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Bearing Capacity of a Modified U-shaped Plate

BACKGROUND: Authors’ previous studies showed that U-shaped plate could give continuously pressure to broken ends of fractured bone and make the fractured region in an optimal environment and promote union of fracture. 
OBJECTIVE: To discuss the loading ability of modified U-shaped plate. 
DESIGN, TIME AND SETTING: The single sample experiment was performed at the Laboratory of Materials Mechanics, Central South University from December 1990 to April 2001. 
MATERIALS: Plain bone plate is provided by Jiangsu Jinlu, China. AO plate and dynamic compression plate are purchased from MATHYS, Switzerland. U-shaped plate is a modified plate with a U-shaped arm in the middle of a common plate (Patent number 012497304). 
METHODS: We measured the mechanics of experimental mode to understand the compressing and distorting ability, to test theoretic calculation and to compare with common plate, AO plate and dynamic compression plate. 
MAIN OUTCOME MEASURES: Bending ability and distorting ability. 
RESULTS: Compared with the same usage of AO-Plate and dynamic compression plate at sagittal face, the bending ability of U-shaped plate could increase respectively by 107.5% and 21.5%, and the distorting ability increase respectively by 406% and 58%. Distorting ability increased by 31.9%, compared with limited contact dynamic compress plate (LC-DCP). 
CONCLUSION: Modified U-shaped plate is an eligible plate of enough strength and rigidity, compared with common AO plate and compress plate.