Li Lan, Lu Jingwei, Yang Longfei, Zhang Kaijia, Jin Jing, Sun Guojing, Wang Xingsong, Jiang Qing
School of Mechanical Engineering, Southeast University, Nanjing 211189, China.
State Key Laboratory of Pharmaceutical Biotechnology, Department of Sports Medicine and Adult Reconstructive Surgery, Drum Tower Hospital Affiliated to Medical School of Nanjing University, Nanjing 210008, China.
Ann Transl Med. 2019 Jul;7(14):303. doi: 10.21037/atm.2019.05.65.
The pelvic ring fractures (PRF) are commonly induced by the high-energy impact and will lead to unstable and sever injures. This study is aimed to explore the stability of anterior external fixation in treating pelvis fracture and evaluate the possibility for these kinds of patients to reduce bedridden time.
A patient with Tile B3 pelvis fracture was chosen in the research and the corresponding digital model was reconstructed according to the CT images and 3D scanning. Four angles of pelvis under vertical compression were employed in the finite element (FE) analyses. The stress distribution and micro-motion displacement were calculated to validate the instability of pelvis.
The stress applied on the pelvis was ranged from 4.296 to 8.364 MPa in all postures. The stress applied on pins was less than 7.011 MPa during reclining, and reached 28.29 MPa when standing. The micro-motion displacement in reclining posture was ranged from 0.005 to 0.087 mm. The value increased to more than 1mm in standing posture.
It was safety for patients with pelvis fracture to sit vertical or recline on the bed during nursing or having treatment, but standing or walking will generate inappropriate micro-motion. The existence of external fixation can reduce the possibility of complications caused by long-term bedridden.
骨盆环骨折（PRF）通常由高能冲击引起，会导致不稳定和严重损伤。本研究旨在探讨前路外固定治疗骨盆骨折的稳定性，并评估这类患者减少卧床时间的可能性。
研究选取1例Tile B3型骨盆骨折患者，根据CT图像和三维扫描重建相应的数字模型。在有限元（FE）分析中采用骨盆在垂直压缩下的四个角度。计算应力分布和微动位移以验证骨盆的不稳定性。
在所有姿势下，施加在骨盆上的应力范围为4.296至8.364MPa。卧床时施加在钢针上的应力小于7.011MPa，站立时达到28.29MPa。卧床姿势下的微动位移范围为0.005至0.087mm。站立姿势下该值增加到超过1mm。
骨盆骨折患者在护理或治疗期间垂直坐立或卧床休息是安全的，但站立或行走会产生不适当的微动。外固定的存在可降低长期卧床引起并发症的可能性。
