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目的：采用生物力学法对粉碎性骨折、横断性骨折及短斜性骨折三种不同类型中内固定肱骨骨折钢板手术后稳定性进行深讨。方法：选取肱骨骨干标本24个，随机分为3组，分别标记为粉碎性骨折组、横断性骨折组及短斜性骨折组，在选取标本时注意控制其骨密度值的近似程度。采用生物力学仪测定标本垂直时外旋转角值及水平时外翻位移值。结果：三组外转角值及外翻位移值大小次序为：横断性骨折组<短斜性骨折组<粉碎性骨折组，且各组之间测量值存在统计学意义（P<0.05）。结论：采用钢板内固定肱骨骨折时，不同类型肱骨骨折的固定后的稳定性有差异，其中粉碎性骨折通过内固定后稳定性最差，短斜性骨折次之，横断性骨折最好。因此，遇到粉碎性骨折除进行钢板内固定外，术后还应进行适度的功能锻炼，必要时采用适当的外固定加以辅助。“,”ObjectiveTo analyze the stability after internal fixation for transverse fracture, short oblique fracture and comminuted fractures by biomechanical experiment.Methods24 specimens of humerus shaft with similar bone density were selected to make the models of transverse fracture, short oblique fracture and comminuted fracture. The humerus force-eversion displacement was recorded while the specimen was imposed vertically by the machine. The humeral torque-external rotation angle was recorded while the humerus was externally rotated on the machine.ResultsThe eversion displacement and external rotation angle increased gradually for the transverse fractures, short oblique fractures comminuted fractures in turn, and there was statistically different among three groups (P <0.05. ConclusionThe internal fixation stability for transverse fracture, short oblique fractures and comminuted fracture decreases gradually. The postoperative functional exercise should be proper for comminuted fractures, and can be supplemented by the appropriate external fixation if necessary.