A better understanding of knee joint kinematics is important to explain the premature polyethylene wear failures within total knee arthroplasties (TKAs) and to help design a prosthesis that most closely approximates the normal knee. Specifically, posterior stabilizing (PS) knees have been found to be associated with lower amounts of posterior femoral rollback, higher occurrence of reverse axial rotation and increased amount of condylar lift-off. The DePuy Synthes Joint Reconstruction's Attune PS fixed bearing (FB) knee system has incorporated subtle changes in its design to address restoration of kinematics that more closely resemble those of a normal knee. To understand if this design is able to effectively restore kinematics in the implanted knee, further in vivo analysis is necessary. This continuation of the study will analyze 30 subjects with the Attune PS FB 3 months post-operatively using the University of Tennessee's mobile fluoroscopy unit while performing three daily activities, level walking, ramp down and deep knee bend.
Study Type
OBSERVATIONAL
Enrollment
30
Individuals implanted with the DePuy Attune posterior stabilizing fixed bearing knee system at least three months post-operative.
OrthoCarolina Research Institute
Charlotte, North Carolina, United States
Abercrombie Radiology
Knoxville, Tennessee, United States
Dougherty Engineering Building, Room M007
Knoxville, Tennessee, United States
Perkins Hall, The University of Tennessee
Knoxville, Tennessee, United States
Science and Engineering Research Facility, The University of Tennessee
Knoxville, Tennessee, United States
Femoro-tibial Kinematics - Lateral Anterior/Posterior Motion
Amount of anterior sliding (positive) and/or posterior rollback (negative) of the lateral condyle during DKB, gait, and ramp down
Time frame: 3 months post-operative
Femoro-tibial Kinematics - Medial Anterior/Posterior Motion
Amount of anterior sliding (positive) and/or posterior rollback (negative) of the medial condyle during DKB, gait, and ramp down
Time frame: 3 months post-operative
Femoro-tibial Kinematics - Axial Rotation
Amount of axial rotation of the femoral component with respect to the tibial component during DKB, gait, and ramp down. Positive indicated external rotation of femur wrt tibia.
Time frame: 3 months post-operative
Femoro-tibial Kinematics - Weight-bearing Flexion
Amount of weight-bearing flexion during DKB, gait, and ramp down. All numbers are positive, indicating magnitude.
Time frame: 3 months post-operative
Max Ground Reaction Force - Deep Knee Bend
Collected simultaneously with fluoroscopy data, ground reaction forces were obtained using a force plate (fixed to the ground) while subject performed activity. Maximum force measured in the vertical direction measured during the activity was normalized with respect to participant's body weight and has been termed "maximum reaction force."
Time frame: 3 months post-operative
Max Ground Reaction Force - Gait
Collected simultaneously with fluoroscopy data, ground reaction forces were obtained using a force plate (fixed to the ground) while subject performed activity. Maximum force measured in the vertical direction measured during the activity. was normalized with respect to participant's body weight and has been termed "maximum reaction force."
Time frame: 3 months post-operative
Max Ground Reaction Force - Ramp Down
Collected simultaneously with fluoroscopy data, ground reaction forces were obtained using a force plate (fixed to the ground) while subject performed activity. Maximum force measured in the vertical direction measured during the activity. was normalized with respect to participant's body weight and has been termed "maximum reaction force."
Time frame: 3 months post-operative
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