Patellar Tendon Orientation and Strain Are Predictors of ACL Strain In Vivo During a Single-Leg Jump.
Patellar Tendon Orientation and Strain Are Predictors of ACL Strain In Vivo During a Single-Leg Jump.
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DOI：
10.1177/2325967121991054
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发表时间：
2021-03
影响因子：
2.6
通讯作者：
DeFrate LE
中科院分区：
文献类型：
--
作者：
Englander ZA;Lau BC;Wittstein JR;Goode AP;DeFrate LE
在动态活动过程中，描述髌腱方向、髌腱应变和前交叉韧带（ACL）应变之间关系的体内数据很少。量化股四头肌如何通过髌腱加载ACL对于了解ACL损伤机制非常重要。我们假设屈曲角度，髌腱方向，髌腱应变影响ACL应变在单腿跳跃。具体来说，我们假设在跳跃过程中，当膝关节位于伸展位附近时，髌腱和ACL应变会同时增加。描述性实验室研究。通过磁共振成像（MRI）生成8名男性参与者的股骨、胫骨、ACL、髌腱和股四头肌腱附着部位的模型。获得单腿跳跃期间的高速双平面X线照片。将骨模型与X线片配准，从而再现骨、韧带和肌腱附着部位的体内位置。从注册的模型中测量髌腱角、髌腱方向、髌腱应变和ACL应变。ACL和髌腱应变通过将其在每个膝关节位置的长度标准化为MRI时的长度来近似。两个独立的双变量线性回归模型用于评估屈曲角度和髌腱方向之间的关系，ACL应变和髌腱应变之间的关系。使用多元线性回归模型评估屈曲角度和髌腱应变是否是跳跃飞行和着陆部分ACL应变的重要预测因素。屈曲角度和髌腱应变是ACL应变的重要预测因素（P <0.05）。这些结果表明，当膝关节处于伸展位附近时，同时观察到ACL和髌腱应变升高。髌腱和ACL应变的同时增加表明，当膝关节位于伸展位附近时，股四头肌通过髌腱加载ACL。当膝关节在着地前处于伸展位附近时，ACL应变增加可能是由于股四头肌收缩。因此，膝关节伸直时意外着陆可能会增加ACL损伤的脆弱性，因为绷紧的韧带更容易失效。
There is little in vivo data that describe the relationships between patellar tendon orientation, patellar tendon strain, and anterior cruciate ligament (ACL) strain during dynamic activities. Quantifying how the quadriceps load the ACL via the patellar tendon is important for understanding ACL injury mechanisms. We hypothesized that flexion angle, patellar tendon orientation, and patellar tendon strain influence ACL strain during a single-leg jump. Specifically, we hypothesized that patellar tendon and ACL strains would increase concurrently when the knee is positioned near extension during the jump. Descriptive laboratory study. Models of the femur, tibia, ACL, patellar tendon, and quadriceps tendon attachment sites of 8 male participants were generated from magnetic resonance imaging (MRI). High-speed biplanar radiographs during a single-leg jump were obtained. The bone models were registered to the radiographs, thereby reproducing the in vivo positions of the bones, ligament, and tendon attachment sites. Flexion angle, patellar tendon orientation, patellar tendon strain, and ACL strain were measured from the registered models. ACL and patellar tendon strains were approximated by normalizing their length at each knee position to their length at the time of MRI. Two separate bivariate linear regression models were used to assess relationships between flexion angle and patellar tendon orientation and between ACL strain and patellar tendon strain. A multivariate linear regression model was used to assess whether flexion angle and patellar tendon strain were significant predictors of ACL strain during the inflight and landing portions of the jump. Both flexion angle and patellar tendon strain were significant predictors (P < .05) of ACL strain. These results indicate that elevated ACL and patellar tendon strains were observed concurrently when the knee was positioned near extension. Concurrent increases in patellar tendon and ACL strains indicate that the quadriceps load the ACL via the patellar tendon when the knee is positioned near extension. Increased ACL strain when the knee is positioned near extension before landing may be due to quadriceps contraction. Thus, landing with unanticipated timing on an extended knee may increase vulnerability to ACL injury as a taut ligament is more likely to fail.
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DOI：
10.5435/00124635-201009000-00003
发表时间：
2010-09
期刊：
The Journal of the American Academy of Orthopaedic Surgeons
影响因子：
--
作者：
Boden BP;Sheehan FT;Torg JS;Hewett TE
通讯作者：
Hewett TE
影响因子：
2.4
作者：
Englander ZA;Martin JT;Ganapathy PK;Garrett WE;DeFrate LE
通讯作者：
DeFrate LE
影响因子：
2.4
作者：
Beynnon, BD;Fleming, BC
通讯作者：
Fleming, BC
影响因子：
3.8
作者：
Cerulli, G;Benoit, DL;Liti, A
通讯作者：
Liti, A
影响因子：
4.8
作者：
Abebe, Ermias S.;Moorman, C. T., III;DeFrate, Louis E.
通讯作者：
DeFrate, Louis E.