Abstract: The present application provides an apparatus arid method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first beatable element to a first bone on one side of a joint, providing a sensor having a second beatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first beatable element using a tracking device. The apparatus and method further includes selecting a generic model of a joint determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model, and outputting on a display the determined position upon the deformed model.

Abstract: The invention relates to a method for automatically determining, on a bone comprising a head portion contiguous to a neck portion, parameters for characterizing a bump deformation on the head-neck junction of the bone from acquired 3D medical image, the method comprising the following steps: i) constructing a 3D surface model of the bone; ii) fitting a sphere on the spherical portion of the head of the bone; iii) determining a neck axis characterizing the neck portion of the bone; iv) determining from the fitted sphere and the neck axis, a clock face referential on the head of the bone rotating around the neck axis; v) determining a 3D curve on the 3D surface model characterizing the head-neck junction of the bone; vi) determining, from the 3D curve, the summit of the bump deformation of the head-neck junction of the bone; vii) determining, from said summit of the bump deformation, first and a second parameters (?3D, iMax) characterizing the maximum bump deformation of the head-neck junction of the bone.

Abstract: The invention concerns a system for partially cutting a bone, comprising a device for guiding a cutting tool. According to the invention, the device comprises: an upper face forming a mechanical stop for a first part of the cutting tool, the upper face being non-cutting and thicker than the blade, so as to limit the insertion of the blade into said bone in order to partially cut said bone, the upper stop face having a profile that is a homothety of the edge profile of said hinge, the guide device having a pre-defined range to ensure the steering of the blade of the cutting tool in a pre-defined direction of partial cutting of the bone, a second part that fastens to the bone and a first fastening means for fastening the guide device to the second part and a means for adjusting the orientation of the guide device relative to the second part.

Abstract: The present invention relates to a device for adjusting the position of a surgical instrument (1) with respect to a solid (3) tracked by a navigation system (2), wherein the instrument (1) comprises a fixed part (11) that is rigidly fixed to the solid (3) and a mobile part (12) that is attached to the fixed part by screws (13), the device (4) comprising: a stem (41) comprising a tip (42) suited to the head (130) of the screws (13), a motorized system (45) for driving the stem (41) in rotation, a communication device with the navigation system (2), such that the navigation systems (2) transmits to the motorized system (45) the number of turns to apply to the stem (41) to reach the target position of each screw (13).

Abstract: The invention relates to a method for non-invasive reproducible determination of a corrected surface on a 3D bone surface model constructed from 3D medical image of a bone having a deformation consisting in a bump overgrowth at the head-neck junction; wherein said corrected surface comprises: i) a 3D spherical corrected surface patch on the head portion of said 3D bone surface model, and ii) a 3D smooth transition corrected surface patch on the neck portion of said 3D bone surface model, contiguous to said 3D spherical corrected surface patch; Said corrected surface patches are defined by a set of parameters comprising: iii) at least one first parameter (a*) representing a spherical extent value of said 3D spherical corrected surface patch, iv) and a set of at least one second parameter, said set determining the 3D correction boundary of said corrected surface patches, such that said corrected surface patches are continuous with said 3D bone surface model along said boundary.

Abstract: The invention relates to a surgical method of attachment of a first bony segment in relation with a second bony segment, both segments belonging to a same bone, which comprises the steps of: milling said bone and cutting it partially, to separate it in two bony segments linked together by a bony hinge distracting both bony segments around said hinge; fitting an osteotomy implant into the cavity thus obtained; attaching said implant to both bony segments; wherein it comprises the preoperative steps of: determining the position and the direction of the future partial cut, calculating its depth, calculating the relative three-dimensional positions of both bony segments to obtain the final desired alignment of the two bony segments, choosing among several osteotomy implants, one which is wider than the largest distance between the facing sides of said bony segments after distraction, determining the position and the shape of the future implant reception cavity and calculating its dimensions, deducing therefrom

Abstract: The invention relates to a method for real-time determination an optimal corrected surface of a first bone and/or a second bone forming together an articulation, the first and/or second bones presenting an overgrowth deformation, said corrected surface providing a greater range of motion of the articulation, the method comprising the following steps: i) constructing from acquired images of the articulation 3D voxel models of the first bone and the second bone; ii) for each of first and second bone voxel models, constructing a coordinate system defined by a center and three axes; iii) applying a motion pattern on the coordinate system of the second bone with respect to the coordinate system of the first bone, a motion pattern being a set of contiguous positions of the first or second bone coordinate systems with respect to the other bone coordinate system, the contiguous positions defining a movement of one bone with respect to the other, wherein said motion pattern is initially loaded from a data base of pred

Abstract: The present application provides an apparatus arid method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first beatable element to a first bone on one side of a joint, providing a sensor having a second beatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first beatable element using a tracking device. The apparatus and method further includes selecting a generic model of a joint determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model and outputting on a display the determined position, upon the deformed model.

Abstract: A computer-assisted orthopaedic surgery system includes a device for generating a three dimensional geometrical surface model of a first bone and a database containing three 3 dimensional implant models of a plurality of available implants. The system includes a computer that is configured to permit a user to select from the database a first implant and display on a screen the three dimensional implant model of the first implant. The computer superimposes on the screen the implant model on top of the model of the first bone such that the two models are visually identifiable from one another.

Abstract: The invention relates in particular to a system for attaching a first bone segment to a second bone segment, the two segments belonging to the same bone, in which the first and second segments are held together via a hinge resulting from the partial transverse cutting of said bone, characterised by the fact that said system comprises: two targets suitable for attaching to the two segments of said bone; a navigation system suitable for acquiring the three-dimensional positions and orientations of the targets;—a processing system suitable for calculating, based on the data sent from the navigation system, the angles corresponding to the three-dimensional alignment of said two segments; a display unit suitable for displaying the information to the surgeon; at least one milling guide; a plurality of implants of different sizes.

Abstract: The present application provides an apparatus and method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first locatable element to a first bone on one side of a joint, providing a sensor having a second locatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first locatable element using a tracking device. The apparatus and method further includes selecting a generic model of a joint, determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model, and outputting on a display the determined position upon the deformed model.

Abstract: The invention relates to a method for non-invasive reproducible determination of a corrected surface on a 3D bone surface model constructed from 3D medical image of a bone having a deformation consisting in a bump overgrowth at the head-neck junction; wherein said corrected surface comprises: i) a 3D spherical corrected surface patch on the head portion of said 3D bone surface model, and ii) a 3D smooth transition corrected surface patch on the neck portion of said 3D bone surface model, contiguous to said 3D spherical corrected surface patch; Said corrected surface patches are defined by a set of parameters comprising: iii) at least one first parameter (a*) representing a spherical extent value of said 3D spherical corrected surface patch, iv) and a set of at least one second parameter, said set determining the 3D correction boundary of said corrected surface patches, such that said corrected surface patches are continuous with said 3D bone surface model along said boundary.

Abstract: The present invention relates in particular to a method of alignment of a first bone, with a first and a second ends, in relation with a second bone, with a first and a second end, both bones being in a same limb, the first end of said first bone being a part of a distal joint for the first bone, the second end of said second bone being a part of a proximal joint for the second bone, said second end of the first bone and said first end of the second bone constituting a middle joint between both bones, wherein this first bone will be partially cut, in a transversal way, into two segments to form a hinge and wherein a tracker has been attached beforehand to each of two said bone segments.

Abstract: A computer-assisted orthopedic surgery system includes a device for generating a three dimensional geometrical surface model of a first bone and a database containing three 3 dimensional implant models of a plurality of available implants. The system includes a computer that is configured to permit a user to select from the database a first implant and display on a screen the three dimensional implant model of the first implant. The computer superimposes on the screen the implant model on top of the model of the first bone such that the two models are visually identifiable from one another.

Abstract: The invention concerns a device for adjusting the position of a screw (13) that is able to move a part of a surgical instrument, said device (4) comprising: —a stem (41) comprising a tip (42) suited to the head (130) of the screw (13), —an actuated system (45) for driving said stem (41) in rotation, —communication means to communicate with a control unit (21), such that the control unit (21) transmits to the actuated system (45) the number of turns to apply to the stem (41) to reach the target position of the screw (13).

Abstract: A method is provided for automatic identification of the contours of at least one portion of a predefined bone on the basis of a plurality of images representing parallel sections through a measurement volume including the portion of bone and which are obtained by a medical imaging technique. The method includes: a step of obtaining at least one shape of closed contour in at least one of the filtered images; a step of associating with each of the shapes a tag selected within a predefined bone-related nomenclature; a step of classifying the shapes so as to form at least one group of shapes delimiting a common volume isolated in space; a step of selecting the shapes of the group of target shapes.

Abstract: The invention relates to an automated method for precise determination of the head center and radius and the neck axis of an articulated bone from acquired 3D medical image of an articulation, comprising the following steps: i) determining, from a 3D image of the bone, an approximate sphere (SFO) of the head of the bone that substantially fits the spherical portion of the head of the bone; ii) constructing from the 3D image and the approximate sphere (SFO), a 3D surface model (S) of the bone; iii) determining, from the 3D surface model (S) and from the approximate sphere (SFO), an approximate neck axis (AXO) of the neck of the bone; iv) determining, from the 3D surface model (S) and the approximate sphere (SFO), a precise sphere (SF); v) determining, from the 3D surface model (S), the precise sphere (SF) and the approximate neck axis (AXO), a precise neck axis (AX1).

Abstract: The invention relates to a method for automatically determining, on a bone comprising a head portion contiguous to a neck portion, parameters for characterizing a bump deformation on the head-neck junction of the bone from acquired 3D medical image, the method comprising the following steps: i) constructing a 3D surface model of the bone; ii) fitting a sphere on the spherical portion of the head of the bone; iii) determining a neck axis characterizing the neck portion of the bone; iv) determining from the fitted sphere and the neck axis, a clock face referential on the head of the bone rotating around the neck axis; v) determining a 3D curve on the 3D surface model characterizing the head-neck junction of the bone; vi) determining, from the 3D curve, the summit of the bump deformation of the head-neck junction of the bone; vii) determining, from said summit of the bump deformation, first and a second parameters (?3D, iMax) characterizing the maximum bump deformation of the head-neck junction of the bone.

Abstract: The present application provides an apparatus and method for determining a position of a joint prosthesis using a computer assisted orthopedic surgery system in support of an arthroplasty surgery. The apparatus and method includes attaching a first locatable element to a first bone on one side of a joint, providing a sensor having a second locatable element and moving the sensor in proximity of the joint to locate a plurality of positions of the sensor relative to the first locatable element using a tracking device. The apparatus and method further includes selecting a generic model of a joint, determining the generic model in response to the plurality of positions located using the tracking device to generate a deformed model, determining a position for a joint prosthesis on the deformed model, and outputting on a display the determined position upon the deformed model.

Abstract: A computerized bone motion tracking system according to one exemplary embodiment is configured to: provide a non-invasive means for accurate measurement and tracking of the motion of a bone using a volumetric ultrasound transducer and a three dimensional position measurement system; provide relative measurements of one bone relative to another bone of a joint; decompose relative joint motion into specific components; and measure joint instability and range of motion.