3. 3.Under the slight wrist dorsal angulation of 10 degrees and forearm supination ,the vertical strain of dorsal and palmer surface were pulling strain and pressure strain respectively .

• 3．当腕关节轻度背伸，前臂旋后位时，骨折断面的掌、背侧中点所受应力分别为张应力和压应力，且随背伸角度的增加而增大。