A method of navigating a cutting instrument, via a computer system, the method comprising: (a) mounting a patient-specific anatomical mapper (PAM) to a human in a single known location and orientation, where the PAM includes a surface precisely and correctly mating with a human surface correctly in only a single location and orientation; (b) mounting a reference inertial measurement unit (IMU) to the human; (c) operatively coupling a guide to the PAM, where the guide includes an instrument inertial measurement unit (IMU) and at least one of a cutting slot and a pin orifice; (d) outputting data from the reference IMU and the instrument IMU indicative of changes in position and orientation of the guide with respect to the human; (e) repositioning the guide with respect to the human to a position and an orientation consistent with a plan for carrying out at least one of a cut and pin placement; and, (f) visually displaying feedback concerning the position and orientation of the guide with respect to the human using data output from the reference IMU and the instrument IMU, which data is processed by a computer program and the computer program directs the visually displayed feedback.

To stably maintain a fitting state to an opening portion by reducing a likelihood of displacement and detachment from the opening portion of a femoral trial. A cam module of the present disclosure includes a first connection portion disposed at a first end portion provided in a side wall portion and connectable to the femoral trial, and a second connection portion disposed at a second end portion provided in the side wall portion and connectable to the femoral trial.

A surgical implant includes a tray extending from a first end to a second end along a first plane, the tray including an upper surface and a lower surface, a first post coupled to and extending from the tray away from the first plane and configured to be inserted into a bone portion, the first post including a first opening extending through the first post, a second post coupled to and extending from the tray away from the first plane and configured to be implanted into the bone portion, the second post including a second opening extending through the second post, and a fastener removably coupled to the first post and the second post, the fastener extending from a first fastener end to a second fastener end through the first opening and the second opening.

A tibial spacer paddle comprises a spacer block comprising opposing bearing surfaces, an alignment slot extending into the spacer block; and a handle extending from the spacer block. The spacer block can include feet for passively engaging the femur or pegs for actively engaging a femoral component so that the spacer block is linked to the femur while the tibia rotates. A tibial spacer system comprises a provisional component having an alignment tab extending from a body and an alignment indicator located on the body, a femoral component and a pin extending from the femoral component. The pin can engage the alignment tab so that the provisional component is linked to the femur while the tibia rotates. In addition to or alternatively to the alignment tab and pin, the provisional component can include a tibial plate that can be rotationally connected to the provisional component.

A method for producing a sliding surface element on the basis of UHMWPE for a joint endoprosthesis includes mixing UHMWPE in powder form with 0.09 to 0.11% by weight of an antioxidant, compacting the UHMWPE mixed with the antioxidant into a molded body, manufacturing one or more sliding surface elements from the molded body by material-removing machining, and irradiating the sliding surface element by gamma radiation or X-ray radiation with a radiation dose of 25 to 45 kGy in order to crosslink the UHMWPE. The method can be practiced without thermal post-treatment of the irradiated sliding surface element.

A kit of parts for use in a unicondylar knee replacement procedure having a keel punch, a unicondylar tibial trial and an impactor. The keel punch including a cutting formation on the inferior side configured to form a slot in a resected part of a patient's tibia, and a first attachment formation on the superior side. The unicondylar tibial trial having a body defining a slot passing therethrough between an upper surface and a lower surface that extends parallel to a longitudinal axis extending from an anterior end to a posterior end of the body. The slot configured to slidably receive the keel punch. The impactor includes a second attachment formation and is releasably attachable to the keel punch by slidingly engaging the second attachment formation with the first attachment formation. An assembly for use in and methods of trialing during a unicondylar knee replacement procedure are also disclosed.

An orthopaedic knee prosthesis includes a tibial bearing and a femoral component configured to articulate with the tibial bearing. The femoral component includes a posterior cam configured to contact a spine of the tibial bearing and a condyle surface curved in the sagittal plane. The radius of curvature of the condyle surface decreases gradually between early-flexion and mid-flexion. Additionally, in some embodiments, the radius of curvature of the condyle surface may be increased during mid-flexion.

An orthopaedic knee prosthesis includes a femoral component having a condyle surface. The condyle surface is defined by one or more radii of curvatures, which are controlled to reduce or delay the onset of anterior translation of the femoral component relative to a tibial bearing.

A prosthetic device for use as an artificial meniscus is disclosed. The prosthetic device restores stress distribution, stability, and function to the knee joint after removal of the damaged natural meniscus. In some embodiments, the prosthetic device includes an anti-migration feature that inhibits extreme movement within the joint while permitting free floating over a significant range. In one aspect, the anti-migration feature is an enlarged anterior structure or a posterior meniscus remnant engaging channel while in another aspect, the anti-migration feature includes a tethering member. Still further, removable radiopaque features are provided to enhance trialing of the implant prior to final implantation within the joint.

The knee joint prosthesis includes a tibial component and a femoral component. The tibial component has a top surface, a bottom surface opposite to the top surface and a first slot passing through the top surface and the bottom surface for accommodating a cruciate ligament. The tibial component has at least one first protrusion disposed on the bottom surface, and the first protrusion has a plurality of first through holes. The femoral component is carried by the tibial component and has a second slot for accommodating the cruciate ligament. The femoral component has at least one second protrusion disposed on a surface thereof opposite to the tibial component, and the second protrusion has a plurality of second through holes. The first protrusion has a first rear and front portions, and a width of the first protrusion gradually becomes thicker from the first rear portion toward the first front portion.