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To reduce the impact of Day Ⅱ crescent pelvic fractures in pedestrian traffic injuries, finite element analysis is used to investigate the biomechanical influences of Day Ⅱ Crescent Fracture Dislocation of Pelvis (CFDP) with different fixation systems. Based on a human pelvic finite element model, the pelvic model with fracture and four different fixation systems for Day Ⅱ CFDP are constructed according to human anatomical theory. These fixation systems include: one sacroiliac screw combined with one iliac screw (S1+I1), two sacroiliac screws combined with two iliac screws (S2+I2), three reconstructive titanium plates (P3), and one S2AI screw combined with two iliac screws (S2AI1+ I2). The advantages and disadvantages for the different fixation systems are comprehensively evaluated by the overall stiffness and stress of the pelvic model, the difference on the stress of iliac bone and internal fixation, and the difference on the stress and displacement of the fracture line. It is found that the stiffness of pelvic model with P3 solution and S2AI1+ I2 solution is higher than that of the other two internal fixation systems. In addition, the stress distribution on the undamaged side predicted by the pelvic model with P3 is also closer to that predicted by the normal model without fracture. However, the highest stress values on the reconstructed plate and the posterior inferior iliac spine are also predicted by the pelvic model P3 fixation systems, because of the direct contact between the reconstructed plate and cortical bone. This direct contact is also not conducive to the healing of the fracture. The stress and displacement distribution on fracture line predicted by the pelvic model with S2AI1+ I2 are closer to that predicted by the normal model without fracture. For the treatment of Day Ⅱ CFDP, it is recommended to choose S2AI sacroiliac screw combined with 2 iliac screws for internal fixation, which can achieve a firm fixation effect without adding other internal fixation systems.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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