Kinematic analysis of a posterior cruciate retaining mobile-bearing total knee arthroplasty.
Using video fluoroscopy, 10 subjects having a mobile-bearing posterior cruciate-retaining total knee arthroplasty were analyzed to determine their in vivo kinematic patterns. Under weight-bearing conditions, while in extension, the average contact position was posterior to the mid-tibia sagittal plane with posterior translation of both condyles to 60 degrees of flexion, followed by anterior translation to 120 degrees of flexion. Under non-weight-bearing conditions, the average condylar contact positions were significantly more anterior from full extension to 90 degrees of knee flexion (P=.01). The average range of motion was 129 degrees under non-weight-bearing conditions and 119 degrees during weight-bearing. Although subjects in this study exhibited variable motion patterns, they are accommodated by the unconstrained optimized articulation of this highly conforming mobile-bearing implant.
Oakeshott
Roger
R
Sport Med SA, Adelaide, Australia.
Stiehl
James B
JB
Komistek
Richard A
RA
Anderson
Dylan T
DT
Haas
Brian D
BD
D001696:Biomechanical Phenomena; D006801:Humans; D007720:Knee Prosthesis; D011474:Prosthesis Design; D012399:Rotation