Center for Diagnostic and Interventional Radiology and Nuclear Medicine, Charité-University Medicine Berlin, Berlin, Germany.
Sporthopaedicum Berlin, Berlin, Germany.
Knee Surg Sports Traumatol Arthrosc. 2018 Sep;26(9):2697-2703. doi: 10.1007/s00167-017-4706-4. Epub 2017 Sep 9.
Notwithstanding the importance of the tibial slope (TS) for anterior tibial translation, little information is available regarding the implications on posterior laxity, particularly in healthy subjects. It was hypothesized that increased TS is associated with decreased posterior tibial translation (PTT) in healthy knees.
A total of 124 stress radiographs of healthy knees were enrolled in this study. Tibial slope and the posterior tibial translation were evaluated using a Telos device with a 150-N force at 90° of knee flexion. Two blinded observers reviewed independently on two different occasions.
One hundred and twenty-four patients [35 females and 89 males; 41 (range 18-75) years] were enrolled in this study, with a mean PTT of 2.8 mm (±1.9 mm; range 0-8 mm) and a mean TS of 8.6° (±2.6°; range 1°-14°). Pearson correlation showed a significant correlation between the PTT and TS in the overall patient cohort (P < 0.0001) with r = 0.76 and R = 0.58. There was no statistical difference between female and male patients regarding the PTT or the TS. Subgrouping of the patient cohort (four groups with n = 31) according to their TS (groups I < 7°; II = 7°-8.5°; III = 9°-10.5°; IV ≥ 11°) revealed significant differences between each subgroup, respectively. Furthermore, there was a weak but significant correlation between age and PTT (P = 0.004, r = 0.26).
In addition to the substantial variance in tibial slope and posterior laxity among healthy knees, high tibial slope significantly correlates with increased posterior tibial translation. Increasing age is further associated with a greater magnitude of posterior tibial translation. Consequently, knowledge of the tibial slope facilitates simple estimation of posterior knee laxity, which is mandatory for PCL reconstruction and knee arthroplasty.
尽管胫骨倾斜度（TS）对于胫骨前平移很重要，但关于其对后松弛度的影响的信息很少，特别是在健康受试者中。据推测，TS 增加与健康膝关节的胫骨后平移（PTT）减少有关。
本研究共纳入 124 例健康膝关节的应力射线照片。使用 Telos 设备在膝关节 90°屈曲位施加 150-N 力，评估胫骨斜率和胫骨后平移。两名盲法观察者在两个不同的时间点分别独立进行评估。
本研究共纳入 124 例患者[35 例女性和 89 例男性；41 岁（18-75 岁）]，平均 PTT 为 2.8mm（±1.9mm；0-8mm 范围），平均 TS 为 8.6°（±2.6°；1°-14°范围）。Pearson 相关性分析显示，整个患者队列的 PTT 与 TS 之间存在显著相关性（P<0.0001），相关系数 r=0.76，R2=0.58。女性和男性患者在 PTT 或 TS 方面无统计学差异。根据 TS 将患者队列分组（n=31 的四组）：I 组<7°；II 组=7°-8.5°；III 组=9°-10.5°；IV 组≥11°，分别显示各组之间存在显著差异。此外，年龄与 PTT 之间存在弱但显著的相关性（P=0.004，r=0.26）。
除了健康膝关节的胫骨斜率和后松弛度存在很大差异外，高胫骨斜率还与胫骨后平移增加显著相关。年龄的增加进一步与胫骨后平移的幅度增大相关。因此，对胫骨斜率的了解有助于简单估计后膝关节松弛度，这对于 PCL 重建和膝关节置换术是必需的。
