Biomechanical Changes of Tramatized Medial Malleolus Defect Reconstruction

Objective To measure biomechanical changes of medial malleolus defect before and after reconstruction.Methods Twelve fresh freezing limb specimens were collected and experimentally tramatized to result in medial malleolus defect.Fibular head bone flap was applied to rebuild medial malleolus subsequently.Then the test groups were divided into three groups:the group of media malleolus defect(group A),the group of medial malleolus normality(group B),and the group of medial malleolus after reconstruction(group C).Results The change of loading-strain,rigid and strength under 1000 N showed significant difference between group A and group B(P0.05),however,no significant difference between group C and group B.The contact area of group A was respectively less than group B under 1000 N(P0.05).At the same time the contact pressure of group A was bigger than group B(P0.05).Conclusion The defect medial malleolus can lead to severe instability of ankle,and can recover its stability by the fibular head bone flap repairing.It is an effective operative method.