Mechanics Analysis of Patients Having a Sigma Mobile Bearing TKA
| Status: | Completed |
|---|---|
| Conditions: | Orthopedic |
| Therapuetic Areas: | Orthopedics / Podiatry |
| Healthy: | No |
| Age Range: | Any |
| Updated: | 2/4/2013 |
| Start Date: | April 2012 |
| End Date: | February 2013 |
| Contact: | Kendall Slutzsky |
| Email: | kslutzky@coloradojoint.com |
| Phone: | 720-524-1367 |
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.
Inclusion Criteria:
- At least six months post-operative
- Between 40-85 years of age
- Have a body weight of less than 250 lbs.
- Judged clinically successful with a AKS greater than 90
- Have the DePuy Sigma mobile bearing TKA
- Good-to-excellent post-operative passive flexion
- Must be willing to sign the IC and HIPAA forms.
Exclusion Criteria:
- Pregnant females
- Those not willing to sign the IC and HIPAA forms
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