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Biomechanical research on anterior double-plate fixation for vertically unstable sacroiliac dislocations
Wu Chen1, Zhi-jun Pan, Jian-song Chen
1Department of Orthopaedics, Second Affiliated Hospital, Medical College of Zhejiang University, Hangzhou, China.
Objective:
To determine the best method for anterior internal fixation by comparing the biomechanical characteristics of various anterior fixation methods for vertically unstable sacroiliac dislocations.
Methods:
Eight pelves with Tile C fracture with vertical loading were measured separately. Three- and two-hole anterior double plates were fixed at different angles and compared with sacroiliac screws.
Results:
For two-hole anterior double plates, with increasing angle, axial stability increases while lateral stability decreases. For three-hole plates with an angle of 60°, axial stability is clearly better when placed horizontally, while lateral stability shows no obvious differences.
Conclusion:
For fixing sacroiliac dislocations, three-hole anterior double plates placed at about 60° produce excellent stability, which would be greatly increased if screws were added on the iliac side.
