Jacqueline Perry Musculoskeletal Biomechanics Research Laboratory, University of Southern California, Los Angeles, CA, USA.
J Orthop Sports Phys Ther. 2010 Sep;40(9):568-76. doi: 10.2519/jospt.2010.3313.
Controlled laboratory study using a cross-sectional design.
To evaluate knee joint dynamics in elite volleyball players with and without a history of patellar tendinopathy, focusing on mechanical energy absorption and generation. We hypothesized that tendinopathy would be associated withreduced net joint work and net joint power.
Patellar tendinopathy is a common, debilitating injury affecting competitive volleyball players.
Thirteen elite male players with and without a history of patellar tendinopathy (mean ± SD age, 27 ± 7 years) performed maximum-effort volleyball approach jumps. Sagittal plane knee joint kinematics, kinetics, and energetics were quantified in the lead limb, using data obtained from a force platform and an 8-camera motion analysis system. Vertical ground reaction forces and pelvis vertical velocity at takeoff were examined. Independent sample t tests were used to evaluate group differences (α = .05).
The tendinopathy group, compared to controls, demonstrated significant reductions (approximately 30%) in net joint work and net joint power during the eccentric phase of the jump, with no differences in the concentric phase. Positive to-negative net joint work and net joint power ratios were significantly higher in the tendinopathy group, which had a net joint work ratio of 1.00 (95% CI: 0.77, 1.24) versus 0.76 (95% CI: 0.64, 0.88) for controls, and a net joint power ratio of 1.62 (95% CI: 1.15, 2.10) versus 1.00 (95% CI: 0.80, 1.21) for controls. There were no significant differences in net joint moment, angular velocity, or range of motion. Peak vertical ground reaction forces were lower for the tendinopathy group, while average vertical ground reaction forces and pelvis vertical velocity were similar.
Patellar tendinopathy is associated with differences in sagittal plane mechanical energy absorption at the knee during maximum-effort volleyball approach jumps. Net joint work and net joint power may help define underlying mechanisms, adaptive effects, or rehabilitative strategies for individuals with patellar tendinopathy.
采用横断面设计的对照实验室研究。
评估有和无髌腱病病史的精英排球运动员的膝关节动力学，重点关注机械能量吸收和产生。我们假设髌腱病与净关节功和净关节功率降低有关。
髌腱病是一种常见的、使人虚弱的损伤，影响着竞技排球运动员。
13 名有和无髌腱病病史的精英男性排球运动员（平均±标准差年龄，27±7 岁）进行最大努力排球助跑跳跃。使用力平台和 8 摄像机运动分析系统获得的数据，对主导肢体进行矢状面膝关节运动学、动力学和能量学分析。研究还检测了起跳时的垂直地面反作用力和骨盆垂直速度。使用独立样本 t 检验评估组间差异（α=0.05）。
与对照组相比，髌腱病组在跳跃的离心阶段的净关节功和净关节功率明显降低（约 30%），而在向心阶段没有差异。髌腱病组的正-负净关节功和净关节功率比显著更高，其净关节功比为 1.00（95%置信区间：0.77，1.24），而对照组为 0.76（95%置信区间：0.64，0.88），净关节功率比为 1.62（95%置信区间：1.15，2.10），而对照组为 1.00（95%置信区间：0.80，1.21）。净关节力矩、角速度和运动范围没有显著差异。髌腱病组的最大垂直地面反作用力较低，而平均垂直地面反作用力和骨盆垂直速度相似。
髌腱病与最大努力排球助跑跳跃时膝关节矢状面机械能量吸收的差异有关。净关节功和净关节功率可能有助于定义髌腱病患者的潜在机制、适应效应或康复策略。
