Analysis of Competitive Posterior Cruciate Retaining (PCR) and Posterior Stabilized (PS) Total Knee Arthroplasty (TKA)

Study Overview
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Brief Summary
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The purpose of the study is to acquire kinematic in vivo fluoroscopy data from subjects who were implanted with Stryker Posterior Cruciate Retaining (PCR) , Stryker Posterior Stabilized (PS), Zimmer PCR, and Zimmer PS Total Knee Arthroplasty (TKAs). Our lab has previously collected data for the Smith & Nephew PCR, bi-cruciate retaining (BCR), and bi-cruciate stabilized (BCS) TKA.

Detailed Description
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The objective for this study is to analyze the in vivo kinematics for subjects implanted with either a Stryker PCR, Stryker PS, Zimmer PCR, and Zimmer PS TKA and to compare those patterns to subjects having a normal knee from our previous study and to those patterns from subjects having a Smith & Nephew PCR, BCR, and BCS TKA.

Official Title
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Analysis of Competitive PCR and PS Total Knee Arthroplasty

Conditions
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Knee Osteoarthritis, Total Knee Arthroplasty, Knee

Intervention / Treatment
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* Device: Triathlon PCR TKA
* Device: Triathlon PS TKA
* Device: Persona PCR TKA
* Device: Persona PS TKA


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Subjects will have one of the following implant types: 1) Stryker Triathlon PCR TKA (28 subjects), 2) Stryker Triathlon PS TKA (28 subjects), 3) Zimmer Persona PCR TKA (28 subjects) and 4) Zimmer Persona PS TKA (28 subjects). Patients must be at least three months post-operative. Participants must not experience any pain or other post-operative complications. Participants must have a stable TKA and be capable of performing a deep knee bend activity. Participants must weigh less than 300 lbs., not underweight (BMI < 18.5) or too obese (BMI>35). Must be in the age range of 18 years to 85 years (both inclusive). Participants must be able to perform the required activities without concern. Subjects must be willing to sign the Informed Consent (IC) form to participate in the study. Patients who do not have previous surgery on the implanted knee that might restrict their movement. Exclusion Criteria: Pregnant, potentially pregnant, lactating females or of childbearing age. 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. (All potential female study patients will be asked if they are premenopausal or if they have undergone a hysterectomy. If the possibility of pregnancy exists, a pregnancy kit will be given to the patient at the informed consent meeting, just prior to the fluoro. Results of the test will be recorded in a test log. Any female patient showing a positive test will be excluded from testing.) Subjects without the required type of knee implant. Cannot have pain in other parts of the body that would prohibit the subject from performing the activities). Cannot have ligamentous pain and/or laxity. Unwilling to sign IC/HIPAA form(s). Does not speak English. Patients who have enrolled in a fluoroscopic kinematic study within the past year. Patients currently involved in any personal injury litigation, medical/legal or worker's compensation claims. Patients with known drug or alcohol abuse histories or psychological disorders that could affect ability to complete all aspects of the study. Patients with neurological or musculoskeletal disorders that might adversely affect weight-bearing motion ability.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 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 |
| --- | --- |
| Stryker Triathlon PCR TKA<br>Subjects implanted with a Stryker Triathlon PCR TKA | Device: Triathlon PCR TKA<br>* Total Knee Arthroplasty System<br>|
| Stryker Triathlon PS TKA<br>Subjects implanted with a Stryker Triathlon PS TKA | Device: Triathlon PS TKA<br>* Total Knee Arthroplasty System<br>|
| Zimmer Persona PCR TKA<br>Subjects implanted with a Zimmer Persona PCR TKA | Device: Persona PCR TKA<br>* Total Knee Arthroplasty System<br>|
| Zimmer Persona PS TKA<br>Subjects implanted with a Zimmer Persona PS TKA | Device: Persona PS TKA<br>* Total Knee Arthroplasty System<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Medial AP Translations, in mm, During Deep Knee Bend (DKB) Activity | Anterior Posterior (AP) translations, in mm, of medial femoral condyle during deep knee bend activity. Positive values indicate anterior motion of the medial femoral condyle, and negative values indicate posterior motion of the medial femoral condyle. | 3 months post-operative | 
| Lateral AP Translations, in mm, During Deep Knee Bend (DKB) Activity | Anterior Posterior (AP) translations, in mm, of lateral femoral condyle during deep knee bend activity. Positive values indicate anterior motion of the lateral femoral condyle, and negative values indicate posterior motion of the lateral femoral condyle. | 3 months post-operative | 
| Maximum Flexion, in Degrees, During Deep Knee Bend Activity | Maximum weight-bearing flexion, in degrees, during deep knee bend activity | 3 months post-operative | 
| Axial Rotation, in Degrees, During Deep Knee Bend Activity | Axial rotation (AR), in degrees, during deep knee bend activity. Positive values indicate external femorotibial axial rotation, and negative values indicate internal femorotibial axial rotation. | 3 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