Abstract: In an artificial knee joint implant, an increase in constraint force of a femur component and a tibia component in the anterior-posterior direction and the left-right direction of a patient is enabled, and an increase in an allowable degree of medial pivot motion is enabled. An artificial knee joint implant has a femur component to be fixed to a distal portion of a femur of a patient, and a tibia component to be fixed to a proximal portion of a tibia of the patient. Femur sliding faces of the femur component and tibia sliding faces of the tibia component each include a region in which the curvature radius varies in a predetermined direction.

Abstract: Provided is a surgical assistance apparatus and so on that make it possible to more accurately check the state that an affected part is to be in after a surgical operation has started, in advance of the surgical operation. A surgical assistance apparatus includes an image processing unit. The image processing unit creates projection image data based on measurement data that has been obtained by measuring an affected part of a patient, and thus creates a projection image as an image that is specified by the projection image data. This projection image is an image that is to be projected onto the patient, and includes an image that shows a state that the affected part is to be in after a surgical operation has started.

Abstract: A vertebral surgery instrument includes: an engagement part for engaging with a pair of opposing parts provided on or attached to a vertebral implant in a state in which the vertebral implant is fixed to a vertebra, the pair of opposing parts forming a slit into which a fixation rod for fixing a plurality of vertebrae to each other is to be inserted; and a pair of guide parts that are provided integrally with or attached to the engagement part. The pair of guide parts are formed extending so as to separate from each other toward a side on which the fixation rod is to be inserted, in a state in which the engagement part is engaged with the pair of opposing parts, and the slit and a guide passage that is formed between the pair of guide parts are in communication with each other.

Abstract: An object of the present invention is to provide a method of producing a bearing material having excellent wear-resistance and oxidation resistance. The method of producing a bearing material 10 according to the present invention comprises molding a substrate 12 containing a radical scavenger and a polymer material; washing at least a part 16 of the substrate 12 with a washing liquid; and grafting a polymer chain having a phosphorylcholine group from at least the part 16 of the surface after washing so as to form a polymer film 30 on at least the part of the surface.

Abstract: The instrument for artificial knee joint replacement surgery includes a holding mechanism that includes a holding portion having a contact portion to be brought into contact with a contact target of a patient on whom artificial knee joint replacement surgery is to be performed and that holds the patient in a state in which the contact portion is in contact with the contact target, and an indicating mechanism that is attached to the holding mechanism and includes a position identification target indicating portion to be arranged at a position corresponding to a position identification target in a state in which the holding mechanism holds the patient. The position at which the position identification target indicating portion is to be arranged is determined based on a positional relationship between the contact target and the position identification target that is obtained in advance prior to surgery.

Abstract: A measurement instrument for joint surgery may relatively move a first bone and a second bone, which are connected by soft tissue at a joint, in directions other than directions in which these bones are separated from each other, and measure the stability of a connection state between these bones. A housing may be fixed to a first bone. A slider may slide relative to the housing, and abut against a second bone. A position display portion displays the position of the slider relative to the housing. A measurement instrument for joint surgery relatively moves the second bone relative to the first bone along a joint face by the slider sliding relative to the housing. The stability of a state of connection between the first bone and the second bone is measured based on the position of the slider relative to the housing displayed by the position display portion.

Abstract: Provided is a measuring instrument for use in artificial knee joint replacement surgery that can perform knee joint alignment measurement more accurately. A measuring instrument for use in artificial knee joint replacement surgery includes a guide section. The guide section is used to indicate, from the outside of a patient, the position of a femoral head center of a hip joint of the patient. The guide section indicates the position of the femoral head center while being arranged based on preliminarily measured relative positions of an anterior superior iliac spine and the femoral head center of the patient. The anterior superior iliac spine is viewable from the outside of the patient.

Abstract: To provide a prosthetic member that is less likely to degrade its mechanical properties even when using it in the presence of squalene, and a method of producing the same. The prosthetic member in the present invention includes a substrate exhibiting excellent antioxidant properties and including an antioxidant and a polymer material, and a polymer film(s) covering a surface of the substrate and comprising a (meth)acrylate compound. The method for producing the prosthetic member in the present invention includes the steps of: forming a substrate comprising an antioxidant and a polymer material, cleaning a surface of the substrate with a cleaning liquid, and covering the cleaned surface of the substrate with a polymer film(s) comprising a (meth)acrylate compound.

Abstract: This contact-angle measurement method is a contact-angle measurement method for measuring a contact angle (?) between a droplet that is supplied to a sample curved surface and the sample curved surface. This method includes an apparent contact-angle calculation step of calculating an apparent contact-angle (?) of the droplet by using a captured image of the droplet supplied to the sample curved surface and the sample curved surface; an inclination angle calculation step of calculating an inclination angle (?) of the sample curved surface at an outer periphery portion of a contact portion between the droplet and the sample curved surface by using the captured image; and a contact-angle calculation step of calculating the contact angle (?) by correcting the apparent contact angle (?), using the inclination angle (?).

Abstract: The present invention provides a PS-type artificial knee joint implant, with which the gap balance can be adjusted in order to realize a stable deep flexion movement, the burden on a surgeon and a patient can be reduced, and the patient can perform a natural flexion movement. An artificial knee joint implant 1 includes femoral components, one of which is selected and attached to a distal portion of a femur of the patient, and tibial inserts, one of which is selected and attached to a proximal portion of a tibia of the patient. The femoral components have a cam portion that is disposed between posterior portions of two femoral joint faces, respectively. The tibial inserts have posts that can be brought into contact with the cam portion. The posts have different antero-posterior positions.

Abstract: Provided is an artificial knee joint implant with which the balance between ligaments can be properly adjusted. An artificial knee joint implant includes a plurality of types of tibial plates-having tibia-side sliding faces that slide against femoral components and respectively having at least either the tibia-side sliding faces at different positions with respect to a tibia in a state where the tibial plates are fixed to a tibial tray attached to a tibia, or the tibia-side sliding faces in different shapes.

Abstract: The present invention provides a medical ceramic material with a color other than black or white, especially blue, with which it is possible to secure sufficient durability and to maintain a good appearance by sufficiently suppressing a color difference between before and after the irradiation of gamma-rays for sterilization. The medical ceramic material is formed using a composite material containing alumina and zirconia. The composite material contains cobalt oxide. The content of cobalt oxide is set to be 0.2 wt % to 1.0 wt % with respect to 100 wt % of the composite material excluding cobalt oxide.

Abstract: An artificial hip joint stem of the present invention includes a stem body divided into a stem proximal part, a stem distal part, and a stem intermediate part located between the stem proximal part and the stem distal part. The stem body includes a rough surface located at the stem proximal part and having a surface roughness (Ra) of 10-80 ?m, a smooth satin surface located at the stem intermediate part and having a surface roughness (Ra) of 0.1-1.0 ?m, and a shiny surface located at the stem distal part and having a surface roughness (Ra) of less than 0.1 ?m. The present invention also provides an artificial hip joint including the artificial hip joint stem.

Abstract: An extender is removed from a spinal implant without using a separate device, and the loss of materials to be discarded is reduced. A head part of a spinal implant includes a base part, which is provided as a portion on a screw part side, and a pair of tab parts, which extend from the base part to an opposite side to the screw part side. The pair of tab parts have a tab part-side engagement part to be engaged by an extender-side engagement part that is formed on the extender. A weak part is formed between the base part and the pair of tab parts, the weak part being configured to be broken by an external force from the extender engaged with the pair of tab parts and separate the pair of tab parts from the base part.

Abstract: A femoral component trial for a knee joint of the present invention includes a trial body. The trial body includes a medial condyle and a lateral condyle that are located away from each other on an external surface, a through hole that is located between the medial condyle and the lateral condyle and has an approximately rectangular shape whose long side is an outer edge of an inner wall located along a back-and-forth direction and whose short side is an outer edge of an inner wall located along a right-and-left direction in an external surface view, a first guide slit that is located ahead of and above the through hole and extends in the right-and-left direction, and four second guide slits respectively extending from four corner parts of the through hole and along the long side.

Abstract: An object is to provide a medical device having excellent antithrombotic and sliding characteristics, which can exert a cell adhesion inhibitory effect. A medical device comprising: a substrate capable of forming hydroxyl groups; and a biocompatible material layer laminated on the substrate at an appropriate position, wherein the hydroxyl groups are formed on a surface of the substrate at least at a required position by a surface treatment, while the biocompatible material layer is formed from a polymer containing phosphorylcholine groups, and wherein the substrate and the biocompatible material layer are joined via a binder layer formed from silica being covalently bonded with the hydroxyl groups and the biocompatible material, respectively.

Abstract: The object of the present invention is to provide a sliding member, a prosthesis and a method of producing the sliding member, which can suppress production of abrasive wear debris by suppressing friction of the sliding section, and also can maintain satisfactory mechanical characteristics in vivo. A sliding member comprising: a substrate 1 capable of forming hydroxyl groups; and a biocompatible material layer 4 laminated on appropriate sections of the substrate 1, wherein hydroxyl groups are formed on at least a required section of a surface of the substrate 1 by surface treating to form a surface-treated layer 2, while the biocompatible material layer 4 is formed from a polymer containing phosphorylcholine groups, and wherein the substrate 1 and the biocompatible material layer 4 are joined via a binder layer 3 formed from silica being covalently bonded with the hydroxyl groups and the biocompatible material, respectively.

Abstract: In an artificial hip joint stem of the present invention, a distance between an inner wall portion and an outer wall portion is decreased as separating from an opening part in a sectional view that is parallel to a stem central axis and includes the inner wall portion and the outer wall portion, and both a front wall portion and a rear wall portion have a planar region in a sectional view that is parallel to the stem central axis and includes the front wall portion and the rear wall portion. A stem inserter of the present invention includes a disk-shaped front end part. The present invention also provides an artificial hip joint system including the artificial hip joint stem and the stem inserter, and an artificial hip joint including the artificial hip joint stem.

Abstract: An artificial hip joint includes a stem having a neck portion which has a truncated conical outer circumferential surface decreased in diameter toward a tip thereof; a head provided with a concavity in which the neck portion is inserted, an inner surface of the concavity including a truncated conical inner circumferential surface decreased in diameter toward an insertion direction of inserting the neck portion; and a sleeve inserted between the outer circumferential surface of the neck portion and the inner circumferential surface of the head. The sleeve has an inner circumferential portion which makes contact with the outer circumferential surface of the neck portion, and an outer circumferential portion which makes contact with the inner circumferential surface of the head, a starting end of the outer circumferential portion being located at a position retracting from an opening portion of the concavity in the insertion direction.

Abstract: In an artificial hip joint stem of the present invention, a distance between an inner wall portion and an outer wall portion is decreased as separating from an opening part in a sectional view that is parallel to a stem central axis and includes the inner wall portion and the outer wall portion, and both a front wall portion and a rear wall portion have a planar region in a sectional view that is parallel to the stem central axis and includes the front wall portion and the rear wall portion. A stem inserter of the present invention includes a disk-shaped front end part. The present invention also provides an artificial hip joint system including the artificial hip joint stem and the stem inserter, and an artificial hip joint including the artificial hip joint stem.