31 results about "Femoral condyles" patented technology

A replacement device for resurfacing a joint surface of a femur and a method of making and installing such a device is provided. The custom replacement device is designed to substantially fit the trochlear groove surface, of an individual femur. Thereby creating a "customized" replacement device for that individual femur and maintaining the original kinematics of the joint. The replacement device may be defined by four boundary points, and a first and a second surface. The first of four points is 3 to 5 mm from the point of attachment of the anterior cruciate ligament to the femur. The second point is near the bottom edge of the end of the natural articulatar cartilage. The third point is at the top ridge of the right condyle and the fourth point at the top ridge of the left condyle of the femur. The top surface is designed so as to maintain centrally directed tracking of the patella perpendicular to the plane established by the distal end of the femoral condyles and aligned with the center of the femoral head.

A knee prosthetic including a tibial component defining medial and lateral concavities shaped to receive medial and lateral femoral condyles of the femur. The concavities have first portions for contact with the condyles during normal knee flexion and second portions for contact with the condyles during deep, or high, knee flexion. The medial concavity can include a conforming boundary that encompasses at least the first and second portions, wherein an area inside the conforming boundary has a generally flat surface. The flat surface allows the medial femoral condyle to slide and rotate posteriorly during high knee flexion. The conforming boundary can have a generally triangular shape with an apex extending anteriorly and a relatively wider base extending posteriorly, wherein the apex includes the first portion and the base includes the second portion. The relatively wider base portion advantageously allows additional area for posteriorly directed articulating contact during high knee flexion.

According to the invention, the system enables a preoperative study to be carried out wherein the tibia and/or femur is modelled on a computer (6) in 3D, the ideal cutting plane is defined and the position of the resection instruments (1, 2, 3) used to cut the bone is modelled. Additionally, according to the invention, the system enables redefinition of the ideal cutting plane and the positioning and orientation of the resection instruments (1, 2, 3) on the tibia and/or femur, in such a manner that the plane of the slot (4) of the cutting guide (3) through which the cutting tool is introduced coincides with the ideal cutting plane.

A ligament and bone conserving prosthesis for total knee resurfacing includes a distal femoral component which resurfaces the weight bearing portions of both femoral condyles and the trochlear groove. The prosthesis also includes implants to independently resurface the medial and lateral tibial plateaus in an inset manner. Also disclosed are apparatus and methods for performing the total knee resurfacing utilizing a minimally invasive, bone and ligament conserving manner.

A tibial prosthetic implant includes a base or base plate with an offset tibial stem. The base includes an inferior surface adapted to abut a resected surface of a patient's tibia and forms a base for articulating surfaces adapted to articulate with the patient's femoral condyles. The longitudinal center axis of the tibial stem extends from the inferior surface of the base and is offset from a center of the base. The offset places the stem in position to extend into the central canal of the tibia so that it does not substantially interfere with the cortical bone when the inferior surface of the base substantially abuts and aligns with the resected surface of the tibia.

A femoral caliper having one or more anatomical referencing members for placement against portions of the femur, such as the anterior cortex and posterior portion of the femoral condyles, to measure the femur for sizing of the femoral component. A reference mark positioning guide of the femoral caliper is connected to the anatomical referencing member and is capable of guiding placement of a reference mark on the femur that facilitates positioning of the femoral component. The femoral caliper includes an adjustment mechanism capable of displacing the reference mark positioning guide relative to the anatomical referencing member. This allows adjustment of the position of the reference mark (and hence the femoral component) on the femur to account for the up or down sizing of the femoral component. Preferably, the adjustment mechanism adjusts the reference mark positioning guide in the anterior-posterior direction to allow balancing of the tightness or laxity of the selected component.

A specialized obturator that has a curved configuration designed specifically for entry through the anterior joint and out the back of the knee in the ideal position for a posterior portal. The curved obturator is shaped to avoid intact knee ligaments and femoral condyles. The obturator is provided with an eyelet located at the tip and may be employed with a cannula similar to a PassPort™ Button cannula, but with one or more sutures placed through the “neck” behind the collar. A standard “inside-out” cannula may be used as well, but dimensioned for the specialized obturator.

The distal end part of the retractor according to the invention is provided both with terminal tips for abutment on one of the femoral condylar walls which define therebetween the intercondylar space, and with a wing extending laterally in projection from this end part in order to form a frontal surface for thrust, in a medial-lateral direction, of that part of the quadriceps muscle tendon containing the patella when the tips are in abutment in the intercondylar space. By using this retractor as a lever, the wing efficiently reclines the patella, without turning it completely on itself, entirely exposing one of the femoral condyles. This invention is more particularly applicable to a surgical procedure for implanting a unicompartmental knee prosthesis.

A knee prosthesis includes a femoral component having two condyles and an asymmetrical cam extending between the condyles. The cam has a medial end and a lateral end. The knee prosthesis also includes a tibial component having bearing surfaces and a post disposed between the bearing surfaces. The femoral component and tibial component are engageable by contact between the femoral condyles and tibial bearing surfaces, and by contact between the cam and post. The cam includes a first curvature defined by a first plane passing through the cam, and a second curvature defined by a second plane passing through the cam, the first curvature having a first vertex, and the second curvature having a second vertex, the distance between the first vertex and a medial plane being greater than the distance between the second vertex and the medial plane.

A knee brace, method of use thereof, and modification to an existing knee brace facilitates inducing side loads to a knee joint to align upper and lower leg portions relative to one another, thereby allowing the knee joint to function properly over its full dynamic range of motion. The knee brace, whether as manufactured or modified, acts to apply a lateral shear force to the knee joint through application of opposing lateral forces, with one lateral force being above the knee joint in one direction and the other lateral force being below the knee joint in an opposite direction. The counteracting forces act to shift femoral condyles and tibial condyles of the knee joint back into proper lateral alignment without acting directly on the patella to counteract the effects of the patella femoral syndrome.

A method of generating a correction plan for a knee of a patient includes obtaining a ratio of reference bone density to reference ligament tension in a reference population. A bone of the knee of the patient may be imaged. From the image of the bone, a first dataset may be determined including at least one site of ligament attachment and existing dwell points of a medial femoral condyle and lateral femoral condyle of the patient on a tibia of the patient. Desired positions of contact in three dimensions of the femoral condyles of the patient with the tibia of the patient may be obtained by determining a relationship in which a ratio of bone density to ligament tension of the patient is substantially equal to the ratio of reference bone density to reference ligament tension.

The invention provides a tibial plateau. The tibial plateau includes a plateau seat, tibial pads, plateau adjusting parts installed between the plateau seat and the tibial pads and adjustable supportparts; each plateau adjusting part comprises an upper shell body and a lower shell body, the tibial pads are installed on the upper shell bodies, and the lower shell bodies are installed on the plateau seat; the adjustable support parts are used to adjust the distances between the upper shell bodies and the lower shell bodies, the adjustable support parts include temperature sense pieces and heating parts, the upper ends of the temperature sense pieces support the upper shell bodies, the lower ends of the temperature sense pieces are installed on the lower shell bodies, and the temperature sense pieces can adjust their own heights according to the temperature of the heating parts. When it is necessary to adjust the heights of the plateau adjustment parts, the heating parts can work to emitheat, the heights are increased after the temperature sense pieces are heated, so as to realize the rise of the tibial pads. In the process of using the knee joint prosthesis, when the unilateral wear is severe, the tibial plateau adjustment is used to keep the gaps between the inner and outer pads and the femoral condyles in an appropriate position to ensure the service life.

The present invention provides a femoral component and a single condyle prosthesis containing the femoral component. The femoral component is applied in a condyle joint prosthesis replacement and comprises a femoral support body and a connection component, the femoral support body is used for connecting a femur; the connection component is detachably arranged on the femoral support body to connectthe femoral support body with the femur; and wherein the connection component comprises a plurality of connectors, the plurality of the connectors are selectively arranged on the femoral support bodyto avoid defect locations on the femur and connect the femoral support body to the femur. The femoral component solves a problem that in the prior art, femoral components cannot be effectively fixedon defect femoral condyles.

The invention discloses a movable platform unicondylar replacement medullary cavity rod insertion 3D positioning guide plate and a manufacturing method thereof, which belong to the technical field ofmedical instruments. The movable platform unicondylar replacement medullary cavity rod insertion 3D positioning guide plate comprises a 3D upper surface, a plurality of guide plate fixing holes, an intramedullary positioning rod guide-in hole, an intramedullary positioning rod screw-in point corresponding to the intramedullary positioning rod guide-in hole is arranged between femoral condyles of the patient, and an included angle between the central axis of the intramedullary positioning rod guide-in hole and a femoral mechanical axis determined by CT scanning of the femur on the coronal position is 7 degrees. According to the 3D positioning guide plate and the manufacturing method thereof, the accuracy of femoral intramedullary positioning is improved, the accuracy of an operation is improved, and the service life of a prosthesis is prolonged.

An exemplary method, and corresponding instrumentation, of balancing the ligaments of a knee during flexion is disclosed. In one embodiment, the method includes forming initial resection cuts in a patient' femur and tibia, and subsequently placing the knee in flexion to form a flexion space between the posterior femoral condyles and the resected tibial surface. The method may further include sequentially inserting one or more flexion spacers into the flexion space, and selecting the flexion spacer that provides the ligaments with equal tension. The flexion spacers may include a medial platform and a lateral platform wherein, for at least one of the flexion spacers, the lateral platform has a greater thickness than the medial platform. The method may further include engaging an alignment sizing tool with the selected flexion spacer, forming a pair of pin holes in the femur, and mounting a cutting block to the femur using the pin holes.