Patellofemoral kinematics during weight-bearing and non-weight-bearing knee extension in persons with lateral subluxation of the patella: A preliminary study
Patellofemoral kinematics during weight-bearing and non-weight-bearing knee extension in persons with lateral subluxation of the patella: A preliminary study
复制标题
DOI：
10.2519/jospt.2003.33.11.677
复制
发表时间：
2003-11-01
影响因子：
6.1
通讯作者：
Shellock, FG
中科院分区：
文献类型：
--
作者：
Powers, CM;Ward, SR;Shellock, FG
研究设计：单组，重复测量design.Objective：To comparison patellofemoral joint kinetics during weight-bearing and non-weight-bearing knee extension in persons with lateral suluxation of the patella.Background：以前唯一的研究，以量化髌股关节运动学差异在负重和非负重任务是有限的，在静态负荷条件下使用。髌股关节运动学之间的负重和非负重条件下的差异还没有被量化dynamic movement.Methods和Measures：6名女性诊断髌股关节疼痛和髌骨外侧半脱位参加。采用动态磁共振成像技术，在非负重（5%体重阻力）和负重（单侧下蹲）条件下，当受试者将膝关节从45 °伸展至0 °时，获得髌股关节的轴向图像。髌股关节关系的测量（内侧/外侧髌骨移位和髌骨倾斜），以及股骨和髌骨相对于外部参考系统的旋转（即图像视野），在膝关节伸展过程中以3度增量获得。在非负重膝关节伸展期间，膝关节伸直30 ° ~ 12 °时髌骨外侧移位较负重时明显，27 °时达到统计学显著性，24度和21度。两种情况下髌骨外侧倾斜度无差异（P = 0.065）。在负重条件下，股骨内旋显著大于非负重条件下，膝关节从18 °伸展至0 °。在非承重条件下，外侧髌骨旋转的量是显着大于在整个范围的运动tested.Conclusions承重条件：本研究的结果表明，外侧髌骨位移是更明显的非承重膝关节伸展相比，承重膝关节伸展的人与外侧髌骨半脱位。此外，本研究的结果表明，髌股关节的运动学在非负重期间可以被表征为髌骨在股骨上旋转，而在负重条件下的髌股关节的运动学可以被表征为股骨在髌骨下旋转。
Study Design: Single-group, repeated-measures design.Objective: To compare patellofemoral joint kinematics during weight-bearing and non-weight-bearing knee extension in persons with lateral subluxation of the patella.Background: The only previous study to quantify differences in patellofemoral joint kinematics during weight-bearing and non-weight-bearing tasks was limited in that static loading conditions were utilized. Differences in patellofemoral joint kinematics between weight-bearing and non-weight-bearing conditions have not been quantified during dynamic movement.Methods and Measures: Six females with a diagnosis of patellofemoral pain and lateral subluxation of the patella participated. Using kinematic magnetic resonance imaging, axial images of the patellofemoral joint were obtained as subjects extended their knee from 45degrees to 0degrees during non-weight-bearing (5% body weight resistance) and weight-bearing (unilateral squat) conditions. Measurements of patellofemoral joint relationships (medial/lateral patellar displacement and patellar tilt), as well as femur and patella rotations relative to an external reference system (ie, the image field of view), were obtained at 3degrees increments during knee extension.Results: During non-weight-bearing knee extension, lateral patellar displacement was more pronounced than during the weight-bearing condition between 30degrees and 12degrees of knee extension, with statistical significance being reached at 27degrees, 24degrees, and 21degrees. No differences in lateral patellar tilt were observed between conditions (P = .065). During the weight-bearing condition, internal femoral rotation was significantly greater than during the non-weight-bearing condition as the knee extended from 18degrees to 0degrees. During the non-weight-bearing condition, the amount of lateral patellar rotation was significantly greater than during the weight-bearing condition throughout the range of motion tested.Conclusions: The results of this study demonstrated that lateral patellar displacement was more pronounced during non-weight-bearing knee extension compared to weight-bearing knee extension in persons with lateral patellar subluxation. In addition, the results of this investigation suggest that the patellofemoral joint kinematics during non-weight-bearing could be characterized as the patella rotating on the femur, while the patellofemoral joint kinematics during the weight-bearing condition could be characterized as the femur rotating underneath the patella.