Abstract: This study investigated the changes of anatomical parameters of multi-slice spiral CT (MSCT) before and after surgery for femoroacetabular impingement (FAI) complicated with labral injury and its correlation with clinical symptom improvement and joint function. All 266 patients with FAI combined with glenoid labrum injury were selected for this study and underwent hip arthroscopic osteotomy combined with glenoid labrum repair, and were divided into excellent (n=228) and non-excellent (n=38) groups according to the outcome at 3 months after surgery. The general data, preoperative and 3-month postoperative central marginal angle (LCE), eccentric distance (Offset), femoral head prominence index (FEI), acetabular anterior-posterior margin angle (EE), α-angle and the difference of each MSCT parameter were compared between the two groups. Pearson’s analysis was applied to analyze the relationship between preoperative and 3-month postoperative LCE, Offset, FEI, EE, α-angle difference and modified Harris Hip Score (mHHS) and pain visual analog scoring method (VAS), and multiple linear regression equation was used to analyze the influencing factors related to surgical outcomes. The results showed that the LCE and α-angle were lower than those before surgery, and Offset, FEI and EE were higher than those before surgery in the excellent and non-excellent groups at 3 months after surgery (P<0.05). LCE and α-angle at 3 months after surgery were lower in the superior group than in the non-excellent group, and Offset, FEI, and EE were higher than in the non-excellent group (P<0.05). The absolute values of LCE, Offset, FEI, EE, and α-angle differences at 3 months postoperatively versus preoperatively were greater in the superior group than in the non-excellent group (P<0.05). The absolute values of LCE, Offset, FEI, EE, and alpha angle difference were positively correlated with mHHS scores and negatively correlated with VAS scores at 3 months postoperatively versus preoperatively (P<0.05). LCE, Offset, FEI, EE, and α-angle were significantly correlated with mHHS score at 3 months postoperatively (P<0.05). The changes in MSCT anatomical parameters before and after surgery for FAI combined with glenoid labral injury can reflect the degree of clinical symptom improvement and are related to joint function, and have application value in clinical treatment and assessment of patient prognosis.

Key words: femoral acetabular impingement, glenoid labral injury, multilayer spiral CT, joint function