University of Notre Dame, Notre Dame, Indiana, USA.
Department of Orthopaedic Surgery, University of Michigan, Ann Arbor, Michigan, USA.
Am J Sports Med. 2022 Jan;50(1):85-92. doi: 10.1177/03635465211057271. Epub 2021 Nov 30.
The lateral femoral condyle index (LFCI)-a recently developed measure of the sphericity of the lateral femoral condyle-was reported to be a risk factor for anterior cruciate ligament (ACL) injury. However, issues have been raised regarding how the index was measured and regarding the patient group and the knee in which it was measured.
To investigate the association between the LFCI and the risk of sustaining a primary, noncontact ACL injury, and to examine whether this association was moderated by the posterior-inferior-directed slope of the lateral tibial plateau.
Cross-sectional study; Level of evidence, 3.
A secondary analysis was conducted of deidentified magnetic resonance images of the uninjured knees of 86 athletes with ACL injury and the corresponding knees of 86 control athletes, matched for sports team, sex, and age. From those images, we measured the LFCI and the posterior-inferior-directed slope of the middle region articular cartilage surface of the tibial plateau's lateral compartment. Conditional logistic regressions were performed to determine whether the LFCI was significantly associated with ACL injury risk and whether the lateral tibial compartment middle cartilage slope moderated this association. Data were analyzed for female and male participants separately as well as for both groups combined.
The LFCI was not found to be significantly associated with experiencing a primary, noncontact ACL injury for all analyses. The lateral tibial slope measure was not found to moderate the association between the LFCI and ACL injury. A conditional logistic regression analysis using the LFCI data of the injured knees, instead of the uninjured knees, of the participants with ACL injury revealed that the LFCI was significantly associated with ACL injury.
In this population of athletically active female and male participants, the LFCI was not found to be a risk factor for noncontact ACL injury, regardless of the geometric features of the lateral tibial slope.
外侧股骨髁指数（LFCI）-最近开发的一种衡量外侧股骨髁球形度的指标-据报道是前交叉韧带（ACL）损伤的一个危险因素。然而，人们对该指数的测量方法以及患者群体和测量的膝关节提出了一些问题。
研究 LFCI 与初次非接触性 ACL 损伤风险之间的关联，并检查这种关联是否受外侧胫骨平台后下向斜率的调节。
横断面研究；证据水平，3 级。
对 86 名 ACL 损伤运动员的未受伤膝关节和 86 名相应对照运动员的未受伤膝关节的磁共振图像进行了二次分析，这些运动员按运动队、性别和年龄进行了匹配。从这些图像中，我们测量了 LFCI 和外侧胫骨平台间室中间区域软骨表面的后下向斜率。进行条件逻辑回归分析，以确定 LFCI 是否与 ACL 损伤风险显著相关，以及外侧胫骨间室中间软骨斜率是否调节这种关联。对女性和男性参与者分别以及两组合并进行了数据分析。
在所有分析中，LFCI 与经历初次非接触性 ACL 损伤均无显著相关性。未发现外侧胫骨斜率测量值调节 LFCI 与 ACL 损伤之间的关联。使用 ACL 损伤参与者受伤膝关节而不是未受伤膝关节的 LFCI 数据进行的条件逻辑回归分析显示，LFCI 与 ACL 损伤显著相关。
在这个有运动活跃的女性和男性参与者的人群中，无论外侧胫骨斜率的几何特征如何，LFCI 都不是非接触性 ACL 损伤的危险因素。
