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Mechanics Analysis of Patients Having a Sigma Mobile Bearing TKA — Sigma MB TKA  

Knee Prosthesis Clinical Trial

Official title:
In Vivo Mechanics Analysis of Patients Having a Sigma Mobile Bearing TKA

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

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