The Effect of Limited Ankle Dorsiflexion During Emergency Stop-Jump Movements on Lower Limb Biomechanics.

IF 2.3 3区医学 Q1 ORTHOPEDICS

Journal of Foot and Ankle Research Pub Date : 2026-06-01 DOI:10.1002/jfa2.70165

Yijing Zhou, Nan Yang, Qiaoqiao Wang, Yuan Wu, Haitao Shi, Si Zhang, Shuang Ren, Hongshi Huang

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Abstract

Objective: The stop-jump task is a key movement in sports such as basketball and volleyball, with landing biomechanics closely linked to injury risk. Restricted ankle dorsiflexion (DF) alters lower-extremity mechanics and increases the risk of lower-limb joint injuries; however, its effects on the full stop-jump cycle remain unclear. This study examined how restricted DF influences lower-extremity biomechanics during the stop-jump task and explored the mechanisms underlying a stiff landing strategy and its potential injury risks.

Methods: Participants underwent static ankle dorsiflexion range of motion (DF ROM) testing and functional squat assessment. Eligible participants completed walking and stop-jump tasks, with biomechanical data collected synchronously using motion capture and force plates. Based on peak ankle dorsiflexion angle during walking, 44 participants were categorized into restricted (RADF, n = 22) and unrestricted (unRADF, n = 22) groups. Group differences in lower-extremity biomechanics across stop-jump phases were analyzed using ANCOVA with sex as a covariate, with post hoc power reported.

Results: The RADF group demonstrated significantly greater peak vertical ground reaction force (GRF) and posterior loading rates (LRs) compared with the unRADF group (p < 0.05). During the horizontal landing phase, ankle plantarflexion and internal rotation angles were significantly increased in the RADF group (p < 0.05). At the moment of peak GRF during the vertical landing phase, the RADF group exhibited significantly reduced ankle dorsiflexion angle (p < 0.001) and significantly greater knee abduction angle (p < 0.05). Additionally, leg stiffness was significantly higher in the RADF group during this phase (p < 0.05).

Conclusion: Individuals with restricted DF adopt a stiff landing strategy during stop-jump, with increased impact loads and abnormal joint kinetics that may impair shock absorption and elevate lower-extremity injury risk.

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紧急停跳运动中有限踝关节背屈对下肢生物力学的影响。

目的：停跳动作是篮球、排球等运动项目的关键动作，落地生物力学与损伤风险密切相关。限制性踝关节背屈（DF）改变下肢力学，增加下肢关节损伤的风险；然而，它对整个停止-跳跃循环的影响尚不清楚。本研究考察了受限DF如何影响停跳任务中的下肢生物力学，并探讨了僵硬着陆策略及其潜在损伤风险的机制。方法：参与者进行了静态踝关节背屈运动范围（DF ROM）测试和功能性深蹲评估。符合条件的参与者完成了步行和停跳任务，并使用动作捕捉和力板同步收集生物力学数据。根据行走时踝关节背屈的峰值角度，将44名参与者分为受限组（RADF, n = 22）和非受限组（unRADF, n = 22）。使用ANCOVA分析停跳阶段下肢生物力学的组间差异，其中性别为协变量，并报告事后功率。结果：与unRADF组相比，RADF组表现出更大的峰值垂直地面反力（GRF）和后载荷率（LRs） (p)。结论：受限DF个体在停跳过程中采用僵硬的着陆策略，增加了冲击载荷和关节动力学异常，可能会损害减震性并增加下肢损伤的风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Foot and Ankle Research ORTHOPEDICS-

CiteScore

4.50

自引率

10.30%

发文量

审稿时长

>12 weeks

期刊介绍： Journal of Foot and Ankle Research, the official journal of the Australian Podiatry Association and The College of Podiatry (UK), is an open access journal that encompasses all aspects of policy, organisation, delivery and clinical practice related to the assessment, diagnosis, prevention and management of foot and ankle disorders. Journal of Foot and Ankle Research covers a wide range of clinical subject areas, including diabetology, paediatrics, sports medicine, gerontology and geriatrics, foot surgery, physical therapy, dermatology, wound management, radiology, biomechanics and bioengineering, orthotics and prosthetics, as well the broad areas of epidemiology, policy, organisation and delivery of services related to foot and ankle care. The journal encourages submissions from all health professionals who manage lower limb conditions, including podiatrists, nurses, physical therapists and physiotherapists, orthopaedists, manual therapists, medical specialists and general medical practitioners, as well as health service researchers concerned with foot and ankle care. The Australian Podiatry Association and the College of Podiatry (UK) have reserve funds to cover the article-processing charge for manuscripts submitted by its members. Society members can email the appropriate contact at Australian Podiatry Association or The College of Podiatry to obtain the corresponding code to enter on submission.