Establishment of acetabular anterior wall fracture model and comparison of biomechanical stability of different internal fixation methods
XU Bo-wen, ZHANG Qing-song, AN Si-qi, PEI Bao-rui, LI Hao, DAI Shi-long, WU Xiao-bo
Chinese Journal of Clinical Anatomy ›› 2017, Vol. 35 ›› Issue (4) : 425-430.
Establishment of acetabular anterior wall fracture model and comparison of biomechanical stability of different internal fixation methods
Objective To establish the acetabular anterior wall fracture model and compare the biomechanical stability of 4 kinds of internal fixation methods. Methods 20 fresh adult half pelvis specimens were selected to establish the acetabular anterior wall fracture model. The fracture models were randomly divided into 4 groups. Models in group A was fixed with a reconstruction plate along the upper margin of the pelvis, in group B was fixed with a reconstruction plate along the inner margin of the pelvis, and in group C was fixed with an antegrade lag screw, and in group D was fixed with a retrograde lag screw. The axial compression experiments were performed to measure the horizontal displacement of the fracture end in each group, and the shear rigidity was calculated. The biomechanical stability of the 4 groups was compared. Results Under the same load, the horizontal displacement of the fracture end: group A >group B >group C>group D; the internal fixation shear rigidity: group D>group C>group B>group A. There was no significant difference between the 4 groups in the horizontal displacement and the shear rigidity of internal fixation when the load was 400 N (P>0.05). When the load was 800 N to 2000 N, there was no significant difference between group C and group D in the horizontal displacement and the shear rigidity of internal fixation (P>0.05), and there was significant difference between the other groups (P<0.05). Conclusions The acetabular anterior wall fracture model established in this study can be used for biomechanical analysis of acetabular anterior wall fracture. The stability of lag screw fixation was higher than that of reconstruction plate fixation, and the stability of antegrade lag screw fixation was similar to that of retrograde lag screw fixation.
Acetabular anterior wall fracture / Fracture model / Internal fixation / Biomechanics
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