Abstract:Objective〓To assess the clinical effectiveness of minimally invasive sacroiliac fixation in conjunction with internal fixation(INFIX) for the management of Tile B type pelvic fractures.Methods〓A retrospective study was undertaken involving 41 patients diagnosed with Tile B type pelvic fractures and treated at Zhongshan Hospital of Traditional Chinese Medicine between June 2021 and June 2023.These patients were randomly allocated into two groups:An observation group (n=20) receiving minimally invasive sacroiliac fixation combined with INFIX[male:13,female:7;age range:34~61 years,mean age:(47.1±8.1)years]and a control group (n=21) undergoing open reduction and internal fixation[male:15,female:6;age range:32~58 years,mean age:(45.8±7.6)years].Metrics including surgical duration,intraoperative blood loss,healing time,hospital stay duration,and visual analogue scale (VAS) pain scores were recorded and compared between the groups.Furthermore,fracture reduction quality was evaluated using the Matta score,and clinical functional outcomes were assessed with the Majeed score at the final follow-up.Additionally,the incidence of complications was compared across both groups.Results〓All patients were followed up for a period ranging from 6 to 18 months,with an average follow-up duration of (10.2±4.3)months.Key indicators,including surgical time,blood loss,and hospital stay,demonstrated the superiority of minimally invasive sacroiliac fixation combined with INFIX (P<0.001).No statistically significant difference was noted in fracture healing time between the two groups (P=0.536).Postoperative follow-ups revealed significant improvements in both VAS scores and Majeed scores compared to preoperative levels in both groups (P<0.05),with satisfactory fracture reduction outcomes achieved in both groups (P=0.879).Notably,the observation group exhibited a lower incidence of complications (5.0%) compared to the control group (19.0%),and this difference was statistically significant (P<0.05).Conclusion〓Minimally invasive sacroiliac fixation in conjunction with INFIX emerges as a safe and effective treatment modality for Tile B type pelvic fractures,presenting itself as a viable and favorable therapeutic option for managing such injuries.