Abstract
PurposeTo analyze the contact mechanics of the femoral component and polyethylene of the Low Contact Stress rotating platform (LCS-RP) in nonweight bearing and weight bearing conditions using full flexion lateral radiographs.Materials and MethodsFrom May 2009 to December 2013, 58 knees in 41 patients diagnosed with osteoarthritis and treated with total knee arthroplasty (TKA) were included in this study. TKA was performed using an LCS-RP knee prosthesis. Full flexion lateral radiographs in both weight bearing and nonweight bearing condition were taken at least one month postoperatively (average, 28.8 months). Translation of femoral component was determined by the contact point between the femoral component and polyethylene. Maximum flexion was measured as the angle between the lines drawn at the midpoint of the femur and tibia.ResultsPosterior shift of the contact point in LCS-RP TKA was observed under weight bearing condition, which resulted in deeper flexion compared to LCS-RP TKA under nonweight bearing condition.ConclusionsIn the LCS-RP TKA, the contact point between the femoral component and polyethylene moved posteriorly under weight bearing condition, and the joint was more congruent and maximum flexion increased with weight bearing.
Highlights
Our hypothesis was that more prominent change of the contact mechanics would appear in the setting of weight bearing condition compared to nonweight bearing condition and this change would facilitate deeper flexion after Low Contact Stress rotating platform (LCS-RP) total knee arthroplasty (TKA)
58 knees in 41 patients diagnosed with osteoarthritis and treated with TKA were included in this study and Institutional Review Board approval was obtained
The postoperative maximum flexion measured in the out-patient clinic under the nonweight bearing condition and weight bearing condition was 108.4o±2.26o and 118.5o±4o, respectively
Summary
In a comparison of in vivo knee kinematic patterns. The purpose of this study was to analyze the contact mechanics of the femoral component and polyethylene of the mobile bearing TKA in nonweight bearing and weight bearing conditions using full flexion lateral radiographs. Our hypothesis was that more prominent change of the contact mechanics would appear in the setting of weight bearing condition compared to nonweight bearing condition and this change would facilitate deeper flexion after Low Contact Stress rotating platform (LCS-RP) TKA
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