Study on biomechanics of comminuted fracture of distal femur fixed by double plates

AIM：To develop a new internal fixaion device fo cominuted,unstable facures of he distal femur,and to offer a guide fo management of these injuries based on biomechanical sudies.METHODS:Ten fresh adult femurs of cadavers.All femurs were similarly made of the models of supracondylar-intercondylar fractures,then double-plating with a plate in comibination with a polythene-plate,and the conventional sigle-plating was served as the control.The biomechanic tests(Compression,bending,torsion)were performed.RESULTS:The bending and torsion tests demonstrated that the double-plating groups were much stronger(P&;lt;0.01) than the single-plating groups in anti-bending and anti-torsion.During the tests loading to failure,the double-plating groups failed at a mean peak load of 11540 Nin axial compression.700N in anterior bending 1082N in posterior bending,593 N in medial bending,1010N in lateral bending,CONCLUSION.Double-plating with a plate in combination with a polythene-plate is an excellent technique and design modification for severely comminuted fractures of the distal femur,which may provide a high stability and solidness so that early mobilization and weight-bearing are allowed.

Study on biomechanics of comminuted fracture of distal femur fixed by double plates