Arrangement and method used in the preparation of bone surfaces of the knee joint for the components of a prosthetic knee joint
OwnerJonathan Peter Cabotinventor
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Abstract
An arrangement for minimizing the amount of bone initially required to be resected off surfaces of a knee joint prepared using a plurality of user-operable adjustable extension tabs that define a stability gap derived from gap measurements taken in each of extension, mid-flexion and flexion, wherein the stability gap is commensurate with a reference plane derivable from the arrangement wherein a final bone resection with a corresponding bone surface with said reference plane provides for optimum balanced angular movement between the tibia component and the femoral component of the prosthetic knee joint post-surgery.
Claims19
An arrangement for the preparation of the proximal surface of the tibia of a patient for a tibia component of a prosthetic knee joint, said arrangement including:
- a joint liner including:
- a body having an underside surface to face an initial resected tibia bone top surface, and an upper articulated surface to engage a femoral component of the prosthetic knee joint, and
- a plurality of user-operable height adjustable extension tabs each height adjustable relative to the underside surface of said joint liner to directly contact the initial resected tibia bone top surface, such that a height adjustment of said plurality of user-operable height adjustable extension tabs in each of extension, mid-flexion and flexion positions of the prosthetic knee joint orients the underside surface of the joint liner to define a tibia reference plane, wherein a final bone resection of the proximal surface of the tibia consistent with the orientation of said tibia reference plane provides for balanced angular movement between the tibia component and the femoral component of the prosthetic knee joint throughout an arc motion from the extension position, through mid-flexion position, to the flexion position of the prosthetic knee joint.
An arrangement the preparation of the proximal surface of the tibia of a patient for a tibia component of a prosthetic knee joint, said arrangement including:
- a joint liner including:
- a body having an underside surface, and an upper articulated surface to engage a femoral component of the prosthetic knee joint, and
- a plurality of user-operable height adjustable extension tabs each height adjustable relative to the underside surface of said joint liner to engage an initial resection surface of the prosthetic knee joint, such that a height adjustment of said plurality of user-operable height adjustable extension tabs in each of extension, mid-flexion and flexion positions of the prosthetic knee joint orients the underside surface of the joint liner to define a tibia reference plane, wherein a final bone resection of the proximal surface of the tibia consistent with the orientation of said tibia reference plane provides for balanced angular movement between the tibia component and the femoral component of the prosthetic knee joint throughout an arc motion from the extension position, through mid-flexion position, to the flexion position of the prosthetic knee joint, wherein each user-operable height adjustable extension tab is telescopically extendable and retractable to and from the underside surface of the joint liner or from within corresponding slots located on the bottom side of the underside surface of the joint liner.
Dependencies are inferred from the claim text.