Type of Submission
Poster
Keywords
Total knee replacements, abnormal gait, knee, stress, model, tibial insert, biomedical engineering, stress analysis
Abstract
One of the causes associated with total knee replacement (TKR) surgery is abnormal gait. In these gait cases, however, the TKR does not solve the ultimate issue because abnormal gait still occurs, and similar excessive forces still occur on the knee. It is likely that the TKR will experience accelerated wear, and the individual may have to undergo a second TKR sometime in the future. For our purposes, bowleggedness is either the external rotation of the hip or excessive varus of the knee. It was hypothesized that the inability to internally rotate the hip increases adduction moment and medial compartment stresses. In order to test this hypothesis, we created an analytical model to determine forces and moments at the knee. Results supported our hypothesis. In attempt to decrease the elevated stresses in the medial compartment, we created several models which modified the tibial plastic of the ADVANCE® Medial Pivot Knee. We performed stress analyses in ABAQUS and conducted experiments on each of the models. Based on our results we recommend the thickened anterior medial cusp implant for those with external rotation and the angled tray implant for those with varus deformity.
Faculty Sponsor or Advisor’s Name
Dr. Norman
Campus Venue
Stevens Student Center
Location
Cedarville, OH
Start Date
4-1-2015 11:00 AM
End Date
4-1-2015 2:00 PM
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Design of TKR Tibial Insert for Bowlegged Gait
Cedarville, OH
One of the causes associated with total knee replacement (TKR) surgery is abnormal gait. In these gait cases, however, the TKR does not solve the ultimate issue because abnormal gait still occurs, and similar excessive forces still occur on the knee. It is likely that the TKR will experience accelerated wear, and the individual may have to undergo a second TKR sometime in the future. For our purposes, bowleggedness is either the external rotation of the hip or excessive varus of the knee. It was hypothesized that the inability to internally rotate the hip increases adduction moment and medial compartment stresses. In order to test this hypothesis, we created an analytical model to determine forces and moments at the knee. Results supported our hypothesis. In attempt to decrease the elevated stresses in the medial compartment, we created several models which modified the tibial plastic of the ADVANCE® Medial Pivot Knee. We performed stress analyses in ABAQUS and conducted experiments on each of the models. Based on our results we recommend the thickened anterior medial cusp implant for those with external rotation and the angled tray implant for those with varus deformity.
