Chinese Journal of Clinical Anatomy >
The anatomic study of percutaneous lag screw fixation for anterior column fracture in acetabulum in virtual three-dimensional reconstruction model
Received date: 2014-04-02
Online published: 2015-04-21
Objective To assess the risk of lag screw fixation for anterior column by measuring the applied anatomy parameters of the acetabular anterior column. Methods CT scan data of 155 (91 males and 64 females) cases of adult pelvis were obtained and virtual three-dimensional model were reconstructed by software MIMICS. Virtual screws were placed in the anterior column of the acetabulum，then the maximum diameter, length, entrance point of the screws were measured and the direction of the screws were calculated. The virtual cuts was made perpendicular to anterior surface of acetabulum , then the inner-outer and vertical diameter of anterior column was measured respectively. The arc of the anterior column of acetabulum in the edge of true pelvic was calculated. Results In the men, the maximum diameter and length of virtual screws were (7.95±0.98) mm and (124.84±6.79) mm, In the women, the values were (6.42±1.15) mm and (120.00±7.52) mm. In the men, The angles between screws and horizontal plane (the screw pointed caput), sagittal plane(the screw pointed outside) were (21.55±2.67)° and (42.15±2.54)°; In the women, the values were (21.85±5.10)° and (41.51±5.23)°. In the men, The arc of the segment MN of anterior column was (38.29±3.28)°, which was (43.41±3.50)° in the women. All data presented statistical significance between men and women except the direction of virtual screws. There was linear correlation between screws diameter and gender, the arc of the anterior column, and the correlation coefficients were -0.468 and -0.164, respectively. The risks of the female received anterior column fixation by screws6.5mm and 7.0mm in length were 9.081 and 13.316 times greater than the male, respectively. Conclusions The lag screw of 6.5 mm in diameter is strongly recommended for fixating the anterior column fracture of the acetabulum in Chinese people. For female, when the arc of the acetabular anterior column is more than (44.49±2.47)°, plate fixation should be considered.
ZHOU Hua , GAO Shi-Chang , ZHOU Cheng-Feng , SHI Li-Han . The anatomic study of percutaneous lag screw fixation for anterior column fracture in acetabulum in virtual three-dimensional reconstruction model[J]. Chinese Journal of Clinical Anatomy, 2015 , 33(2) : 148 -154 . DOI: 10.13418/j.issn.1001-165x.2015
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