Synvasive Technology, Inc.

Zimmer Gmbh

Andrew P Sizelove

Michael G Fisher

David Wycliffe Murray

Keith R Berend

Jody L Claypool

David G Lewallen

Stephen Edward White

Kenneth Dale Johannaber

Steven E Stump

Barjinder S Chana

Wayne Paprosky

Michael G Fischer

Stephen E White

Steven Stump

David Murray

Jody Claypool

David Lewallen

Systems, devices, and methods are provided for measuring forces in the space of a knee during surgery. Such forces can be caused by tension in the ligaments of the knee. A femoral member is engaged with a distal femur. While the knee is flexed, partially extended, or fully extended, a force sensor and a gauge shim can be placed in the gap between the femoral member and the tibial plateau to measure the forces therebetween. The force sensor provides an accurate and quantifiable measurement of force, making knee replacement surgery and ligament tension balancing more accurate, standardized and repeatable. The force sensor comprises an elongate housing which comprises a thin force sensing distal portion and a proximal handle portion.

Sensing force during partial or total knee replacement surgery

Sensing force during partial and total knee replacement surgery

Systems for determining force balance on a knee joint during a surgical procedure are disclosed. A system can include a tibial prosthesis. The tibial prosthesis can include a bearing component, a base component, and a shim component. The bearing component can have a superior articulating surface and an inferior surface. The bearing component can include a top portion, a bottom portion, a frame disposed between the top portion and the bottom portion, and a plurality of sensors disposed between the frame and the bottom portion. The frame can have a plurality of apertures corresponding in size or shape to the plurality of sensors. The base component can have a superior surface and an inferior surface. The shim component can be configured to be slidable between the inferior surface of the bearing component and the superior surface of the base component in an anterior to posterior direction.

Tibial prosthesis systems, kits, and methods

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Reno, NV, United States of America

Andrew P Sizelove