Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (39): 7232-7236.doi: 10.3969/j.issn.2095-4344.2012.39.003

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Optimal entry points of screw in internal fixation of acetabular posterior column fracture with plate

Wang Xian-quan1, Zhou Wei2, Zhang Wei1, Wang Jian1, Xing Zi-ying3, Sun Cheng-liang1, Zhang Jin-lu1,Sun Shui1, Li Wei1   

  1. 1Department of Bone and Joint, Provincial Hospital Affiliated to Shandong University, Jinan 250021, Shandong Province, China
    2Red Cross First Aid Center of Zoucheng City, Zoucheng 273500, Shandong Province, China
    3Teaching and Research Section of Anatomy, Medical School of Shandong University, Jinan 250012, Shandong Province, China
  • Received:2012-01-04 Revised:2012-02-27 Online:2012-09-23 Published:2012-09-23
  • About author:Wang Xian-quan☆, M.D., Associate chief physician, Department of Bone and Joint, Provincial Hospital Affiliated to Shandong University, Jinan 250021, Shandong Province, China wxq72@126.com

Abstract:

BACKGROUND: Recently, open reduction and internal fixation has become a common therapy for pelvic and acetabular fractures. However, screw penetration sometimes damages important vessels or nerves in the pelvic cavity during the internal fixation.
OBJECTIVE: To investigate the optimal entry points, direction and length of screw in acetabular posterior column plate technique, and to prevent the serious complications caused by screw penetrating the joint surface.
METHODS: Twenty male cadaveric adult semipelvic specimens were taken and prepared into serial cross-sections of the acetabular posterior column. The safe angle of screw entry and the length on all entry points of each cross-section were measured. All data were input into software SPSS 10.0 for statistical process.
RESULTS AND CONCLUSION: On margin of acetabulum, lateral-middle 1/4 point, midpoint, medial-middle 1/4 point and medial margin of posterior column of each cross-section, safe entry angle of inclination was 39°, 57°, 74°, 90° and 106°respectively, the length of the screw was 39, 57, 74, 90 and 106 mm respectively. On lateral 1/4 region, lateral-middle 1/4 region, medial-middle 1/4 region and medial 1/4 region, screw posterior column angle was 40°-60°, 60°-75°, 75°-90°, 90°-parallel to the quadrilateral plate, and the length of the screw was 30 mm.

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