Affiliation:
1. Department of Orthopedics, Second Affiliated Hospital, School of Medicine Zhejiang University Hangzhou China
2. Research Institute of Orthopedics Zhejiang University Hangzhou China
3. Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province Hangzhou City Zhejiang Province PR China
4. Clinical Research Center of Motor System Disease of Zhejiang Province Hangzhou Zhejiang Province PR China
Abstract
AbstractThe percutaneous sacroiliac (SI) screw is a common fixation option for posterior ring disruption in pelvic fractures. However, SI screw placement is difficult and can injure adjacent neurovascular structures. The sacral‐alar‐iliac screw (SAI) is a safe, reliable free‐hand sacral pelvic fixation technique. To investigate the biomechanical stability of SAI for SI joint dislocation, finite element analysis was performed in unstable Tile‐Type B and C pelvic ring injuries. The displacement in S1 (fixation of a unilateral S1 segment with one SI screw), TS1 (fixation of the S1 segment with a transsacra 1 screw), TS2 (fixation of the S2 segment with a transsacra 2 screw), S1AI, and S2AI exceeded the normal SI joint mobility. Sufficient stability after SI joint dislocation was obtained with (TS1 + TS2), (TS2 + S1), (S1AI + S2AI + rod), (S1AI + S2AI), and (S1 + S2AI + S1 pedicle) fixation. The TS1 + TS2 group had the smallest displacement and lowest peak screw stress, followed by (S1 + S2AI + S1 pedicle) placement. Our findings suggest that SAI screws are a valuable option for SI joint dislocation.
Subject
Orthopedics and Sports Medicine
Cited by
1 articles.
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