目的 探讨髁间窝宽度指数(NWI)在髁间嵴撕脱骨折与前交叉韧带(ACL)损伤中是否存在差异.方法 回顾性分析2014年6月至2018年5月期间南京大学医学院附属鼓楼医院运动医学与成人重建外科收治的10例胫骨髁间嵴撕脱骨折患者[男4例,女6例;年龄(32.7±9.2)岁],13例膝关节ACL损伤患者[男8例,女5例;年龄(31.8±10.9)岁]和22例单纯半月板损伤患者[男13例,女9例;年龄(30.9±10.6)岁],分别列为骨折组、ACL损伤组和对照组.所有患者术前均行膝关节MRI检查,在膝关节高分辨率MRI轴位扫描图像上测量髁间窝宽度、股骨双髁宽度及股骨双髁高度并计算NWI.比较3组间髁间窝宽度及NWI的差异.结果 骨折组、ACL损伤组及对照组患者间性别、年龄、身高、体重及BMI比较差异均无统计学意义(P＞0.05),具有可比性.ACL损伤组患者髁间窝宽度[(17.4±3.5)mm]明显小于骨折组[(20.8±1.1)mm]和对照组[(20.2±2.6)mm],差异有统计学意义(P＜0.05);骨折组和对照组相比差异无统计学意义(P＞ 0.05).骨折组的NWI(0.30±0.01)与对照组(0.28 ±0.04)相比差异无统计学意义(P＞0.05),但显著大于ACL损伤组(0.25±0.05),差异有统计学意义(P＜0.05);ACL损伤组NWI也明显小于对照组,差异有统计学意义(P＜0.05). 结论 髁间窝狭窄可能与ACL损伤而不与髁间嵴撕脱骨折有关;髁间嵴撕脱骨折和ACL损伤发病机制的不同可能和NWI有关.%Objective To find out if there is any difference in intercondylar fossa width and notch width index (NWI) between tibial intercondylar eminence avulsion fracture and anterior cruciate ligament (ACL) injury.Methods A retrospective study was conducted of the patients who had sought medical attention at Department of Sports Medicine and Adult Reconstructive Surgery,Drum Tower Hospital from June 2014 to May 2018.There were 10 patients with tibial intercondylar eminence avulsion fracture (4 males and 6 females with an average age of 32.7 ± 9.2 years),13 patients with ACL injury (8 males and 5 females with an average age of 31.8 ± 10.9 years) and 22 patients with simple meniscus injury as controls (13 males and 9 females with an average age of 30.9 ± 10.6 years).They all had MRI examination of the knee before surgery.The width of intercondylar fossa and the width and height of bilateral femoral condyles were measured on high resolution images of MRI axial view.NWI was calculated.The 3 groups were compared in intercondylar fossa width and NWI.Results The 3 groups of patients were comparable because there were no significant differences in gender,age,height,weight or BMI between them (P ＞ 0.05).The intercondylar fossa width in the ACL injury group (17.4 ± 3.5 mm) was significantly smaller than that in the avulsion fracture group (20.8 ± 1.1 mm) or in the control group (20.2 ±2.6 mm) (P ＜ 0.05),but no significant difference was detected between the avulsion fracture group and the control group (P ＞ 0.05).NWI in the avulsion fracture group (0.301 ±0.011) was similar to that in the control group (0.280 ±0.039) (P ＞ 0.05) but significantly higher than that in the ACL injury group (0.25 ± 0.05) (P ＜ 0.05).NWI in the ACL injury group was significantly lower than that in the control group (P ＜ 0.05).Conclusions Intercondylar notch stenosis may be a risk factor for ACL injury but may not be associated with tibial intercondylar eminence avulsion fracture.The difference in pathogenesis between tibial intercondylar eminence avulsion fracture and ACL injury may be associated with their difference in NWI.
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