The Model And Internal Fixator Design Of The Schatzker Ⅵ Tibial Plateau Fractures With Posteromedial Condyle Spliting And Its Biomechanical Comparision Study

Objective Design a model of the Schatzkerâ…¥tibial plateau fractures with posteromedial condyle splitting and a new type of internal fixator, and perform a biomechanical comparative study to instruct the clinical applicationMethods 1.Eight knee specimens were made into models of SchatzkerVI tibial plateau fractures with posteromedial condyle splitting. 2.Slect the humerus far-end Y-shaped plates,and pre-bend into the shape for the tibial near-end medial condyle,wich has three holes each on the medialwing and the lateral wing.3.The specimens were divided into three group In accordance with the order before and after the grouping. group A were fixed with a lateral less invasive stabilization system(LISS), and group B with a lateral less invasive stabilization system(LISS) and a posteromedial Y-shaped plates, and group C were fixed with a lateral less invasive stabilization system(LISS) and a medial periarticular plate.Each model was tested for its biomechanical performance in resisting compression and displacementResults1. The displacement of fracture block from the anteromedial condyle when bearing the loads of 1000N:The biomechanical performance of group B and C were better than group A in load-displacement. there was significant difference between group A and group B, and significant difference between group A and group C.but no significant difference between group B and group C.2. The displacement of fracture block from the posteromedial condyle when bearing the loads of 1000N:The biomechanical performance of group B was better than that of group C in load-displacement, and The biomechanical performance of group C was better than that of group A in load-displacement, there was significant difference between group A and group B,and significant difference between group B and group C, as well as between group A and group C.3. The failure load of fracture block from the anteromedial condyle:The biomechanical performance of group B and C were better than that of group A, there was significant difference between group A and group B, and significant difference between group A and group C. but no significant difference between group B and group C.4. The failure load of fracture block from the posteromedial condyle:The biomechanical performance of group B was better than that of group C,and The biomechanical performance of group C was better than that of group A, there was significant difference between group A and group B,and significant difference between group B and group C. as well as between group A and group C.Conclusion 1.Firstly established the model of SchatzkerVI tibial plateau fractures with posteromedial condyle splitting.2.Designed a new type of posteromedial Y-shaped plates that applies to Schatzkerâ…¥tibial plateau fractures with posteromedial condyle splitting.3. The use of a lateral less invasive stabilization system(LISS) in combination with a self-designed posteromedial Y-shaped plates shows good biomechanical performance in fixing the Schatzkerâ…¥tibial plateau fractures with posteromedial condyle splitting.4. A medial periarticular plate is also needed in addition to a lateral less invasive stabilization system(LISS) in fixing the Schatzkerâ…¥tibial plateau fractures.