Biomechanical Comparison of Knee Implant Designs During Sit-to-Stand
Author Information
Author(s): Wang He, Simpson Kathy J, Chamnongkich Samatchai, Kinsey Tracy, Mahoney Ormonde M
Primary Institution: Ball State University, University of Georgia, Chiang Mai University, Athens Orthopedic Clinic
Hypothesis
Do MR compared to SR limbs display kinetic differences to accomplish the STS movement or does the MR limb require greater levels of knee extensor activation to create the necessary knee joint moments?
Conclusion
The SR compared to MR limbs displayed greater AP GRF and AP ground reaction impulse with less VL activation during the sit-to-stand.
Supporting Evidence
- The SR limb had 10 N more peak AP GRF than the MR limb.
- The SR limb also had greater AP ground reaction impulse during the forward-thrust phase.
- No significant differences were displayed for the peak knee extensor moment between the SR and MR limbs.
- Six out of eight participants displayed greater ST activity of the MR limb than the SR limb.
Takeaway
This study looked at how different knee implant designs affect the way people stand up from a sitting position. It found that one design helped people use less muscle effort to stand up.
Methodology
The study analyzed kinematics, kinetics, and EMG data from eight bilateral TKA patients using both SR and MR implants during the sit-to-stand movement.
Potential Biases
Potential bias due to the different post-operative times for SR and MR limbs.
Limitations
The small sample size limited statistical power, and different types of MR TKA were used, which may influence results.
Participant Demographics
Participants were well-functioning bilateral TKA patients with a mean age of 72.4 years.
Statistical Information
P-Value
0.007
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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