TiRobot-assisted modified sacroiliac screw combined with LC-II screw for dislocation of Day type II crescent fracture of the pelvis

Abstract

Abstract Purpose To explore the clinical effect of modified sacroiliac screw and provide a new idea for the clinical treatment of Day type II crescent fracture of the pelvis. Methods We retrospectively analysed 42 patients undergoing surgical treatment for Day type II crescent fracture-dislocation from January 2020 to January 2023. TiRobot-assisted modified sacroiliac screws combined with LC-II screws was performed in 21 patients, and TiRobot-assisted traditional sacroiliac screws combined with LC-II screws was performed in other 21 patients. The patient characteristics, fracture classification, lengths of the iliac and sacral segments of the sacroiliac screws, distances between the sacroiliac screw entry point and the iliac fracture line, reduction quality, postoperative complications, and clinical outcomes were compared. Results There were no statistically significant differences between the two groups in terms of gender, age, cause of injury, fracture classification, time from injury to surgery, or intraoperative blood loss (P > 0.05). The average length of the iliac segment of sacroiliac screws in Group A was 3.71 ± 0.85 cm, which was longer than that in the control group (2.12 ± 0.47 cm, P < 0.01). The average length of the sacral segment for the sacroiliac screws in Group A and Group B was 5.65 ± 0.79 cm and 6.09 ± 0.70 cm, respectively, with no statistically significant difference (P = 0.066). The average distance between the sacroiliac screw entry point and the iliac fracture line in Group A was 3.31 ± 0.88 cm, which was longer than that in the control group (1.22 ± 0.64 cm, P < 0.01). The reduction quality in Group A was better than that in Group B (P < 0.05). There was no statistically significant difference in the Majeed score and incidence of postoperative complications at the final follow-up between the two groups. Conclusion TiRobot-assisted modified sacroiliac screws combined with LC-II screws is safe and effective in the treatment of Day type II crescent fracture-dislocations of the pelvis, it is worthwhile to be promoted in clinical treatment.