Knee Prosthesis Clinical Trial
Official title:
In Vivo Mechanics Analysis of Patients Having a Sigma Mobile Bearing TKA
Utilize previously developed mathematical model to determine in vivo knee mechanics (kinematics, forces, stresses, areas and sound) for subjects having a Sigma Posterior Stabilizing (PS) mobile bearing (MB) total knee arthroplasty (TKA). There are several hypotheses for this study, although the most prominent is: Subjects having a Sigma RP PS TKA will experience polyethylene bearing rotation at 10 years post-operative, similar to their previous evaluations at six months, two years and five years.
Additional hypotheses:
- Subjects having a Sigma RP PS TKA will experience full ideal femorotibial contact
mechanics.
- Subjects having a Sigma RP PS TKA will experience optimal cam/post mechanics.
- Subjects having a Sigma RP PS TKA will experience continuous axial rotation in deep
flexion.
- Subjects having a Sigma RP PS TKA will experience optimal distribution of tibio-femoral
and cam/post contact forces over a broad area on the post.
- Subjects having a Sigma RP PS TKA will experience a smooth transition of the cam on the
post, not an abrupt slide as seen with fixed bearing PS TKA.
- The use of the sound sensors will detect cam/post contact mechanics under in vivo
conditions.
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