Department of Physical Therapy, Federal University of São Carlos, São Carlos, Brazil.
Postgraduate Program in Rehabilitation Sciences, Faculty of Health Sciences of Trairi, Federal University of Rio Grande do Norte, Santa Cruz, Brazil.
Sports Health. 2022 Nov-Dec;14(6):932-937. doi: 10.1177/19417381211063456. Epub 2021 Dec 27.
Dorsiflexion range of motion restriction has been associated with patellar tendinopathy, but the mechanisms of how dorsiflexion restriction could contribute to knee overload remain unknown.
Peak ankle dorsiflexion and ankle dorsiflexion excursion are negatively associated with peak vertical ground-reaction force (vGRF) and loading rate, and with peak patellar tendon force and loading rate, and positively associated with peak ankle plantar flexor moment.
Cross-sectional study.
Level 4.
Kinematic and kinetic data of 26 healthy recreational jumping athletes were measured during a single-leg drop vertical jump. Pearson's correlation coefficients were calculated to establish the association between peak ankle dorsiflexion and ankle dorsiflexion excursion with peak vGRF and vGRF loading rate, with peak patellar tendon force and patellar tendon force loading rate, and with peak ankle plantar flexor moment.
Ankle dorsiflexion excursion negatively correlated with peak vGRF loading rate ( = -0.49; = 0.011) and positively correlated with peak ankle flexor plantar moment ( = 0.52; = 0.006). In addition, there was a positive correlation between peak ankle dorsiflexion and peak vGRF ( = 0.39; = 0.05).
Ankle kinematics are associated with vGRF loading rate, ankle flexor plantar moment and peak vGRF influencing knee loads, but no association was observed between ankle kinematics and patellar tendon loads.
These results suggest that increasing ankle dorsiflexion excursion may be an important strategy to reduce lower limb loads during landings but should not be viewed as the main factor for reducing patellar tendon force.
背屈活动范围受限与髌腱病有关，但背屈受限如何导致膝关节过载的机制尚不清楚。
踝关节背屈峰值和踝关节背屈活动度与垂直地面反作用力峰值（vGRF）和加载率呈负相关，与髌腱峰值力和加载率呈负相关，与峰值踝关节跖屈力矩呈正相关。
横断面研究。
4 级。
在单腿垂直跳下落过程中测量了 26 名健康娱乐跳跃运动员的运动学和动力学数据。计算了 Pearson 相关系数，以建立踝关节背屈峰值和踝关节背屈活动度与垂直地面反作用力峰值和垂直地面反作用力加载率、髌腱峰值力和髌腱力加载率以及踝关节跖屈肌峰值力矩之间的关联。
踝关节背屈活动度与垂直地面反作用力加载率呈负相关（ = -0.49； = 0.011），与踝关节跖屈肌峰值力矩呈正相关（ = 0.52； = 0.006）。此外，踝关节背屈峰值与垂直地面反作用力峰值呈正相关（ = 0.39； = 0.05）。
踝关节运动学与垂直地面反作用力加载率、踝关节跖屈肌峰值力矩和垂直地面反作用力峰值有关，这些因素影响膝关节负荷，但踝关节运动学与髌腱负荷之间没有相关性。
这些结果表明，增加踝关节背屈活动度可能是降低着陆时下肢负荷的重要策略，但不应将其视为降低髌腱力的主要因素。
