having to download new versions of the computer program. The user computer is configured to accept suggested translations for specific electronic resources, submit them to the translation server computer for approval, and subsequently display approved translations for the specific electronic resources.

Abstract: An implant providing for both short and long term stability and fixation is disclosed. The implant includes a plurality of projections extending from a bone contacting surface, and a porous material covering at least portions of the surface and projections. The orientation of the projections and the porous material provide for the stability and fixation. Methods of forming and utilizing the implant are also disclosed.

Abstract: An artificial knee joint includes a femoral component (1) and a tibial component (2). The femoral component (1) includes an intercondylar box (11). A cam (12) is provided on posterior of the intercondylar box (11). The tibial component (2) includes a medial condyle bearing surface (21) and a lateral condyle bearing surface (22) arranged on right and left side respectively. A post (23) is provided between the medial condyle bearing surface (21) and the lateral condyle bearing surface (22). The post (23) is adapted to the intercondylar box (11). The post (23) has a first arc surface (231) on the lateral side of posterior surface. The post (23) has a second arc surface (232) on the posterior surface and on the medial side of the first arc surface (231). A third arc surface (121) and a forth surface (122), cooperating with the first arc surface (231) and the second arc surface (232), are provided on the cam (12) accordingly.

Abstract: The invention relates to a base that includes a unit for osseous attachment onto a tibia, and a plate having posterior, anterior, medial and lateral edges; a posterior pin and an anterior pin having a posterior flat section and an anterior flat section; two posterior lugs protruding above the plate and arranged on the posterior edge of each side of the posterior pin; and two anterior lugs arranged on each side of the anterior pin. The posterior flat section and the anterior flat section are arranged so as to simultaneously engage with the insert. Each posterior tab includes a support extension for inserting, in an anteroposterior direction, a complementary support tab of the insert. Each anterior lug includes a unit for snap-coupling the insert onto the base.

Abstract: An implant providing for both short and long term stability and fixation is disclosed. The implant includes a plurality of projections extending from a bone contacting surface, and a porous material covering at least portions of the surface and projections. The orientation of the projections and the porous material provide for the stability and fixation. Methods of forming and utilizing the implant are also disclosed.

Abstract: A bicruciate retaining tibial implant baseplate includes a tibial baseplate with medial and lateral condylar portions configured to receive bearing inserts. The baseplate includes an anterior bridge connecting the medial and lateral portions. A posterior wall of the anterior bridge may be angled to provide downward force on a correspondingly angled anterior portion of the tibial eminence when the baseplate is implanted. A method of preparing the tibia for implant includes a punch tower and punch guide configured to both cut the anterior tibial eminence and provide protection to the tibial eminence during resection of the proximal tibia.

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: A femoral prosthesis may be formed as a femoral component incorporating a base material and an articulating material. In one exemplary embodiment, the base material is a metal and the articulating material is a polymer. Specifically, the base material provides strength and rigidity to the femoral component, while the articulating material contacts a tibial prosthesis or natural tibia during joint articulation. In one exemplary embodiment, the articulating material forms the articulating surface of one or more condyle portions of the femoral component.

Abstract: A knee joint endoprosthesis (1) for forming an articulation between a femur and a tibia includes a femur component (2), which is connected to the femur, a tibia component (4), which is connected to the tibia, and an intermediate element (3) which is mounted between the tibia component (4) and the femur component (2). This intermediate element lies against the femur component (2) with a modular sliding surface (9) which includes a lateral sliding surface (9a) and a medial sliding surface (9b), and can be connected in a releasable manner to the tibia component (4). The lateral sliding surface (9a) and the medial sliding surface (9b) of the intermediate element (3) have different sagittal cross-sectional profiles.

Abstract: A post-operative pain inhibitor system comprises a controller and leads. Neuro-stimulator circuitry may be included within the patient controller or within one or more prosthetic components for generating a signal. In one example, a hip implant includes a prosthetic component having at least one electrode where the at least one electrode is configured to deliver energy pulses. Topical leads, percutaneous leads, subcutaneous leads, intraosseous leads, or leads can be placed in proximity to the operative field corresponding to the prosthetic component installation. The lead or electrodes can be coupled to neuro-stimulation circuitry to stimulate peripheral nerve fibers to affect body generated action potentials. A transmitter or power source can be housed in a prosthetic hip component. Controller can modify the pulse width, pulse shape, pulse repetition rate, and pulse amplitude of the signal thereby allowing the patient to adapt the signal to minimize their perceived pain.

Abstract: A knee prosthesis system for total knee replacement procedures includes a plurality of distinctly-sized femoral components, a plurality of distinctly-sized fixed tibial components, a plurality of distinctly-sized mobile tibial components, a plurality of fixed inserts, and a plurality of mobile inserts. Each of the mobile inserts is sized and shaped such that each may be optimally matched to one of the femoral components and may be used with any one of the mobile tibial components. Each of the fixed inserts is sized and shaped such that each may be optimally matched to one of the femoral components and may be used with any one of the fixed tibial components.

Abstract: A tibial implant includes a baseplate having a proximally facing surface surrounded at least in part by a proximally extending wall. The wall has a ramp surface extending from the wall towards the baseplate proximally facing baseplate surface and a bore located distally of the ramp. A polyethylene bearing insert is mounted on the baseplate and has a distally facing surface engaging the proximally facing surface of the baseplate. The distally facing bearing insert surface has a recess and the insert has a side surface with a passageway extending from the recess through the insert side surface. A spring detent is mounted in the bearing insert recess and has a moveable pin biased outwardly of the bearing insert side surface and into the bore of the baseplate.

Abstract: Methods and devices are provided for knee joint replacement with anterior cruciate ligament (ACL) substitution. Generally, the methods and devices can allow a knee joint to be partially or totally replaced in conjunction with substitution of the knee joint's ACL. In one embodiment, a knee replacement prosthesis can include a medial or lateral femoral implant, a femoral intercondylar notch structure, a medial or lateral tibial insert, and an ACL-substitution member. The ACL-substitution member can be configured to engage with the femoral intercondylar notch structure during a full range of knee motion and/or during only early knee flexion.

Abstract: A method of trialing prosthetic components of a knee prosthesis including positioning a femoral trial component on a surgically-prepared distal end of a patient's femur, assembling a tibial bearing trial component, and positioning the tibial bearing trial component on a tibial base trial component seated on a surgically-prepared proximal end of a patient's tibia. The method may also include adjusting the patient's leg with the tibial bearing trial component engaging the femoral trial component, and readjusting the patient's leg with the tibial bearing trial component engaging the femoral trial component after positioning the tibial bearing trial component on the tibial base trial component and a keel punch.

Abstract: An orthopaedic surgical instrument system that includes an orthopaedic surgical instrument adapted to be positioned on a proximal end of a patient's tibia, and a tibial bearing trial assembly configured to be coupled to the orthopaedic surgical instrument. The tibial bearing trial assembly includes a plurality of tibial bearing surface trial components and at least one shim.

Abstract: A low friction resurfacing implant system including a first implant component having a first bearing surface and a first engagement surface. The first engagement surface is located opposite the first bearing surface. The first implant component has a leading edge and a trailing edge. The first implant component includes teeth that extend from the first engagement surface. The teeth are arranged in a plurality of rows. The teeth in adjacent rows are offset from each other.

Abstract: This invention relates to an artificial knee joint component capable of adjusting alignment or balancing (extension gap and flexion gap) between the tibia and the femur.

Abstract: A prosthesis for replacing a knee joint between a femur and a tibia can include a femoral component, a tibial component, a bearing and a yoke assembly. The yoke assembly can have a yoke disposed between the bearing and the femoral component and an axle having an axle axis. The axle can hingedly couple the yoke with the femoral component. Rotation of the femoral component about a rotation axis that is perpendicular to the axle axis causes concurrent rotation of the yoke about the rotation axis.

Abstract: The invention relates to an articulating joint spacer for temporary replacement of a joint, whereby the joint spacer comprises two spacer parts which each comprise one sliding surface on which the spacer parts, in the patient-inserted state, touch against each other in mobile manner and roll off on each other, and the remaining spacer parts are made, at least in part, of a second bone cement that contains at least one water-soluble antibiotic. The invention also relates to a method for producing a two-part articulating joint spacer, in which a sliding surface is formed in both spacer parts from a low-abrasion first bone cement and at least the surfaces of the remaining spacer parts, at least 50% thereof, are formed with a second bone cement that contains at least one water-soluble antibiotic.

Abstract: A shock absorbent system for a joint prosthesis includes a shock absorbent material. The shock absorbent system may be used in both hip and knee joint prostheses. In one example, a knee joint prosthesis includes a tibial plate, a femoral component having a moveable condyle in contact with a shock absorbent material, wherein movement of the moveable condyle deforms the shock absorbent material, and a tray insert disposed between the tibial plate and the moveable condyle.

Abstract: A knee joint prosthesis assembly according to the present disclosure can include a femoral component, a unitary tibial component, a medial bearing, and a lateral bearing. The femoral component can have a medial and a lateral condyle portion connected by a patellar track portion. The femoral component can form an opening between the medial and lateral condyles. The unitary tibial component can have a medial portion that includes a first posterior engagement lip and a first outer securing lip. The tibial component can further include a lateral portion that includes a second posterior engagement lip and a second outer securing lip. The medial bearing can have a first posterior groove formed thereon that selectively engages the first posterior engagement lip and a first outer groove that selectively engages the first outer securing lip.

Abstract: An orthopaedic knee prosthesis includes a tibial bearing component with surface features which operate to protect adjacent soft tissues of the natural knee throughout a wide range of flexion. More particularly, the tibial bearing component provides an anterior relief space disposed between the dished lateral and medial articular compartments, in which the relief space is convex as viewed from a sagittal perspective across the medial/lateral extent of the relief space.

Abstract: According to one aspect of the present invention, there is provided a tibial component (10), suitable for use in an orthopedic prosthesis, which prosthesis includes a femoral component and a spacer bearing (70), the tibial component comprising a planar tibial plate (15) having an upper bearing surface (30) and a lower attachment surface (20), and the tibial plate further having at least one spacer bearing attachment means for removably securing the spacer bearing to the tibial plate.

Abstract: A tibial prosthesis has a bearing component configured for an anterior-medial insertion, which advantageously avoids the extensor mechanism of the knee. A tibial tray may include a banana-shaped boss that corresponds to a notch formed in the bearing component. After the bearing component is inserted along the anterior-medial path, the boss is received within the notch by rotating the bearing component with respect to the tibial tray. This rotation seat the bearing component upon the tibial tray in the manner of a fixed-bearing prosthesis. Alternatively, the boss and notch may define angled central axes which allow straight anterior-medial insertion of the bearing component and locking engagement to the tibial tray.

Abstract: A reinforced joint assembly includes a first implant portion secured to a sectioned end of a first bone. A second implant portion is likewise secured to a sectioned end of a second bone and in opposing fashion relative to the first implant to define a joint zone therebetween. The first implant exhibits a first surface profile, whereas the second implant exhibits a second and mating surface profile. A male projection extends from the first surface profile of the first implant and seats within a recess defined within the second implant.

Abstract: A medical device for creating an artificial knee joint or an artificial cruciate ligament in a mammal patient, the medical device comprising a transversal member adapted to be placed through at least three layers of cortical bone of the distal portion of the femoral bone, out of totally four cortical layers along a prolongation of the transversal member. The transversal member is adapted to be involved in the artificial knee joint or the artificial cruciate ligament, wherein the transversal member comprises at least one fixation portion adapted to be involved in fixation of the transversal member to at least one of the at least four layers of femoral cortical bone.

Abstract: A new class of total knee replacement includes a posterior cruciate ligament retaining anterior cruciate ligament substituting apparatus and method. Particular design considerations include: 1) a specific extension surface separate from the flexion surface, 2) rotational control in full extension to create the so-called screw-home mechanism, 3) translation restraints that will substitute for ACL function including a CAM-post or other abutment mechanism while allowing normal PCL function which should improve natural proprioception, 4) a modified femoral component with separate radii of curvature for the flexion and extension arcs of at least one condyle, and 5) a tibial component with slope built into the posterior aspect of its bone contacting surface on both sides of the PCL.

Abstract: An orthopedic prosthetic system comprises a base portion and an elongated guide member protruding from a bottom surface of the base portion. The elongated guide member extends from a posterior edge of the base portion toward an anterior edge of the base portion and comprises an overhang element and an undercut face. The prosthetic system further comprises an insert portion configured to slideably engage the base portion and the elongated guide member. The insert portion comprises an underhang element configured to engage at least a portion of an undercut area defined by the overhang element and undercut face of the elongated guide member.

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: An orthopaedic tibial prosthesis includes a tibial baseplate with an asymmetric periphery which promotes proper positioning and orientation on a resected tibia, while also facilitating enhanced kinematics, soft-tissue interaction, and long-term fixation of the complete knee prosthesis. The asymmetric baseplate periphery is sized and shaped to substantially match portions of the periphery of a typical resected proximal tibial surface, such that proper location and orientation is evident by resting the baseplate on the tibia. The baseplate periphery provides strategically positioned relief and/or clearance between the baseplate periphery and bone periphery, such as in the posterior-medial portion to prevent deep-flexion component impingement, and in the anterior-lateral portion to avoid undue interaction between the anatomic iliotibial band and prosthesis components.

Abstract: An orthopaedic tibial prosthesis includes a tibial baseplate with an asymmetric periphery which promotes proper positioning and orientation on a resected tibia, while also facilitating enhanced kinematics, soft-tissue interaction, and long-term fixation of the complete knee prosthesis. The asymmetric baseplate periphery is sized and shaped to substantially match portions of the periphery of a typical resected proximal tibial surface, such that proper location and orientation is evident by resting the baseplate on the tibia. The baseplate periphery provides strategically positioned relief and/or clearance between the baseplate periphery and bone periphery, such as in the posterior-medial portion to prevent deep-flexion component impingement, and in the anterior-lateral portion to avoid undue interaction between the anatomic iliotibial band and prosthesis components.

Abstract: An orthopaedic tibial prosthesis includes a tibial baseplate with an asymmetric periphery which promotes proper positioning and orientation on a resected tibia, while also facilitating enhanced kinematics, soft-tissue interaction, and long-term fixation of the complete knee prosthesis. The asymmetric baseplate periphery is sized and shaped to substantially match portions of the periphery of a typical resected proximal tibial surface, such that proper location and orientation is evident by resting the baseplate on the tibia. The baseplate periphery provides strategically positioned relief and/or clearance between the baseplate periphery and bone periphery, such as in the posterior-medial portion to prevent deep-flexion component impingement, and in the anterior-lateral portion to avoid undue interaction between the anatomic iliotibial band and prosthesis components.

Abstract: An implant having a porous tissue ingrowth structure and a bearing support structure is disclosed. The implant includes a metal insert having a bone ingrowth structure, an intermediate structure and a bearing support structure. A bearing surface is formed from a polymer material and attached to the bearing support structure. The intermediate structure has a porosity sufficient to inhibit the polymer material from translating through the bearing support structure to the bone ingrowth structure.

Abstract: A knee implant includes a first implant part adapted for attachment to a femur and a second implant part adapted for attachment to a tibia. The knee implant includes a hydromagnetic joint having a first magnetic element with a first magnetically charged surface and a first buoyant element coupled with the first magnetic element, and a second magnetically charged surface that opposes the first magnetically charged surface of the first magnetic element and a second buoyant element coupled with the second magnetic element. A fluid body is disposed between the first and second buoyant elements, and the first and second buoyant elements are in fluid communication with one another through the fluid body. The hydromagnetic joint has an enclosure extending between the first and second buoyant elements for containing the fluid body therebetween, whereby the first and second buoyant elements are moveable relative to one another.

Abstract: A hinged knee prosthesis (10) comprises a tibial component (16) and a femoral component (14). The tibial component (16) is configured to attach to a tibia. The tibial component has a bearing surface (128). The femoral component (14) is configured to hingedly attach to the tibial component (16) and rotate relative to the tibial component (16). The femoral component (14) comprises a medial condyle (30) and a lateral condyle (32). The medial and lateral condyles (30 and 32) have an eccentric sagittal curvature surface (50) configured to rotate and translate on the bearing surface (128) of the tibial component (16). A method of rotating a hinged knee (10) through a range of flexion is provided. The method fixedly attaches a femoral component (14) to a tibial component (16). Axial rotation of the femoral component (14) is induced relative to the tibial component (16) when the hinged knee (10) is flexed.

Abstract: One embodiment of the present invention relates to a system in which a knee prosthesis is capable of conversion from a cruciate retaining type prosthesis to a posterior stabilizing type prosthesis. Another embodiment of the present invention relates to a system in which a knee prosthesis is converted from a cruciate retaining type prosthesis to a posterior stabilizing type prosthesis. Another embodiment of the present invention relates to a method in which a knee prosthesis is capable of conversion from a cruciate retaining type prosthesis to a posterior stabilizing type prosthesis. Another embodiment of the present invention relates to a method in which a knee prosthesis is converted from a cruciate retaining type prosthesis to a posterior stabilizing type prosthesis. Another embodiment of the present invention relates to a method of making a knee prosthesis that is capable of conversion from a cruciate retaining type prosthesis to a posterior stabilizing type prosthesis.

Abstract: A prosthetic knee joint assembly includes a femoral component and a bearing that supports articulation of the femoral component. The assembly further includes a tibial tray. Furthermore, the assembly includes a ligament link operably coupled to the tibial tray or the femoral component via a coupling component. The ligament link extending through the other of the tibial tray or the femoral component to couple to the respective one of the femur or tibia. The ligament link extends between first and second ends and includes an outer wall defining an interior longitudinal passage portion. First and second apertures extend through the wall. The first end extends through the first and second apertures and the longitudinal passage portion to define a first adjustable loop, and the second end extends through the first and second apertures and the longitudinal passage portion to define a second adjustable loop.

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 prosthesis system for replacing a knee joint between a femur and a tibia can include a first femoral component including a first condylar portion, a second condylar portion, a first sidewall extending superiorly from the first condylar portion and a second sidewall offset from the first sidewall a first distance and extending superiorly from the second condylar portion. A tibial component can have a bone engaging inferior surface and a bearing engaging superior surface. A bearing can have an inferior surface that engages the bearing engaging surface and a superior femoral engaging surface. The bearing can define an opening and a bearing keyway. A first yoke and a second yoke can each have an inferior portion, a superior portion, and a yoke keyway extending therethrough.

Abstract: A method of implanting a knee replacement system in a leg with a femur and a tibia of a patient can include, implanting a femoral component onto a condyle of the femur and placing a trial tibial component on a tibial plateau of the tibia. The tension of a posterior cruciate ligament can be adjusted. The tension of an anterior cruciate ligament can be adjusted. The posterior position of the trial tibial component can be adjusted. The knee condition at toe off onset can be simulated during walking.

Abstract: A constrained prosthetic knee having a modular hinge post and a rotating bearing. A cannulated hinge post is rotatably connected to the femoral component of the knee prosthesis so that a hinge post extension may be anteriorly positioned through the hinge post and into the tibial component of the knee prosthesis, after positioning of the femoral component in the femur and the tibial component in the tibia. The hinge post is preassembled to the femoral component so that such assembly is not required during the implantation procedure. A meniscal component forming the rotating bearing of the knee prosthesis is packaged together with the hinge post extension so that the appropriate hinge post extension is readily available.