40 results about "Trochlear groove" 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 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 patient matched instrument for a patient's femur is disclosed. The instrument includes a body having a cutting slot and a patient matched surface that mates with the patient's trochlear groove, a first leg portion extending from the body, a second leg portion extending from the body; and each leg portion has a contacting pad for tangential contact with the patient's femoral medial and lateral condyles.

An apparatus for, and method of, diagnosing and treating patello-femoral misalignment, which includes an inward tracking member that operatively fits over, and provides direct inward pressure against, a patella; wherein the inward tracking member provides a compressive force against the patella, thereby increasing the contact surface area between the patellofemoral articular tissue and an associated femoral trochlear groove; is disclosed.

The present invention relates to systems and methods for preparing the trochlear groove of a patient's femur to receive a prosthesis thereon. In the system, a combination drill-and-alignment guide includes at least a proximal and intermediate section, and preferably also includes a distal section. Guide holes for receiving guide pins therein are located in the proximal and distal sections of the guide. After the guide is positioned using at least one of several visual and/or tactile references in the system, the guides pins are placed through the guide holes of the guide and into bone. The guide may then be removed and replaced by cannulated reamers that are rotated and used to resect a predetermined amount of bone around the guide pins. A prosthesis having at least a portion of an outer surface that substantially matches the trochlear groove of the patient in a pre-degenerated state is then implanted on the resected bone.

The present invention relates to systems and methods for preparing the trochlear groove of a patient's femur to receive a prosthesis thereon. In the system, a combination drill-and-alignment guide includes at least a proximal and intermediate section, and preferably also includes a distal section. Guide holes for receiving guide pins therein are located in the proximal and distal sections of the guide. After the guide is positioned using at least one of several visual and/or tactile references in the system, the guides pins are placed through the guide holes of the guide and into bone. The guide may then be removed and replaced by cannulated reamers that are rotated and used to resect a predetermined amount of bone around the guide pins. A prosthesis having at least a portion of an outer surface that substantially matches the trochlear groove of the patient in a pre-degenerated state is then implanted on the resected bone.

A system for replacing a trochlear groove region of a femur. The system includes a prosthesis that includes a bone contact surface and a periphery that defines an outer perimeter. The bone contact surface has a plurality of protrusions and a spatial configuration with respect to one another. Additionally, the system includes a first template that has a plurality of guide holes and a first periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. Also, included in the system is a second template that has a plurality of guide holes and a second periphery that defines an outer perimeter that substantially corresponds with the periphery of the prosthesis. The plurality of guide holes of the second template are spatially arranged with respect to the second periphery to substantially match the spatial configuration of the plurality of protrusions of the prosthesis.

An elongate flexible strap is adapted to be wrapped about a wearer's leg and pelvic region. The strap applies a torque to the leg, rotating the leg into a desired degree of external rotation. In a leg having an improperly aligned patella, it is believed that the external rotation improves lower extremity mechanics by aligning the patella within the trochlear groove.

The invention relates to a posterior cruciate ligament protection device for total knee replacement. The posterior cruciate ligament protection device is characterized by comprising a handle, wherein one end of the handle is fastened and connected with an auxiliary plate; the inner surface of the auxiliary plate is of an arc-shaped structure; one end, far away from the handle, of the auxiliary plate is fastened and connected with a fixed protection plate; the inner surface of the fixed protection plate is provided with a groove structure; and the end part, far away from the auxiliary plate, of the fixed protection plate is provided with a cutting edge. One end of the handle is fastened and connected with the auxiliary plate for covering a thighbone trochlear groove, and the fixed protection plate inserted into the tibial plateau sclerotin is fastened and connected into a position, far away from the handle, of the auxiliary plate, so that in the use process, the tibial plateau can be forwards pushed out relative to the thighbone by using the lever principle; and the convenience is brought to osteotomy. The inner surface of the fixed protection plate is provided with the groove structure, so that the posterior cruciate ligament and the posterior cruciate ligament bottom dead center can be covered and protected, and the posterior cruciate ligament tibial lateral bottom dead center avulsion fracture in and after the operation can be prevented.

A device for indicating the location of the anteroposterior femoral axis has a spike or needle that engages the anterior-most point in the intercondylar notch and a rounded or spherical surface is placed on the trochlear groove of the femur and urged in a posterior direction. That is, the rounded surface or ball is urged toward the bottom of the trochlear groove. This causes the rounded surface or ball to self-locate into the deepest point of the trochlear groove. The anterior-most point in the intercondylar notch and the deepest part of the trochlear groove anteriorly are points that accurately determine the anteroposterior femoral axis, and the device includes a marking device or guide member that is fixed perpendicular to this axis. A surgeon, therefore, has an accurate indication of the correct femoral component rotation for proper implant position in a knee replacement or other surgical procedure.

A trochlear groove prosthesis includes a base plate and cap. The base plate and cap are shaped to correspond to the shape of the trochlear groove. A cut is made in the femur to remove the worn or damaged trochlear groove. The base plate is attached to the cut portion of the femur. The cap is mated with the base plate. The prosthesis and procedure provide a properly shaped prosthesis with a single planar cut of the femur.

A method for replacing a joint surface, which includes resecting a first portion of the joint surface to create a wall surface and inner resected surface. The wall surface (2006) separates the inner resected surface and a non-resected portion of the joint surface. Further included in the method is cutting a concave groove having a first radius into the wall surface, and engaging the concave groove with a periphery of a joint prosthesis. The periphery includes a second radius that is substantially the same as the first radius of the concave groove.

The invention relates to an osteotomy device, which comprises an osteotomy plate, a fixing plate and an adjusting structure. The osteotomy plate is mounted on the femur through the fixing plate, and two ends of the adjusting structure are respectively connected with the fixing plate and the osteotomy plate. The osteotomy plate slides to the left and right by the adjustment structure relative to the fixing plate; and the osteotomy plate has a femur osteotomy groove for four-sided osteotomy and a femur trochlear osteotomy groove for the femur trochlear osteotomy. By using the osteotomy device, the femur trochlear osteotomy can be continued without replacing the osteotomy plate after the four-sided osteotomy operation, which effectively reduces the number of instruments, avoids repeated disassembly and assembly, and simplifies the operation steps; the osteotomy device can conveniently adjust the left and right sliding of the osteotomy plate relative to the fixing plate by using the adjustment structure, and then adjust the osteotomy plate to the femur trochlear groove facing to the femur trochlear. The osteotomy accuracy of the femur trochlear is increased, and the influence of the abnormal sliding trajectory of the kneecap after the restoration of the prosthesis due to the inaccurate osteotomy position of the femur trochlear can be avoided.

A femoral implant for articulation with a patella or a patellar implant includes a body having an articular surface defining a trochlear groove. The trochlear groove is defined by a first trochlear radius at a first location along the trochlear groove and by a second trochlear radius at a second location along the trochlear groove, the first radius being different than the second radius. The configuration of the trochlear groove is such that it narrows as a patella or patellar implant moves from an extension configuration to a flexion configuration. A kit includes the femoral implant along with a patellar implant. A method of trialing involves use of the femoral implant or kit to ensure a smooth transition of the patella or the patellar implant from the femoral component to the adjacent bone.

The invention discloses a posterior cruciate ligament protection device. The posterior cruciate ligament protection device comprises an elevator, an osteotome and a screw. The elevator comprises a handle, an auxiliary prizing plate and a prizing head. The handle, the auxiliary prizing plate and the prizing head are integrally formed, the handle is flat, one end of the handle is connected with theauxiliary prizing plate, the auxiliary prizing plate is of a flat arc-shaped structure and is matched with a trochlear groove, the prizing head is connected to the end, away from the handle, of the auxiliary prizing plate, a hole groove and a check table are further arranged at the end, close to the auxiliary prizing plate, of the handle, and the hole groove penetrates through the handle and the check table. An open groove is formed in a handle of the osteotome. The screw penetrates into the open groove of the osteotome and penetrates out of the hole groove in the handle of the elevator, and then the osteotome is screwed with the elevator. The posterior cruciate ligament protection device is simple in structure, convenient to use and low in manufacturing cost, the operation time is greatlyshortened, and the operation survival rate is increased.