髋臼横断骨折两种内固定方式的生物力学研究

Biomechanical Study of Two Kinds of Transverse Acetabular Fracture Fixations

目的 对髋臼横断骨折两种常用的内固定方法进行生物力学比较。方法 取成年男性防腐骨盆标本 4个 ,制成半骨盆标本 8个 ,模拟髋臼横断骨折 ,随机分为二组 ,给予后柱单钢板及后柱双钢板内固定。通过传动杆与股骨头对髋臼进行连续垂直加载 ,直至内固定失败。结果 髋臼横断骨折后柱单钢板内固定及后柱双钢板内固定能承受的最大负载分别为 2 5 2 2 5±92 12N及 10 40± 143 0 6N。

Objective The purpose of this study was to evaluate the stability of two kinds of internal fixations requiring posterior surgical approach for the transverse acetabular fracture Methods Four embalmed pelves plus the proximal femora were harvested for this study Then eight hemipelves were made for testing Eight hemipelves were made to be transverse acetabular fractures by a saw and then divided into two groups randomly Internal fixation consisted of a single posterior column plate and double posterior column plates The force was applied through the femoral head which was adapted for attachment to a load cell The loads were increased in a continuous fashion until the internal fixation failed Results The maximal loads for the single posterior plate and double posterior plates were 252 25±92 12N and 1040±143 06N Conclusion The double posterior column plates provided more stability than the single posterior column Plate