Abstract: A hemi-arthroplasty bone joint implant has a first part (120) with a stem (111) tor intramedullary implanting into a metacarpal, and 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 toral 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 orthopedic drill bit includes a cutting head formed to include diametrically opposed cutting lips leading to a central point and away to a radiused periphery to center said bit. The drill includes flutes extending from a cutting end, said flutes having a dulled periphery to prevent out of round holes. The flute design increases in width progressively from the tip up the shank, to maintain an adequate and unrestricted space for chips to easily move upward, preventing the chips from being compressed into a smaller opening while maintaining the tapered depth of the flutes for strength.

Abstract: Disclosed is a wrist prosthesis, and methods for implanting same, the prosthesis comprising radial component having two sides, the first side comprising a stem and the second side comprising a concave dish; a carpal component having two sides, the first side comprising a stem, and the second side comprising a ball end, the ball end being connected to the carpal component through a neck, the neck being narrower than the diameter of the ball end; and a lunate component having two sides, the first side comprising a cavity adapted to receive said carpal component's ball end, and the second side comprising a convex surface adapted to engage said radial component's concave dish.

Abstract: The present invention discloses a bionic artificial interphalangeal joint. The bionic artificial interphalangeal joint includes three sets of proximal prostheses and distal prostheses matched with the proximal prostheses and respectively corresponding to the three joints from the metacarpal bone to the distal phalanx. According to the specific position of the joint to be replaced, the corresponding artificial interphalangeal joint can be selected for replacement. Among them, the bionic artificial interphalangeal joint that can be installed between the metacarpal bone and the proximal phalanx has multiple degrees of freedom, which allows the proximal phalanx to bent in any direction like a real finger, and the bending angle of the proximal phalanx can be up to about 90 degrees when the proximal phalanx is bent toward the inner side of the finger.

Abstract: A prosthesis for reconstruction of a distal radioulnar joint, after resection of a part of the ulna, includes a first prosthesis member, fixation members and a second prosthesis member. The first prosthesis member is configured for fixation to the distal end portion of the ulna. The fixation members are configured to extend into the radius via said distal end portion of the ulna for locking said distal end portion of the ulna to the radius. The second prosthesis member is configured for fixation to the ulna close to said distal end portion of the ulna. The second prosthesis member is also configured to extend into said space for being joined with the first prosthesis member in a manner which allows said first and second prosthesis members to at least pivot and rotate relative to each other.

Abstract: A method and a corresponding device is proposed, for determining a location on a bone surface and for performing a simulation of an insertion of an implant based on the determined location. The simulation may comprise the steps of identifying an implantation axis of the bone in the first image, and aligning a visualization of the implant with the implantation axis, with respect to the determined location.

Abstract: Disclosed is a wrist prosthesis, and methods for implanting same, the prosthesis comprising an elongated radial component having two opposite sides, the first side comprising a stem and the second side comprising a concave dish; an elongated carpal component having two opposite sides, the first side comprising a stem, and the second side comprising a ball end; a lunate component having two opposite sides, the first side comprising a cavity adapted to receive said carpal component's ball end, and the second side comprising a convex surface adapted to engage said radial component's concave dish; wherein said lunate component freely rotates and swivels with respect to both of said carpal and radial components; wherein said stem of said carpal component is adapted for rigid engagement with one or more carpal and/or metatarsal bones; and wherein said stem of said radial component is adapted for rigid engagement with a radius bone.

Abstract: A radiocarpal wrist joint replacement includes a radial member configured to be affixed to a portion of an end of the radial bone proximal to the wrist including a fixture to be affixed over a longitudinal aspect of the radial bone and a radial resurfacing plate having a substantially concave surface configured to be located at the end of the radial bone. A carpal capitate bone insert configured to be inserted and affixed into the carpal capitate bone. A bulbous component includes a first convex head and a second convex head, substantially opposite each other and connected by a neck defining an annular groove between the first convex head and the second convex head. The carpal capitate bone insert is configured to be flexibly coupled to the first convex head of the bulbous component. The radial resurfacing plate of the radial member with the concave surface is configured to be operably coupled to the second convex head of the bulbous component so as to allow radial freedom of motion in the joint replacement.

Abstract: A wrist implant requires minimal resection of the distal radius and preserves the sigmoid notch and articulation with the head of the distal ulna. The wrist implant generally includes a radius portion, a carpal portion and a carpal ball. The wrist implant includes a primary articulation and a secondary rotational articulation. The primary articulation occurs between the radius portion and the carpal ball. The secondary articulation occurs between the carpal ball and the carpal portion.

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: A multi-component wrist joint assembly incorporated into reconditioned end surfaces established between an upper radius bone and at least opposing lower scaphoid and lunate bones. A first component is anchored into the upper radius reconditioned end surface and exhibiting a first exposed support surface. A second component is anchored into the lower scaphoid and lunate reconditioned end surfaces and exhibiting a second exposed support surface. A spherical shaped intermediate component is supported in at least one of eccentric or rotational fashion between the first and second anchored components.

Abstract: An implant for carpal hemiarthroplasty includes an articular component having a convex articular surface shaped to generally conform to an unresected distal end of a radius bone. A bearing component is rigidly fixed to the articular component opposite the convex articular surface and has a bearing surface. A carpal plate is rotatably attachable to the bearing component and has a proximal surface and a distal surface. The proximal surface has a contour that substantially conforms to the bearing surface.

Abstract: A carpometacarpal prosthesis system generally includes a trapezial implant for replacing an excised trapezium within a human hand and a component stem implant for replacing a partially excised first metacarpal. The component stem implant is adapted to be press fit within the medullary cavity of the partially excised 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: A carpal plate for use in a wrist replacement prosthesis includes at least three non-linearly aligned, internally threaded openings, each opening defining a thread-screw axis with at least one thread-screw axis divergent from the other two thread-screw axes; and further including hollow core screws for the injection of a cement compound to aid in anchoring the screws into the cancellous portion of the carpal bones.

Abstract: A multi-component wrist joint assembly incorporated into reconditioned end surfaces established between an upper radius bone and at least opposing lower scaphoid and lunate bones. A first component is anchored into the upper radius reconditioned end surface and exhibiting a first exposed support surface. A second component is anchored into the lower scaphoid and lunate reconditioned end surfaces and exhibiting a second exposed support surface. A spherical shaped intermediate component is supported in at least one of eccentric or rotational fashion between the first and second anchored components.

Abstract: A wrist replacement prosthesis includes a radial brace member to be secured to the radius bone, an ulna brace member to be secured to the ulna bone, and an articular member to be secured to the carpal bones, the radial brace member and articular member having wide ellipsoidal surfaces, and the ulnar brace member having a ball at one end which is supported by the radial brace member.

Abstract: A total wrist and distal radioulnar joint replacement prosthesis includes a radial brace member to be secured to the radius bone, an ulna brace member to be secured to the ulna bone, and an articular member to be secured to the carpal bones. The articular member is slidably received in a socket in the radial brace member and is supported by the ulna bone.

Abstract: A first carpometacarpal joint implant. One embodiment of the invention includes proximal and distal components. The proximal component includes a fixation portion for attachment to one or more elements of a patient's distal carpal row, a ball-type joint portion cantilevered off the fixation portion, and a skid having a concave surface opposite the ball-type joint for engaging a patient's scaphoid bone. The distal component has a fixation portion for attachment to a patient's thumb metacarpal, and a socket-type joint portion that cooperates with the ball-type joint portion of the proximal component.

Abstract: System, including methods, apparatus, and kits, for connecting bones and/or bone portions using a bone connector with a pivotable ball and socket joint.

Abstract: A joint prosthesis has two prosthesis members (2, 3) and each prosthesis member (2, 3) includes a first and a second screw-like member (4, 5) adapted to be screwed onto a respective bone (39, 41, 42). One prosthesis member (2) includes a member (6) having a socket and the other prosthesis member (3) a member (7) having a head. The socket member (6) has a mounting pin (22) insertable into a first hole (10) in the first screw-like member (4) and the head member (7) has a mounting pin (27) insertable into a first hole (11) in the second screw-like member (5). In the first as well as in the second screw-like member (4, 5) there is provided at least one inner second hole (30 and 33 respectively) designed to permit insertion thereinto of a rod (31) of a screw tool (32) in order to secure by screwing the first and second screw-like member (4, 5) respectively, at the respective bone (39, 41, 42).

Abstract: A proximal radioulnar joint (lateral elbow) prosthesis includes a radial brace member to be secured to the radius bone and an ulna brace member to be secured to the ulna bone. The radial brace member has a ball at its proximal end, and the ulnar brace member defines a curved cavity which receives and rotationally supports the ball.

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: A wrist implant requires minimal resection of the distal radius and preserves the sigmoid notch and articulation with the head of the distal ulna. The wrist implant generally includes a radius portion, a carpal portion and a carpal ball. The wrist implant includes a primary articulation and a secondary rotational articulation. The primary articulation occurs between the radius portion and the carpal ball. The secondary articulation occurs between the carpal ball and the carpal portion.

Abstract: The invention concerns a wrist prosthesis wherein the surfaces of the spherical caps of the base plates of the lateral rods are pressed against the corresponding concave surfaces of the seat under the action of the spindle made of elastic material maintained in extension between the two pairs of half-locks. Each of the pairs of semi-cylindrical elements is maintained assembled by being engaged from outside inwards in the central passage of one of the rods and locks one of the cylindrical ends of the central part of the spindle. The central rod is engaged by its shaft in a transverse blind bore of the seat and the groove provided in the flanks of its slot is clipped on the rim of the spindle.

Abstract: A distal component for a wrist prosthesis that utilizes fixation within the carpus complex, incorporates features that improve the probability of intercarpal fusion and allows modularity of articulating components. In one form, the subject invention includes an ovoid fixation plate having three holes and a boss. The three holes allow attachment of stems and/or screws distally for fixation in the carpus. The boss projects proximally from the plate, and serves as an attachment point for the articulating head. Modularity of the fixation and articulating components allow a surgeon many options for optimizing fixation distally, and articulation proximally. The proximal head of the distal component is designed to articulate with existing radial components. Since the proximal head of the distal component is modular, however, the head can be redesigned to accommodate later design changes in proximal components.

Abstract: A wrist prosthesis has first, second, and third components that in one form are a radial component, a metacarpal component, and a bearing component. The bearing component is non-fixed or non-stationary relative to one of the radial component and the metacarpal component when the wrist prosthesis is assembled such as when implanted into a patient. As such, in one form a rotational joint or union is provided on the radial component and the bearing component. The bearing component is thus free to rotationally ride on the radial component, preferably 360° thereabout. Distal the radial component, the bearing component includes an articulation surface. The metacarpal component includes an articulation surface that is complementary to the articulation surface of the bearing component. In this manner, the metacarpal component correspondingly moves relative to the bearing component. The bearing component is preferably made of a polymer such as polyethylene.

Abstract: A wrist prosthesis has distal and proximal sections, which are connected with one another by a curved bearing.

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 (1) and comprising a concave joint shell (2) which can be fastened independently of one another with a respective shaft (3, 4) in a bone end (5, 6) and which can be moved in an articulation plane from an extension position (7) with parallel shaft axes (8, 9) into a hyperextension position (10) or into an articulation end position (11). A guide pin (12) projects out of the joint shell (2) in the direction of its shaft axis (9) and protrudes into a pocket (13) of the joint head (1), with the pocket (13) having a first abutment (16) for the guide pin (12) in the hyperextension position (10). A second abutment (17) between the joint shell (2) and the joint head prevents a tilting of the guide pin (12) and shaft (4) of the joint shell (2) about the first abutment (16) in the hyperextension position (10).

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