Device for measuring tibio-femoral force amplitudes and force locations in total knee arthroplasty
First Claim
Patent Images
1. A probe used during a total knee arthroplasty for measuring force amplitudes and force locations comprising:
- a first and second load sensitive plate, each for insertion into a joint-compartment of a knee joint and each having a top surface and a bottom surface,wherein each of the first and second load sensitive plates each include at least two load sensors, andwherein the first and second load sensitive plates have adjoining inner lateral side walls and are connected at the adjoining inner lateral side walls.
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Abstract
A probe used during a total knee arthroplasty for measuring forces and locations of their points of application and thereby moments includes two load sensitive plates t to be inserted in one joint-compartment of a knee joint each and each being provided with a top surface and a bottom surface. At least two load sensors may be situated on the top surfaces and/or the bottom surface of each load sensitive plate.
117 Citations
16 Claims
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1. A probe used during a total knee arthroplasty for measuring force amplitudes and force locations comprising:
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a first and second load sensitive plate, each for insertion into a joint-compartment of a knee joint and each having a top surface and a bottom surface, wherein each of the first and second load sensitive plates each include at least two load sensors, and wherein the first and second load sensitive plates have adjoining inner lateral side walls and are connected at the adjoining inner lateral side walls. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of using a probe during a total knee arthroplasty on a knee joint for measuring force amplitudes and force locations comprising the steps of:
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a. performing a tibial precut to obtain a flat reference surface and space for the probe, the probe comprising first and second load sensitive plates connected at adjoining lateral side walls and including at least two load sensors; b. inserting the probe into the knee joint; c. measuring in real time amplitude and location of compressive contact force as well as moments of each femoral condyle at various knee flexion angles; d. displaying the compressing contact forces and moments on a display; e. interpreting the compressing contact forces and moments based on a computational biomechanical model of the knee joint; f. correcting ligamentous balance according to the interpretation; g. repeating steps (c) through (f) until ligaments are balanced; and h. removing the probe and inserting prosthetic components.
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Specification