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《Chinese Journal of Trauma》 2004-12
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The stress distribution in the dome region of acetabulum after transverse acetabular fractures treated with different fixations

WANG Qing-xian, ZHANG Ying-ze, PAN Jin-she, LI Ya-zhou, XUE Jing, LIU Xiang-dong, SONG Zhao-hui. Emergency Trauma Center, Third Affiliated Hospital of Hebei Medical University, Shijiazhuang 050051, China  
Objective To compare the stress distribution in the dome region of acetabulum after different internal fixations for transverse acetabular fractures so as to evaluate the effectiveness of each fixation. Methods Five embalmed pelves including bilateral middle and upper parts of the femur from adult male corpse were harvested and divided into five groups, ie, intact pelvis group (Group I), anterior column plate group (Group A), posterior column plate group (Group B), anterior column plate and posterior column plate group (Group C) and anterior column lag screw plus posterior column plate group (Group D). Before loading, the entire capsule of the hip joint was removed so that the pressure-sensitive films could be fixed on the surface of the femoral head. The mean pressure and the peak pressure in the dome region of the acetabulum were measured with pressure translation system. Results The mean pressure and the peak pressure were (1.32±0.43) MPa and (2.17±0.20) MPa, respectively in the Group I, (2.73±0.68) MPa and (3.23±0.40) MPa, respectively in the Group A, (2.91± 0.65) MPa and (3.32±0.44) MPa, respectively in the Group B, (2.04±0.32) MPa and (2.72± 0.35) MPa, respectively in the Group C and (2.01±0.33) MPa and (2.69±0.33) MPa, respectively in the Group D. The least significant difference multiple comparison on the mean pressure and the peak pressure in five groups showed that there was significant difference in the Groups A, B, C and D compared with the Group I (P0.01, P0.01, P0.05 and P0.05, respectively). There was no significant difference between the Group A and the Group B (P0.05) as well as between the Group C and the Group D (P0.05). There was significant difference between Groups A, B and Groups C, D (P0.05). Conclusions For the transverse acetabular fractures, the mean pressure and the peak pres- sure in the dome region can not recover to normal even after anatomical reduction and internal fixation. Compared with the single column fixation, double column fixation can decrease the mean pressure and the peak pressure and is a better method for transverse acetabular fractures.
【CateGory Index】: R687
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