Dowling Brittany, Mcpherson April L, Paci James M
Motus Global, Rockville Center, NY, USA -
Mayo Clinic Graduate School of Biomedical Sciences, Rochester, MN, USA.
J Sports Med Phys Fitness. 2018 Jun;58(6):867-874. doi: 10.23736/S0022-4707.17.07348-0. Epub 2017 Jun 21.
Passive ankle dorsiflexion range of motion (DROM) measures have been identified as a risk factor for injury during landings. However, passive measurements might not be indicative of dynamic ankle movement, whereas a weightbearing ROM might be a better tool when evaluating movement. The purpose of this study was to investigate the relationship between weightbearing DROM and sagittal plane landing mechanics in a single leg drop jump task.
Seventy-three male athletes (22.1±3.9 years old, height 186.2±11 cm, and weight 100.2±21.8 kg) performed bilateral modified-lunge tasks and bilateral single leg drop jump landings while 3D kinematic data were collected. Hip, knee, and ankle joint angles were calculated at initial contact (IC) maximum knee flexion (MKF), and total excursion (TE) during a single leg drop jump landing.
No bilateral differences in DROM and single leg landing mechanics existed. Decreased ankle DROM was correlated to decreased ankle dorsiflexion at MKF (P=0.00) and TE (P=0.00) for both dominant and non-dominant limbs. Decreased ankle DROM was also correlated to decreased knee flexion at IC (P=0.00), MKF (P=0.00), and TE (P=0.1), for both dominant and non-dominant limbs. Ankle DROM correlated to hip flexion at MKF (r=0.25) and TE (r=0.30) in the dominant limb.
Restrictions in DROM may contribute to a stiff landing with less flexion at the ankle and knee. These findings may be useful in designing training programs aimed at increasing DROM in order to improve an athlete's landing mechanics and decrease risk of injury.
被动踝关节背屈活动度（DROM）测量已被确定为着陆时受伤的风险因素。然而，被动测量可能无法反映动态踝关节运动，而负重活动度在评估运动时可能是一个更好的工具。本研究的目的是调查在单腿下落跳任务中负重DROM与矢状面着陆力学之间的关系。
73名男性运动员（年龄22.1±3.9岁，身高186.2±11厘米，体重100.2±21.8千克）进行双侧改良弓步任务和双侧单腿下落跳着陆，同时收集三维运动学数据。计算单腿下落跳着陆过程中初始接触（IC）、最大膝关节屈曲（MKF）和总偏移（TE）时的髋关节、膝关节和踝关节角度。
DROM和单腿着陆力学方面不存在双侧差异。优势侧和非优势侧踝关节DROM降低均与MKF（P = 0.00）和TE（P = 0.00）时踝关节背屈降低相关。优势侧和非优势侧踝关节DROM降低还与IC（P = 0.00）、MKF（P = 0.00）和TE（P = 0.1）时膝关节屈曲降低相关。优势侧肢体在MKF（r = 0.25）和TE（r = 0.30）时踝关节DROM与髋关节屈曲相关。
DROM受限可能导致着陆僵硬，踝关节和膝关节屈曲减少。这些发现可能有助于设计旨在增加DROM的训练计划，以改善运动员的着陆力学并降低受伤风险。
