Arthoplasty systems and methods for optimally aligning and tensioning a knee prosthesis
OwnerG. Lynn Rasmusseninventor
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Abstract
A combination of a first assembly for guiding resection of a femur and tibia of a knee joint and a second assembly including femoral and tibial knee components. The combination of the first assembly and the second assembly provides optimal placement and positioning of the femoral and tibial knee components to achieve near-normal knee kinematics and tension. The preparation for and placement of the prosthetic knee components provides medial-pivoting kinematics mimicking that of the natural knee thereby promoting improved outcome for the patient.
Claims17
An apparatus for adjusting at least one of:
- (i) tension and (ii) an alignment of a knee joint, the apparatus comprising:
- a first member configured to extend into a femur when the apparatus is seated in the knee joint;
- a second member that is configured to be seated at a proximal portion of a tibia when the apparatus is seated in the knee joint;
- and
- an adjustable component that is configured to couple the first member with the second member such that the second member is rotatable about a longitudinal axis of the first member when a position of the first member is constant with respect to the femur to allow for adjustment of an angle between the tibia and the femur when the apparatus is seated in the knee joint.
An apparatus for adjusting at least one of:
- (i) tension and (ii) an alignment of a knee joint, the apparatus comprising:
- an elongated member that is configured to extend into a distal end of a femur;
- a tibial contact member that is configured to contact a proximal end of a tibia;
- and
- an adjustable component that connects the elongated member with the tibial contact member such that the tibial contact member is rotatable about a longitudinal axis of the elongated member when the apparatus is seated in the knee joint, when the elongated member is fixed in position with respect to the femur, and when the knee joint is in a flexed position.
An apparatus for adjusting at least one of:
- (i) tension and (ii) an alignment of a knee joint, the apparatus comprising:
- a femoral element defining an opening, wherein a portion of the femoral element and the opening are configured to extend into a distal portion of a femur when the femoral element is seated in the knee joint;
- a elongated member that is configured to be received within the opening such that a portion of the elongated member extends into the femur when the femoral element is placed in the distal end of the femur and the elongated member is inserted into the femoral element;
- and
- a tibial contact member that is configured to contact a proximal end of a tibia when the apparatus is seated in the knee joint,
- wherein the elongated member and the tibial contact member are configured to couple together when the apparatus is seated in the knee joint such that the tibial contact member is rotatable with respect to the femur to allow for adjustment of an angle between the tibia and the femur when the apparatus is seated in the knee joint.
Dependencies are inferred from the claim text.