MOBILE VERSES FIXED BARING IN DEEP FLEXION AFTER TOTAL KNEE REPLACEMENT

Abstract

Introduction: Literature fails clearly to indicate an advantage of a mobile bearing over the fixed bearing implant. The purpose of this study is to compare result of mobile bearing verses fixed bearing Total Knee replacement done by single surgeon and to see if there is any advantage for the mobile bearing.

Material and Methods: Eight hundred sixty two cases of a mobile bearing LPS Flex implant was compared to four hundred twenty six cases of fix bearing LPS implant done from January of 2001 to January 2006, both group was performed by the same surgeon and the same postoperative cause was done in both group. Documentation for complication and knee score were done in both groups and statistics and analyses were curried out for this result. Also three kinematics evaluation was curried on for ten patients of each group to asset the tibia femoral movement in both groups in deep flexions.

Result: We had three Knee dislocations in the mobile bearing group none in the fixed bearing group the rest of the complication were similar in both group.

Average range of motion was the same in both groups.

Knee score was similar in both groups.

Canamathic assessment confirmed in both group excessive exteneraltation of the femur over the tibia and in fixed bearing group it confirms the spelling of the lateral femoral condoral from the tibial Plato which wrist concern about the safety Fix bearing in deep flexion.

Discussion and Conclusion: There was no clear advantage of Mobil bearing over fixed bearing implant, mobile bearing requires a better sophistical balance to reduce rate of Knee dislocation postoperatively. The mobile bearing knee seems to be more accommodating to deep flexion over Hundred & Fifty degrees and concern should be raised about the fixed bearing in deep flexion activity.