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 degradation controlled metal implant and methods of controlling the degradation of the implant. In one embodiment, the implant includes a body, one or more apertures, and one or more fastener blanks fixed within one or more apertures. In another embodiment, the implant includes a body of a first material and a second material plated in various patterns over the first material.

Abstract: Medical instrumentation is provided, in particular for implanting a hip joint stem, which includes a rasping instrument having a rasp stem defining a longitudinal direction. The rasp stem has at least two depth stops arranged or formed thereon. An implantation set is also provided which includes such a rasping instrument.

Abstract: A medical device for fixation in a femoral bone of a patient is provided, the medical device comprises: a connecting portion adapted to be connected to a prosthetic hip joint contacting portion, an expanding portion, and a bone contacting surface on the expanding portion. The expanding portion could be adapted to be at least partially inserted into the femoral bone of a patient and to expand within the femoral bone, such that the bone contacting surface is placed in contact with the inside of the femoral bone for fixating the medical device to the femoral bone. By the fixation using an expanding portion a sturdy fixation is achieved without the need to go into or penetrate bone, or the need for fixation using bone cement.

Abstract: A bone fixation device is provided with an elongate body having a longitudinal axis and having a first state in which at least a portion of the body is flexible and a second state in which the body is generally rigid, an actuateable gripper disposed at one or more locations on the elongated body, a hub located on a proximal end of the elongated body, and an actuator operably connected to the gripper(s) to deploy the gripper(s) from a retracted configuration to an expanded configuration. Methods of repairing a fracture of a bone are also disclosed. One such method comprises inserting a bone fixation device into an intramedullary space of the bone to place at least a portion of an elongate body of the fixation device in a flexible state on one side of the fracture and at least a portion of a hub on another side of the fracture, and operating an actuator to deploy at least one gripper of the fixation device to engage an inner surface of the intramedullary space to anchor the fixation device to the bone.

Abstract: A bone compacting device for compacting cancellous bone within a bone cavity, the bone compacting device including a body having a plurality of segments, wherein each segment is adjacent to at least one adjacent segment between a first end and a second end of the body, and wherein each of the plurality of segments is independently expandable to contact the cancellous bone.

Abstract: An orthopaedic prosthesis for use in a hip replacement surgery. The orthopaedic prosthesis includes a metallic foam shell and a metallic core. The metallic core includes a neck configured to receive a femoral head component and a stem extending through the metallic foam shell.

Abstract: A segmented bone fixation device is provided with an elongate body having a longitudinal axis and having a first state in which at least a portion of the body is flexible and a second state in which the body is generally rigid. Methods of repairing a fracture of a bone are also disclosed. One such method comprises inserting a segmented fixation device into an intramedullary space of the bone to place at least a portion of the fixation device in a flexible state on one side of the fracture, providing rigidity across the fracture, and operating an actuator to deploy at least one gripper to engage an inner surface of the intramedullary space to anchor the fixation device to the bone. Various configurations allow a segmented device body to change shape as it moves from a flexible state to a rigid state.

Abstract: A femoral prosthesis for use during performance of a hip replacement procedure includes a plurality of femoral stem components in a range of various sizes and a plurality of femoral head component in a range of various sizes. The anterior/posterior stem taper angle of the femoral stem component varies across its range of sizes.

Abstract: A medical system (10) is provided having a pulling device (20) and an active substance chain (50). The active substance chain (50) has at least two storage units (51) arranged like a chain, and at least one of the storage units (51) is loaded with a medicinal active substance. The pulling device (20) has a grip element (30) and a coupling element (40), and the coupling element (40) has at least one recess (41, 41?). In a free position (100) the active substance chain (50) is arranged separated from the pulling device (20), while in an inserted position (110) at least one of the storage units (51) is arranged form-fitting in a recess (41, 41?). The active substance chain (50) can be moved reversibly from the free position (100) into the inserted position (110).

Abstract: An artificial cement-less hip prosthesis stem comprises an inner construct 7 which reacts with a load acting on a hip joint and an outer construct 8 for transmitting the load acting on the inner construct to a femur 1. The inner construct has an inner body 7B which reacts with the load transmitted from a neck 7A. The outer construct has both an outer body 8A which is bell mouth-shaped toward an epiphysis so as to surround the inner body 7B and a leg 8B extending toward a medullary cavity. The torsional rigidity given to the proximal end and the distal end of the outer body 8A and the leg 8B is regulated so as to be lower than the torsional rigidity given to an intermediate portion 18 of the outer body 8A.

Abstract: An artificial joint fixation mechanism has a base for being attached to an artificial joint, a stem for guiding an artificial joint to engage with a human bone, and a sleeve. The base defines a conic shaft hole therethrough. At least a positioning section and at least a threaded section are extended adjacent an end of the shaft hole. The stem includes an engaging pole at an end thereof for jointing to an artificial joint. The sleeve is threaded for screwing to the threaded section and defines an inner cone hole therethrough. In use, the engaging pole of the stem implants into the shaft hole. The sleeve is screwed to the threaded section, and the inner cone hole reversely pressing against the guiding section. Thus the stem is pressed reliably.

Abstract: A femoral prosthesis. The femoral prosthesis includes an implant body having a proximal end and a distal end and a shoulder at the proximal end, the shoulder being structured and dimensioned for a tight press fit into the neck of a femur. The implant body includes a trunk at the distal end, the trunk having a wedge formed by a tapered portion extending in the direction of the distal end of the implant body. The implant body also includes a medial column extending from the shoulder toward the distal end and a lateral column extending from the shoulder toward the distal end. The wedge, the medial column, and the lateral column to provide multi-planar stability for the implant body and surface area for fixation of the implant body.

Abstract: A femoral prosthesis. The femoral prosthesis includes an implant body having a proximal end and a distal end and a shoulder at the proximal end, the shoulder being structured and dimensioned for a tight press fit into the neck of a femur. The implant body includes a trunk at the distal end, the trunk having a wedge formed by a tapered portion extending in the direction of the distal end of the implant body. The implant body also includes a medial column extending from the shoulder toward the distal end and a lateral column extending from the shoulder toward the distal end. The wedge, the medial column, and the lateral column to provide multi-planar stability for the implant body and surface area for fixation of the implant body.

Abstract: Position reference members are provided as part of an orthopaedic implant system. Both position reference members can be implanted on or in the same bone as the other parts of the implant. One of the position reference members is fixed to the bone and the other position reference member is movable with another part of the implant, such as a stem received in the intramedullary canal. The movable position reference member can move with respect to the fixed position reference member. At least one of the position reference members includes indicia such as a main scale or a vernier scale. Parts of the indicia and position reference members are radio-opaque and parts are radiolucent. Post-operative changes in the relative positions of the position reference members can be measured by radiography or fluoroscopy so that changes in the implant position can be monitored over time.

Abstract: A modular prosthesis is provided having a first and second prosthesis component and a locking nut. The first prosthesis component is configured to include a mating surface and a threaded shaft extending from the mating surface. The locking nut is formed to include a distal end having a shaped surface. The second prosthesis component is configured to include a mating surface, a nut-receiving cavity and a bore. The mating surface of the second prosthesis component is configured to mate with the mating surface of the first prosthesis component. The nut-receiving cavity is configured to receive the locking nut therein and to have a shaped bottom wall configured to engage the shaped surface of the locking nut. The bore communicates with the nut-receiving cavity through the shaped bottom wall and the mating surface and is sized to receive the threaded shaft therethrough.

Abstract: A modular hip prosthesis, comprising: (a) a proximal segment including a neck lockingly engageable with a femoral head component and a male tapered portion; (b) a distal segment having a proximal end and a distal tip, the distal segment further formed with a male tapered portion adjacent the proximal end thereof; and (c) a metaphyseal segment having a proximal end and a distal end, the metaphyseal segment preferably including a bone engaging outer surface portion, and further including an axial bore therethrough, the axial bore including first and second female tapered portions formed adjacent the proximal and distal ends thereof, respectively. The first female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the distal segment.

Abstract: An orthopedic component comprising a first element and a second element, with the first element and the second element being secured to one another with a modular connection, wherein the modular connection comprises a taper junction and an engaged-fit junction.

Abstract: An intramedullary support strut for a long bone for a range of different applications including anchoring and fixation. The strut is in the form of nested telescopic members. In the retracted configuration, the strut is compact and may be inserted into position aligned with a shaft made in the medullary canal via a portal made in the lateral cortex of the bone. The strut may then be telescopically extended into the medullary canal to provide the required support.

Abstract: A modular prosthesis has an intramedullary rod element which is to be inserted in a bone, an artificial trochanter and a neck for carrying the ball. The intramedullary rod has a proximal end and a distal end telescoped together allowing free relative rotation of the ends. A split sleeve is fitted between the telescoped portions of the rod to form a rigid connection when the ends are separated longitudinally. A jack screw within the intramedullary rod separates theproximal end from the distal end.

Abstract: A cementless femoral hip stem component. The hip stem component includes an elongate stem, a proximal body, and a collar disposed on the proximal body and extending outward therefrom in a sideways direction to form a ledge. The proximal body defines at least a majority of a frustoconical shape. The ledge formed by the collar includes a tapered undersurface, beneath which extends the proximal body. The tapered undersurface of the ledge and the proximal body extend in different directions and thereby cooperatively define a double-flared contact surface configured to enable subsidable engagement of said double-flared contact surface with the femur at two different rates of subsidence within the femur. An abrupt, male corner is formed by the stem and the proximal body and is sufficiently abrupt to provide enhanced bone ingrowth stimulation.

Abstract: The present invention provides an improved method and apparatus for preparing a femur to receive a modular prosthetic femoral component. A distal reamer having a plurality of sets of depth marks is utilized to prepare the distal femoral canal. The sets of depth marks on the distal reamer correspond in number to the number of distal femoral stems available for use with the particular modular prosthetic femoral implant set. Each set of depth marks comprises a plurality of indicator rings corresponding in number to the number of proximal bodies adapted for utilization with the prosthetic femoral component set. Prior to distal reaming, the appropriate set of depth marks and indicator ring is chosen corresponding to the modular components the surgeon wishes to utilize. Reaming then takes place until the chosen indicator ring is aligned with a reference point (e.g., the top of the greater trochanter). Upon reaching the appropriate reaming depth, the distal reamer is left in place in the femoral canal.

Abstract: Milling tool for emptying the femoral medullary space, while creating a space for the shaft of a hip prosthesis, which comprises a flexible core and a plurality of conical, rotationally symmetrical milling segments, mounted in superimposed manner on the core and provided with a central through-bore, the milling segments being so connected to the core and/or the milling segments adjacent thereto, that a rotational force applied to the core and/or the upper segment is transferred to the individual milling segments, as well as a hip prosthesis with a conically directed shaft and a ball mounted on the proximal end of the shaft and which comprises a flexible core, a plurality of conical, rotationally symmetrically segments, mounted in superimposed manner on the core and provided with a central through-bore and a device for tensioning the core to bring a stiffening of the shaft formed from the individual segments.

Abstract: A modular femoral prosthesis includes a stem member adapted to be implanted into a medullary canal of a femur. The stem member has a continuously tapered elongated bore and a threaded aperture defined therein. A first end of the elongated bore defines a post-receiving opening. The post-receiving opening is defined in a proximal end surface of the stem member. The elongated bore extends between the post-receiving opening and a threaded aperture. The femoral prosthesis also includes a neck member having a neck body, a head-receiving support member secured to the neck body so as to extend outwardly therefrom, and a tapered post secured to the neck body so as to extend outwardly therefrom. The tapered post is adapted to be received into the elongated bore of the stem member. A method of performing a joint replacement procedure by use of a modular prosthesis is also disclosed.

Abstract: A prosthetic femoral component is located in a prepared socket in a femur which has been resected at a position on the proximal side of its neck. The component includes an insert portion and an enlarged proximal head portion the distal end of the head portion being adapted for location in the prepared socket. The component takes advantage of the bone at the periphery of the socket which enables the insert and the part of the head concerned to be accurately and firmly located in the bone. The presence of the bone at the outer edges of the socket helps to stabilize the component. The insert portion can be dimensioned to pass through the neck of the femur with which it is to be used or to be shorter depending upon the requirements.

Abstract: A prosthetic femoral stem component comprising a body element, a neck element and a stem element, with the body element, neck element and stem element being secured to one another with a modular connection, wherein the modular connection comprises a taper junction and an engaged-fit junction.

Abstract: A modular hip prosthesis, comprising: (a) a proximal segment including a neck lockingly engageable with a femoral head component and a male tapered portion; (b) a distal segment having a proximal end and a distal tip, the distal segment further formed with a male tapered portion adjacent the proximal end thereof; and (c) a metaphyseal segment having a proximal end and a distal end, the metaphyseal segment preferably including a bone engaging outer surface portion, and further including an axial bore therethrough, the axial bore including first and second female tapered portions formed adjacent the proximal and distal ends thereof, respectively. The first female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the distal segment.

Abstract: A modular prosthesis has an intramedullary rod element which is to be inserted in a bone. The rod has a shaped proximal portion which is telescoped into one end of a bore in the body element. The mating surfaces of the shaped rod and the body bore form a rotationally immovable connection. A neck element is telescoped into the other end of the body bore. The neck and the body have mating planar surfaces visually discernable as being spaced apart. The neck and body have complementary tapered walls. The prosthesis is subjected to compression to eliminate the visual gap and produce a rigid area seal. All the elements are secured together by a compression screw through the neck, body and rod.

Abstract: A femoral component for a hip replacement joint having a tapered collarless stem for being cemented in a medullary canal. The proximal portion of the stem has a taper and the distal segment is generally circular in cross-section and has a length equal to or greater than the proximal portion. The component can be made in two separate pieces and can be coupled in the metaphysical area of the femur. In one embodiment, at the proximal end of the stem, there is a pronounced laterally projecting heel adapted to extend into the greater trochanter of the femur of the femur into which it is to be filled. Thus, the distal facing part of the heel can provide a lateral portion which is greater than that of known collarless stems and which is particularly adapted to resist torque. In order to fit the femoral component in the medullary canal, it is necessary to broach the medullary canal so that there is a cavity within the greater trochanter.

Abstract: A modular hip prosthesis, comprising: (a) a proximal segment including a neck lockingly engageable with a femoral head component and a male tapered portion; (b) a distal segment having a proximal end and a distal tip, the distal segment further formed with a male tapered portion adjacent the proximal end thereof; and (c) a metaphyseal segment having a proximal end and a distal end, the metaphyseal segment preferably including a bone engaging outer surface portion, and further including an axial bore therethrough, the axial bore including first and second female tapered portions formed adjacent the proximal and distal ends thereof, respectively. The first female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the proximal segment. The second female tapered portion of the metaphyseal segment is dimensionally configured to lockingly engage the male tapered portion of the distal segment.

Abstract: A modular prosthesis has an intramedullary rod element which is to be inserted in a bone. The rod has a shaped proximal portion which is telescoped into one end of a bore in the trochanter element. The mating surfaces of the shaped rod and the trochanter bore form a rotationally immovable connection. A neck element is telescoped into the other end of the trochanter bore permitting rotational adjustment. All the elements are locked together by a bolt through the neck and rod.

Abstract: Milling tool for emptying the femoral medullary space, whilst creating a space for the shaft of a hip prosthesis, which comprises a flexible core and a plurality of conical, rotationally symmetrical milling segments, mounted in superimposed manner on the core and provided with a central through-bore, the milling segments being so connected to the core and/or the milling segments adjacent thereto, that a rotational force applied to the core and/or the upper segment is transferred to the individual milling segments, as well as a hip prosthesis with a conically directed shaft and a ball mounted on the proximal end of the shaft and which comprises a flexible core, a plurality of conical, rotationally symmetrically segments, mounted in superimposed manner on the core and provided with a central through-bore and a device for tensioning the core to bring a stiffening of the shaft formed from the individual segments.

Abstract: A bone attachment assembly for a remaining portion of a long bone diaphysis following resection is provided. The assembly includes a main body, means for anchoring the device with respect to the remaining bone portion, such as an anchor body, and means for attaching the main body to the means for anchoring. The means for attaching the main body may preferably be in the form of one or more washer springs retained upon a connecting rod attached to the means for anchoring. The assembly may be connected to an orthopedic appliance, an interposed orthopedic appliance connected to a second bone attachment assembly, or a transcutaneous bar for attaching an external appliance. A reaming device for creating an intramedullary cavity, a guide device for guiding an aperture-forming procedure in a remaining bone portion, and a milling device for shaping an interface surface of the bone in a preselected geometry are also provided.

Abstract: A modular artificial hip joint includes a head part and at least one shaft part. The shaft part, which can be driven into the bone and forms the distal region, is connected to the distal end of the head part by insertion, preferably by means of an insert cone. A first screw or tie rod, guided through an axial bore in the head part, can be screwed into the threaded bore in the shaft part. In order to guide a second screw for separating the conical insert connection between the individual components of the artificial joint, the bore in the head part is threaded and has a diameter which is greater than the diameter of the threaded bore in the shank part.

Abstract: A prosthetic stem insertable in an intramedullary cavity to support an articulation component includes a proximal neck portion and a distal root portion. The proximal neck is solid metal and extends for a length effective to reach into the cavity and couple to surrounding bone for load bearing engagement therewith, while the distal root portion includes a stranded cable which fills the bone cavity but flexes to avoid significant transfer of bending stresses. The cable is tightly bunched at its junction with the neck, providing a transitional degree of stiffness to its distal part which is significantly more flexible and bends to accommodate natural displacement of the surrounding bone. The prosthesis may be formed of a compatible metal such as titanium, cobalt chromium, stainless steel or the like. The prosthesis has a section modulus characterized by three distinct regions.

Abstract: A prosthetic trial for a femur includes a curved stem rotatably engaged with a body that defines a trunnion. A locking mechanism inhibits rotation of the body with respect to the stem. The trial is configured for either left or right femoral implantation by rotating the stem with respect to the body to orient the stem in the appropriate direction.