Biomechanical consequences of different step-off displacement and degree of acetabular fractures

doi:10.16098/j.issn.0529-1356.2015.06.013

Abstract

Abstract:

Objective To study biomechanical effect of different direction of the step-off caused by rotational displacement involving in the weight-bearing articular area of acetabular fracture, and to reveal the distribution and variation of stress and contact area. Methods Ten acetabular specimens were included in the study. The image information of the pressure-sensitive film after loading was scanned into the computer and analyzed by a contact pressure measurement software to calculate the area of contact. Intact（group I）, anatomical（group K）and different level of step-off (group A: 1mm; group B: 2mm; group C: 3mm; D group: 4mm; Group a:-1mm; group b:-2mm, group c: -3mm, group d: -4mm) acetabular frature were measured for contact characteristics between the acetabulum and femoral head. The data were analyzed by SPSS19.0 statistical analysis software. Results The contact area of intact acetabulum was （7.59±4.42）cm². Anatomical reduction group and group A generally had the normal structure of acetabulum and did not change the contact area significantly. The other groups caused significantly decrease of the contact area (P<0.05). The contact area of superior region in intact acetabulum was (3.72±0.04) cm², which was decreased after fracture. The pronation step-off reached 3mm or greater and supination step-off 3mm or more, superior region contact area significantly reduced. Conclusion Step-off displacement caused by acetabular fractures changes the biomechanical properties of normal hip joint and significantly alters the distribution the contact area.

Key words: Acetabulum, Articular surface, Step-off, Biomechanics, Applied anatomy, Human

DONG Yi-long*QIAN Yue-nan HUANG Xiang-xiang LIU Liang-le CAI Chun-yuan YANG Guo-jing. Biomechanical consequences of different step-off displacement and degree of acetabular fractures[J]. AAS, 2015, 46(6): 802-806.

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