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  • Title: [Biomechanical evaluation of dynamic hip screw with bone cement augmentation in normal bone].
    Author: Li N, Peng A, Chai Y.
    Journal: Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi; 2007 Dec; 21(12):1299-301. PubMed ID: 18277669.
    Abstract:
    OBJECTIVE: To investigate the effects of augmentation with bone cement on the biomechanics of the dynamic hip screw (DHS) fixation in the intertrochanteric fracture specimen that has a normal bone density. METHODS: Twenty-four matched pairs of the embalmed male upper femora (48 sides) were used to make the specimens of the intertrochanteric fracture of Type A2. All the specimens were fixed with DHS. The right femur specimen from each pair was fixed by augmentation with DHS (the augmentation group) and the left femur specimen was fixed with the conventional fixation (the control group). The biomechanical tests on the bending stiffness and the torsional stiffness were performed with the servohydraulic testing machine in the two groups. RESULTS: The maximum load and the maximum torque were 3852.1602 +/- 143.6031 N and 15.5 +/- 2.6 Nm in the augmentation group and 3702.9667 +/- 133. 860 1 N and 14.7 +/- 3.4 Nm in the control group. There was no significant difference in the biomechanical effects between the two groups (P > 0.05). CONCLUSION: The augmenting fixation with bone cement in the intertrochanteric fracture specimen with a normal bone density has no significant effect on the strength of the DHS augmentation or on the overall stability of the fractured bone.
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