摘要
为了防止或减轻坚硬接骨板固定后局部骨质疏松，我们在普通接骨板的螺孔与螺钉间加一粘弹性材料制成的垫圈，而形成可变刚度接骨板系统，本文通过体外模拟试验，分析其对循环压缩载荷的反应。结果发现：此系统承受１０￣５次压缩载荷后，固定刚度仍确实可靠。以后随着加载次数的继续增加，至２Ｘ１０￣５次后，其固定刚度逐渐下降，应力遮挡率明显降低，具有较好的临床相关性。分析其机理在于垫圈材料的疲劳破坏引起螺钉松动所致。
Plating of fractures results in osteoporosis beneath the plate because of the stress-shielding effect,so we designed a new plate system with a washer inserted between screw hole and screw. This study was performed to analysis the reaction of bone-plate system to cyclic vertical compressive loading.The in vitro experiment demonstrated that the new plate fixed to a osteotimized stimulant bone loosened due to fatigue damage of washer materials and thus decreased its stress-shielding rate with cyclically loaded l0 times. While the new plate-undrplate construct didn’t fail early with cyclically loaded 10 times before early fracture union culd occur. The investigation showed that the new plate system provided strong initial fixation and gradually loosened with cyclic loading in vitro and therefore should decrease the stress-shielding effect when applied in vivo.
出处
《医用生物力学》
CAS
CSCD
1996年第1期42-46,共5页
Journal of Medical Biomechanics
