In Vivo Kinematics for Subjects Implanted With Klassic Total Knee Arthroplasty (TKA)

Study Overview
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Brief Summary
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In vivo knee kinematics will be assessed for 20 subjects that have been implanted with a Total Joint Orthopedics Klassic knee system by Dr. Aaron Hofmann of the Hofmann Arthritis Institute's Center for Precision Joint Replacement. This is the location from which all participants will be recruited and where fluoroscopy data collection will occur. Participants will undergo fluoroscopic surveillance of their implanted knee using a C-arm fluoroscopic unit while performing a deep knee bend activity at least six months post-operatively.

Detailed Description
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Enrollment will be increased to 24 subjects to ensure that researchers acquire the necessary 20 usable datasets for analysis and also to account for any subjects that may drop out of the study. At present, all TKA available for surgeons to use are asymmetric where there is a distinct femoral and tibial component for the left knee and a distinct femoral and tibial component for the right knee. The Klassic knee system is a symmetrical knee implant, where the same femoral and same tibial component can be used for either the right or left knee. The kinematics for the 20 knees will be analyzed, including condylar roll-back, axial rotation, range of motion, and condylar lift-off

Official Title
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In Vivo Kinematics for Subjects Implanted With Klassic TKA

Conditions
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Total Knee Arthroplasty, Osteo Arthritis Knee, Knee Implant, Knee Injuries

Intervention / Treatment
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* Device: Klassic Knee System


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects will have a Klassic knee system. Subjects must be at least six months post-operative. Participants must be judged clinically successful with their most recent (new) Knee Society Knee Score equal to or greater than 80. Participants must be able to perform a deep knee bend. Subjects must be willing to sign the Informed Consent (IC) / HIPAA form to participate in the study. Must speak English. Exclusion Criteria: Pregnant, potentially pregnant or lactating females. To satisfy radiation protocol, each female subject will be asked if she is pregnant, or possibly could be pregnant. A pregnant person will not be allowed to participate in the study. Subjects without the required type of knee implant. Bilateral subjects (i.e., patients with both knees implanted) Subjects who are unable to perform a deep knee bend. Subjects who are unwilling to sign Informed Consent/ HIPAA documents. Subjects who do not speak English

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Klassic TKA<br>Subjects implanted with a Klassic TKA. Subjects will undergo flouoroscopic evaluation during a deep knee bend evaluation and the postoperative kinematics will be reported. | Device: Klassic Knee System<br>* At present, all TKA available for surgeons to use are asymmetric where there is a distinct femoral and tibial component for the left knee and a distinct femoral and tibial component for the right knee. The Klassic knee system is a symmetrical knee implant, where the same femoral and same tibial component can be used for either the right or left knee<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Axial Rotation (AR) During Deep Knee Bend | Rotation of femoral component with respect to tibial component during deep knee bend. Positive indicated external rotation of femur wrt tibia. | at least 6 months post-operative | 
| Maximum Weight-bearing Flexion During Deep Knee Bend | Maximum weight-bearing flexion that the subjects are able to achieve during deep knee bend. All values are positive. | at least 6 months post-operative | 
| Medial Condyle Translations During Deep Knee Bend Activity. | Anterior Posterior (AP) translations of medial femoral condyle during deep knee bend. Positive indicates anterior sliding and negative indicates posterior rollback. | at least 6 months post-operative | 
| Lateral Condyle Translations During Deep Knee Bend Activity | Anterior Posterior (AP) translations of lateral femoral condyle during deep knee bend. Positive indicates anterior sliding and negative indicates posterior rollback. | at least 6 months post-operative | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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total knee arthroplasty, knee implant, osteoarthritis