Abstract: A hemi-arthroplasty bone joint implant has a first part (120) with a stem (111) tor intramedullary implanting into a metacarpal, mid a second part (110) to engage the trapezium is a translational manner, a hemi-arthroplasty articulating coupling (121). This allows multi-axial motion with translational movement of the second part over the trapezium and rotation of the first part (110) about the articulating coupling (121, 103). There is also a converter to convert the implant to a total arthroplasty implant in situ during revision surgery. The second part (110) and the hemi-arthroplasty coupling (100, 123, 121) are removable in situ during revision surgery. The first part (120) has an engagement threaded socket (117) for, after removal of the second part and the hemi-arthroplasty coupling, engaging the replacement coupling (200) and allowing mutual articulation of the first (120) and replacement parts (220). This forms a total arthroplasty joint implant.

Abstract: An MTP joint fusion device is disclosed which stabilizes the fusion site without the use of a fusion plate. Further, the MTP joint fusion device comprises an MTP head replacement component placed over the distal end of the first metatarsal. This portion of the device contains the bone ingrowth matrix. An intramedullary screw is driven through the distal central portion of the device into the base of the proximal phalanx of the hallux. At least two metatarsal screws are driven radially through the device into the metatarsal neck area. This secures the MTP head replacement component to the metatarsal at a specifically determined angle. Thus, the MTP joint fusion device provides for a more secure fusion environment, increased capacity for bone ingrowth, less potential for irritation from retained hardware, and earlier weight bearing as compared to traditional methods.

Abstract: The invention relates to an attachment member (2) and a connecting member (16) for a carpometacarpal thumb joint prosthesis (1) as well as to said thumb joint prosthesis. The attachment member (2) comprises a screw-like part (4) for attachment by screwing into the second metacarpal bone and a locking device (8) for locking the screw-like part to the connecting member (16). The connecting member comprises an elongated, arcuate element (16) which at one end portion (16a) thereof is configured with a hole (14) for connection to the attachment member (2) for the second metacarpal bone and which at the opposite end portion (16b) thereof is configured with a hole (15) for connection to an attachment member (3) for the first metacarpal bone.

Abstract: A carpometacarpal prosthesis system generally includes a trapezial implant for replacing an excized trapezium within a human hand and a component stem implant for replacing a partially excized first metacarpal. The component stem implant is adapted to be press fit within the medullary cavity of the partially excized first metacarpal bone of the human hand; the component stem when so implanted is adapted to effect universal movement of the first metacarpal bone relative to the trapezial implant thereby providing a restructured thumb metacarpal joint that restores substantially normal thumb function in terms of strength and flexibility.

Abstract: An orthopedic device and method of use are provided that incorporate complex, non-spherical articulating surfaces to allow a greater available range of motion compared with existing artificial shoulder joint and artificial hip joints. According to some embodiments, complex, non-spherical articulating surfaces can be incorporated on a humeral head and/or glenoid of a shoulder prosthesis. In other embodiments, complex, non-spherical articulating surfaces can be incorporated on the acetabulum and/or femoral head of a hip prosthesis. These non-spherical surfaces can be used to adjust constraint, joint thickness, soft tissue tension, moment and arc of motion, and in doing so, influence motion.

Abstract: A layer applied to a joint defined surface including a general mat shape body exhibiting a plurality of recesses, such that abrading contact with an opposing joint surface creates debris which are entrapped within the recesses during a normal range of motion. The body can further exhibit a first harder plastic substratum and a second softer plastic surface. The recesses further incorporate undercut defined patterns selected from any of circular, linear and arcuate designs.

Abstract: An intramedullary anchoring stem for an orthopaedic implant head. The stem is in one piece, is made of biocompatible material and is movable in relation to the head, with which it has connecting means, and it has a truncated or substantially truncated peg shape at least partially recessed longitudinally, and parallel or substantially parallel to the dorso-palmar plane.

Abstract: A basal joint of the thumb prosthesis includes a socket element to be secured to the trapezoid and capitate, and a metacarpal component to be secured to the first metacarpal. A ball on the metacarpal component is received and substantially enclosed by the socket element.

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 basal joint of the thumb prosthesis includes a socket element to be secured to the trapezoid and capitate, and a metacarpal component to be secured to the first metacarpal. A ball on the metacarpal component is received and substantially enclosed by the socket element.

Abstract: A multi-component thumb joint assembly incorporated into reconditioned end surfaces established between upper metacarpal and opposing lower proximal phalanx bones. A first component is anchored into a reconditioned end surface of the metacarpal bone and exhibits a first exposed support surface. A second component is anchored into a reconditioned end surface of the proximal phalanx and exhibits a second exposed support surface. An intermediate and spherical shaped component is supported in at least one of eccentric or rotational fashion between the first and second anchored components.

Abstract: Thumb carpometacarpal (CMC) joint implants include a trapezium implant defining an articulating surface and a cooperating first metacarpal implant with a base portion of the first metacarpal defining an articulating surface. The first metacarpal base articulating-surface is configured to articulate against the trapezium implant articulating surface.

Abstract: The present invention relates to a joint prosthesis (1) comprising two prosthesis components (2, 3) intended to be applied respectively to the trapezium (38) and the first metacarpal bone (39) of a thumb joint, each prosthesis component having a first or second screw-like part (4, 5) intended to be screwed firmly or be fastened to one of said bones (38 or 39) by means of bone cement, the one prosthesis component (2) having an articulating socket element (6) and the other prosthesis component (3) an articulating ball element (7). The fact that at least the prosthesis component (2) with the socket element (6) has an abutment portion (20) for abutment against the bone to which the screw-like part (4) of the prosthesis component is intended to be firmly screwed or be fastened by means of bone cement, normally the trapezium (38), prevents this prosthesis component from sinking into said bone.

Abstract: An artificial joint for implantation in humans and animals, the joint comprising a joint body arranged between two base elements which are adapted to be connected to adjoining bone parts. The two base elements comprise horizontal and vertical retaining members respectively, that hold the joint body between them.

Abstract: A method and apparatus for a prosthesis. At least a portion of the prosthesis is made from a ceramic that is treated with ion implantation, which causes a controllable, bilateral compressive stress of the ceramic. A diamond-like-coating (DLC) can be coated on the ceramic and in the same chamber as the ion implantation. After treating by ion implantation and coating with DLC, the ceramic will be strengthened and have a low coefficient of friction and thereby be made much less likely to fracture under load.

Abstract: The present invention provides an artificial joint which can be rapidly, securely and easily fixed while being suited to an inner surface of a bone marrow hole by a novel structure absolutely different from the conventional one. An artificial joint is provided with a stem base portion (10) in which a desired head (2) and a desired socket (5) are in slidably contact with each other in a freely bending manner, stems (9, 16) are fitly attached to free ends of the head (2) and the socket (5) respectively, and the respective stems (9, 16) have therein locking screws (14) freely screwing to move along axial directions thereof, and a pair of stem pieces (15) having an elasticity provided to protrude on both front portions of the stem base portion (10), and the locking screws (14) are forcedly inserted within the stem pieces (15) so as to expand them outward, thereby making them tightly contact with and fix to inner surfaces of bone marrow holes (19, 21).

Abstract: According to the state of the art, the replacement of a basal finger joint is effected by, for example, interposition of soft part tissue or a distance piece, which does not, however, constitute a replacement joint. In joint prostheses with a metal-metal sliding combination, but in particular with a metal/polyethylene sliding combination, wear of the material can lead to osteolyses at the bone ends. Owing to the fact that the metal or plastic joint prostheses known from the state of the art are as a rule multipart, loosening of the individual components can occur, which shorten the service life of the implant.

Abstract: The present invention relates to a modular prosthetic joints in general and in particular to a finger or toe joint assembly and method for implanting this assembly using a transosseous core approach. An exemplary modular finger joint implant and method are provided wherein individual modules can be passed through a relatively small bone hole and implanted without cutting the collateral ligaments connecting two adjacent finger bones.

Abstract: A prosthesis for a metacarpophalangeal joint comprises a metacarpal plug member, a metacarpal insert member, and a phalangeal insert member. The metacarpal plug member comprises an elongate body which generally tapers from a proximal end to a distal end, an axial bore, and a plurality of axially spaced first fins projecting from the elongate body. The metacarpal insert member comprising a head portion having a convex articulating surface and a stem portion. The phalangeal insert member comprises an enlarged proximal end portion and an elongate shaft portion. The enlarged end portion is provided with a concave articulating surface substantially congruent with the convex articulating surface of the metacarpal insert member, and the elongate shaft portion tapers generally towards a distal end of the phalangeal insert member, and is provided with a plurality of axially spaced second fins projecting therefrom.

Abstract: A prosthesis (2) for replacing a joint between first and second articulating bones (10, 12), the prosthesis comprising first and second joint members (4, 6) and wherein: the first joint member includes a first mounting member (26) which in use is mounted in an intramedullary canal (22) of the first bone; the second joint member includes a second mounting member (28) which in use is mounted in an intramedullary canal (27) of the second bone; the first joint member has a ball (30) having a first part spherical surface and a slot (34) extending transversely through the ball; the second joint member has a socket (52) having a second part spherical surface which is complementary to first spherical surface and a guide peg (60) which projects from the second spherical surface and in use is located in said slot; and wherein the guide peg is loose fit within the slot thereby permitting biaxial rotation of the second member relative to the first member about at least first and second axes (14, 16).

Abstract: The present invention provides an artificial joint which can be rapidly, securely and easily fixed while being suited to an inner surface of a bone marrow hole by a novel structure absolutely different from the conventional one. An artificial joint is provided with a stem base portion (10) in which a desired head (2) and a desired socket (5) are in slidably contact with each other in a freely bending manner, stems (9, 16) are fitly attached to free ends of the head (2) and the socket (5) respectively, and the respective stems (9, 16) have therein locking screws (14) freely screwing to move along axial directions thereof, and a pair of stem pieces (15) having an elasticity provided to protrude on both front portions of the stem base portion (10), and the locking screws (14) are forcedly inserted within the stem pieces (15) so as to expand them outward, thereby making them tightly contact with and fix to inner surfaces of bone marrow holes (19, 21).

Abstract: A finger joint prosthesis for MP joint or PIP joint in which a socket has an opening at a portion thereof and a spherical face on an inner side thereof and is integrally formed with a stem on a side opposed to the opening, a head has a spherical portion fit to the spherical face via the opening and is integrally formed with a stem extending outwardly from the opening and a sheath for surrounding the stem of either of the socket and head is provided and the stem is movable slidably in an axial direction by adhering and fixing the sheath to a narrow cavity at a nearly disposed portion or a remotely disposed portion whereby the joint prosthesis is matched with motional characteristic of finger.

Abstract: The invention shows an artificial finger joint comprising a convex joint head and comprising a concave joint shell which can be fastened independently of one another with a respective shaft in a bone end and which can be moved in an articulation plane from an extension position with parallel shaft axes into a hyperextension position or into an articulation end position. A guide pin projects out of the joint shell in the direction of its shaft axis and protrudes into a pocket of the joint head, with the pocket having a first abutment for the guide pin in the hyperextension position. A second abutment between the joint shell and the joint head prevents a tilting of the guide pin and shaft of the joint shell about the first abutment in hyperextension position.

Abstract: The joint prosthesis includes a first part with a cylindrical socket and a second part with a cylindrical head. The cylindrical head and socket are of complementary form, in such a manner that together they are able to form a linear hinge. The cylindrical socket extends over at most 180° in the circumferential direction. The cylindrical head is provided with a radial thickened section which extends in the circumferential direction. The cylindrical socket is provided with a radial recess which extends in the circumferential direction and in which the radial thickened section can be accommodated, with the cylindrical head in bearing contact inside the cylindrical socket. The radial thickened section and radial recess are arranged centrally and are formed so as to be self-aligning with respect to one another.

Abstract: A prosthesis system for partial or total articular surface replacement includes a tail module having one or more grooves at one end thereof and a first ball joint component at an opposite end thereof; an articular module, a portion of which has an anatomic shape of a distal radial articular surface, another portion of which is provided with a second ball joint component; and a collar module interposed between the tail module and the articular module, and comprising a pair of sockets adapted to receive the first and second ball joint components of the tail module and articular module