OBJECTIVE To propose a novel morphological classification method for notches, which may provide new evidence for notchplasty based on the three-dimensional (3D) features of notches and the risk of anterior cruciate ligament (ACL) injury. MATERIALS AND METHODS Three hundred individuals in total were included in our study, including 150 patients with ACL ruptures (75 males and 75 females) and 150 age- and gender-matched individuals without ACL ruptures. The notches were divided into four types according to the notch widths at the notch inlet, outlet, and ACL attachment based on the preoperative MRI, the notch volume was calculated, and the risk of ACL injury was compared. The surgical records were reviewed and whether these cases performed notchplasty were collected. RESULTS The inlet-and-outlet stenosis notch type was associated with smaller notch volume (P = 0.007) and a higher risk of ACL injury (P < 0.001). There were no significant differences in morphological distribution between males and females. The rate of notchplasty in inlet-and-outlet stenosis type was higher than the others. CONCLUSIONS The new morphological classification method efficiently reflected the association of the notch shape with the 3D notch volume and the risk of ACL injury. The knees with the inlet-and-outlet stenosis notch type and smaller notch volume tended to have a higher risk of ACL injury. Level of evidence Level III, case-control study.

中文翻译：

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一种基于MRI的股骨缺损形态学分类方法：一种简单有效的股骨缺损评估方法。

目的提出一种新型的切口形态学分类方法，为基于切口的三维（3D）特征和前交叉韧带（ACL）损伤的风险提供新的证据。材料与方法我们的研究共包括300例患者，包括150例ACL破裂的患者（男性75例，女性75例）和150例年龄和性别相匹配的无ACL破裂的患者。根据术前MRI，根据切口入口处，出口处的切口宽度和ACL附着处的切口宽度将切口分为四种类型，计算切口体积，并比较ACL损伤的风险。回顾了手术记录，并收集了这些病例是否进行了切口成形术。结果入口和出口狭窄的切口类型与较小的切口体积（P = 0.007）和较高的ACL损伤风险（P <0.001）相关。男女之间的形态分布没有显着差异。进出口狭窄型的切口成形率高于其他类型。结论新的形态学分类方法有效地反映了切口形状与3D切口体积的关联以及ACL损伤的风险。具有进出口狭窄切口类型和较小切口体积的膝盖往往具有较高的ACL损伤风险。证据等级III级，病例对照研究。进出口狭窄型的切口成形率较高。结论新的形态学分类方法有效地反映了切口形状与3D切口体积的关系以及ACL损伤的风险。带有入口和出口狭窄切口类型和较小切口体积的膝盖往往具有较高的ACL损伤风险。证据等级III级，病例对照研究。进出口狭窄型的切口成形率较高。结论新的形态学分类方法有效地反映了切口形状与3D切口体积的关联以及ACL损伤的风险。带有入口和出口狭窄切口类型和较小切口体积的膝盖往往具有较高的ACL损伤风险。证据等级III级，病例对照研究。