La Crosse Institute for Movement Science, Department of Health Professions-Physical Therapy Program, University of Wisconsin-La Crosse, 1725 State Street, LaCrosse, WI 54601, United States.
Phys Ther Sport. 2011 May;12(2):93-9. doi: 10.1016/j.ptsp.2010.10.002. Epub 2010 Dec 4.
Evaluate the effects of a weight-bearing neuromuscular training program on 2D and 3D lower extremity kinematics during a single leg step down.
Pre-test, post-test quasi experimental.
Laboratory.
Sixty nine healthy females performed a single leg step down. The 20 females with the most medial knee orientation during this task participated in this study (20.0 yr (1.6 yr), 167.9 cm (6.0 cm), 63.2 kg (8.3 kg)).
2D knee frontal plane projection angle (FPPA) and 3D lower extremity joint (hip and knee) and segment (pelvis and femur) angles during a single leg step down before and after training were compared using paired t-tests. Pearson correlation coefficients were used to measure the association of 2D and 3D kinematic changes following training.
Knee FPPA decreased 4.6° after training (P < 0.001). Hip flexion (P < 0.001) and hip adduction (P = 0.04) increased after training. However, no other 3D joint kinematic changes were observed. Segment angle changes included decreased femoral internal rotation (P = 0.008) and adduction (P = 0.08) and increased anterior pelvic tilt (P < 0.001) and contralateral pelvic drop (P = 0.02). The association between changes in 2D and 3D joint kinematics ranged from 0.12 to 0.34.
Exercises intended to improve altered lower extremity kinematics may reduce medial knee 2D FPPA values during a single leg step down. However, this 2D change may not be linked with any specific change in 3D joint kinematics.
评估一种负重神经肌肉训练计划对单腿跳下时 2D 和 3D 下肢运动学的影响。
预测试，后测试准实验。
实验室。
69 名健康女性进行了单腿跳下。在这项任务中，20 名膝关节内偏角最大的女性参与了这项研究（20.0 岁（1.6 岁），167.9 厘米（6.0 厘米），63.2 公斤（8.3 公斤））。
使用配对 t 检验比较训练前后单腿跳下时 2D 膝关节额状面投影角（FPPA）和 3D 下肢关节（髋关节和膝关节）和节段（骨盆和股骨）角度。使用皮尔逊相关系数测量训练后 2D 和 3D 运动学变化的相关性。
训练后膝关节 FPPA 减少 4.6°（P < 0.001）。髋关节屈曲（P < 0.001）和髋关节内收（P = 0.04）增加。然而，没有观察到其他 3D 关节运动学变化。节段角度变化包括股骨内旋（P = 0.008）和内收（P = 0.08）减少，以及前骨盆倾斜（P < 0.001）和对侧骨盆下降（P = 0.02）增加。2D 和 3D 关节运动学变化之间的相关性范围为 0.12 至 0.34。
旨在改善下肢运动学异常的运动可能会降低单腿跳下时膝关节 2D FPPA 值。然而，这种 2D 变化可能与 3D 关节运动学的任何特定变化无关。
