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Clinical Trial Summary

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.


Clinical Trial Description

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. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT01714492
Study type Observational
Source The University of Tennessee, Knoxville
Contact
Status Completed
Phase
Start date April 2012
Completion date November 2012

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