Devices for setting thickness during total knee arthroplasty
OwnerJoseph B. ASSINI, Alexander P. SAHinventors
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Abstract
Described herein are mechanical, self-contained, non-implantable devices for setting polyethylene thickness during intra-operative trialing and balancing of a total knee arthroplasty. These adjustable trialing tibial insert apparatus may be used with a total knee arthroplasty (TKA) system in order to optimally set the thickness and/or other dimensions of the articular surface of the TKA. These adjustable trialing tibial insert apparatus may include a plurality of pre-set thickness settings, where the thickness is the thickness between a femoral articular surface and the tibial seating surface of the adjustable trialing tibial insert apparatus.
Claims23
An adjustable trialing tibial insert apparatus for setting articular surface thickness during a total knee arthroplasty (TKA) or revision procedure, the apparatus comprising:
- a femoral engagement plate having a femoral articular surface that is configured to engage with a femoral component of a TKA system;
- a tibial plate engagement frame having a tibial seating surface that is configured to engage with a tibial plate of the TKA system;
- a distraction selector cam having a cam surface, the cam surface a plurality of positions comprising a plurality of pre-set distraction thickness between the femoral articular surface and the tibial seating surface;
- and
- a distraction input selector coupled to the distraction selector cam and configured to be actuated to drive movement of the distraction selector cam against to change a distraction thickness between the femoral articular surface and the tibial seating surface.
An adjustable trialing tibial insert apparatus for setting articular surface thickness during a total knee arthroplasty (TKA) or revision procedure, the apparatus comprising:
- a femoral engagement plate having a femoral articular surface that is configured to engage with a femoral component of a TKA system;
- a tibial plate engagement frame having a tibial seating surface that is configured to engage with a tibial plate of the TKA system;
- a distraction selector cam having a cam surface, the distraction selector cam comprising a plurality of flattened sides on the cam surface each corresponding to a pre-set distraction thickness between the femoral articular surface and the tibial seating surface;
- one or more distraction selector cam follower surfaces configured to support the cam surface of the distraction selector cam;
- and
- a distraction input selector coupled to the distraction selector cam and configured to be actuated to drive movement of the distraction selector cam against the one or more distraction selector cam follower surfaces to change a distraction thickness between the femoral articular surface and the tibial seating surface;
- wherein the femoral engagement plate and the tibial plate engagement frame are coupled together via one or more telescoping supports configured to provide lateral support and prevent rocking at each of the preset distraction thicknesses corresponding to the plurality of flattened sides on the cam surface.
An adjustable trialing tibial insert apparatus for setting articular surface thickness during a total knee arthroplasty (TKA) or revision procedure, the apparatus comprising:
- a femoral engagement plate having a femoral articular surface that is configured to engage with a femoral component of a TKA system;
- a tibial plate engagement frame having a tibial seating surface that is configured to engage with a tibial plate of the TKA system;
- a distraction selector cam having a cam surface, the distraction selector cam comprising a plurality of flattened sides on the cam surface each corresponding to a pre-set distraction thickness between the femoral articular surface and the tibial seating surface;
- one or more distraction selector cam follower surfaces configured to support the cam surface of the distraction selector cam;
- a visualization window through an anterior region of the femoral engagement plate, wherein the visualization window is configured allow visualization of a distraction selector output indicator on the distraction selector cam indicating a current distraction thickness between the femoral articular surface and the tibial seating surface;
- a distraction input selector configured to be actuated to drive movement of the distraction selector cam to change the current distraction thickness between the femoral articular surface and the tibial seating surface,
- wherein the femoral engagement plate and the tibial plate engagement frame are coupled together via one or more telescoping supports configured to provide lateral support between the femoral articular surface and the tibial seating surface at each of the preset distraction thicknesses.
A method of determining an articular surface thickness for a total knee arthroplasty (TKA) or revision procedure using an adjustable trialing tibial insert apparatus, the method comprising:
- inserting an adjustable trialing tibial insert apparatus between a femoral component and tibial plate of a TKA system, wherein the adjustable trialing tibial insert is in a first thickness configuration;
- checking a response of the knee to a load and/or movement corresponding to the first thickness configuration;
- changing the thickness of the adjustable trialing tibial insert apparatus from the first thickness configuration to a second, pre-set, thickness configuration;
- checking a response of the knee to a second load and/or movement corresponding to the second, pre-set, thickness configuration;
- and
- removing the adjustable trialing tibial insert apparatus and selecting an articular surface to be positioned between the femoral component and tibial plate of the TKA system based on the responses of the knee to the load and/or movement.
Dependencies are inferred from the claim text.