A computer-implemented method to improve the point collection process during registration of a bone for a computer-assisted surgical procedure is provided. Based on bone digitization data, a simulation is performed to confirm the accuracy of the registration for different digitization regions. Results are tested to identify which digitization regions meet a predefined accuracy requirement. The resulting information is used to perform a computer-assisted surgical procedure. A computerized simulation method for registration of a bone for a computer-assisted surgical procedure is also provided based on processor executing random stroking an expected exposed surface of a bone model with multiple of stroke curves to cover most of the bone model surface with uniform noise and a random sample consensus is applied to remove outlying point to yield the best registration results, to find the top subset as to overlap. A method to perform computer-assisted surgery is also provided.

A system determining a location for a surgical procedure, the system including a jig having a frame, a first marker fixed to the frame, wherein the first marker includes a scanable label, and a second marker moveably connected to the frame, such that the second marker can move positions independent of the frame, and wherein the second marker includes a scanable label. The system also includes a mixed reality headset configured to scan the scanable label of the first marker and the scanable label of the second marker, to provide location data to the mixed reality headset.

Provided is a Bone Cutting Guide (BCG) for facilitating the cutting of a patent's bones that may include an outer shell, comprising an upper shell; and a lower shell; a left guidance sphere, comprising a first plurality of pin guidance holes; and a first guide surface; a right guidance sphere, comprising a second plurality of pin guidance holes; and a second guide surface, wherein the left and right guidance spheres are positioned between the upper and lower shells; and a plurality of fasteners configured to hold the upper and lower shells together and, when tightened, secure the left guidance sphere and right guidance sphere into selected positions.

In accordance with one or more embodiments herein, a patellofemoral implant arrangement 200 for repairing damage in a patellofemoral articulation of a patient is provided. The patellofemoral implant arrangement 200 comprises a femoral trochlear implant 250, comprising an articulating surface 255, and a patellar implant 300, configured to be inserted, preferably with press-fit, into a recess 620 in a patella 600 in such a way that the perimeter of an articulating surface 310 of the patellar implant 300 does not extend beyond a surrounding articulating surface of the patella 600. The articulating surfaces 255, 310 of the femoral trochlear implant 250 and the patellar implant 300 are designed to allow that they at least partly interact with each other when the implants 250, 300 are implanted into the knee joint and the patella 600 lies in the intercondylar groove of the femur. Preferably, the articulating surface 255 of the femoral trochlear implant 250 is a metal or ceramic surface; and the articulating surface 310 of the patellar implant 300 is not a metal or ceramic surface. The articulating surface 310 of the patellar implant 300 may be designed to correspond to the curvature of a simulated healthy articulating surface of the undamaged patella 600 at the site of diseased cartilage. The contour curvature of the articulating surface 310 may be generated based on the determined surface curvature of the cartilage and/or the subchondral bone in a predetermined area comprising and surrounding the site of diseased cartilage and/or bone in the patella 600, to mimic the original, undamaged, articulating surface of the patella 600.

According to one example, an adjustable cut guide for resecting a bone can include a base, a cam, an actuator, and an insert. The base can include a channel extending between a first end and a second end and a slot intersecting the channel. The cam can extend into the slot, and the cam can be coupled to the base within the slot to rotate between a first position and a second position. The actuator can be disposed in the slot, where the actuator can be translatable by rotation of the cam between an extended position when the cam is in the first position and a retracted position when the cam is in the second position. The insert can be disposed within the channel of the base and the insert can be secured relative to the base by the actuator when the actuator is in the extended position.

A method of evaluating soft tissue of a human joint which includes two or more bones and ligaments, wherein the ligaments are under anatomical tension to connect the bones together, creating a load-bearing articulating joint, the method includes: inserting into the joint a tensioner-balancer that includes a means of controlling a distraction force; providing an electronic receiving device; moving the joint through at least a portion of its range of motion; while moving the joint, controlling the distraction force, and collecting displacement and distraction load data of the bones; processing the collected data to produce a digital geometric model of the joint, wherein the model includes: ligament displacement data along a range of flexion angles and ligament load data along a range of flexion angles; and storing the digital geometric model for further use.

An implant resection system for preparing an implant site to replace a defect in an articular surface of a first bone includes a first guide configured to be coupled generally to the first bone. The first guide includes a body portion defining a channel configured to receive a pin, wherein the pin is configured to penetrate and form a longitudinally disposed bore within the first bone. The implant resection system further includes a second guide configured to be coupled generally perpendicular to the first bone proximate to the defect by way of the bore. The second guide includes a drill bit configured to form an excision site through a portion of the articular surface in preparation of receipt of an implant.

A method and system are provided to assist in positioning the field-of-view (FOV) of an optical tracking system during a computer-assisted surgical procedure. The method includes displaying a view from a visible light detector on a display, and generating an outline as an overlay on the display of a FOV of two or more optical tracking detectors on the displayed view from the visible light detector. A user then positions at least one of: a) the two or more optical tracking detectors, or b) a tracked object based on the displayed view from the visible light detector and the generated outline.

A tibial tray system for a resurfaced proximal portion of a tibia for a knee replacement for a patient includes a tibial tray and at least one screw. The tibial tray includes a body having a superior portion, and an inferior tibia-engaging portion having a peripheral inferiorly-extending portion receivable in the at least one cavity formed in the periphery of the resected cancellous bone surface of the tibia of the patient. In some embodiments in the total knee replacement, a greater portion of a shearing force acting transversely on the tibial tray and the resected portion of the proximal portion of the tibia of the patient is resisted by the at least one inferiorly-extending wall compared to a portion of the shearing force being resisted along the center inferior surface of the tibial tray and the resected cancellous bone surface. The screw inhibits lift-off.

A surgical guidance system (SGS) for performing a cruciate pivot osteotomy in canines to treat cranial cruciate ligament disease. The SGS comprises a guide, a jig, and a plate. The guide is first placed over the tibia until it interacts with specific anatomical features of the tibia, thereby marking the proper position for the jig to be placed. After the jig has been secured, a blade defines an osteotomy within a proximal portion of the tibia. A portion of the jig is then cranially rotated providing a rotational correction of the proximal tibia. A compressive force is then applied to the osteotomy by the jig. Next the multiplane locking plate is placed over the osteotomy as dictated by the features of the jig. After initially securing the plate into its correct position, the jig is removed and the plate is then secured to the cranial surface of the tibia.