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Knee and ankle joint forces during steps and jumps down from two different heights.
1Kinesiology Research Group, Departments of Anatomy, Physical Medicine and Occupational Medicine, Karolinska Institute and Hospital, Stockholm, Sweden.
Clinical Biomechanics (Bristol, Avon)
|August 7, 2013
Summary
Jumping and stepping from heights places significant load on knee and ankle joints. Higher step-downs increase knee moments and compressive forces, potentially explaining pain avoidance strategies.
Area of Science:
- Biomechanics
- Orthopedics
- Sports Medicine
Background:
- Understanding joint loading during common activities like stepping and jumping is crucial for injury prevention.
- Previous research has not fully quantified the impact of step height on lower extremity joint forces and moments.
Purpose of the Study:
- To calculate ankle and knee joint load moments and forces during stepping and jumping from different heights.
- To investigate the influence of step height on biomechanical loading of the knee and ankle.
Main Methods:
- Two healthy subjects performed 14 different step and jump movements from 0.20 m and 0.43 m heights.
- Ground reaction forces were measured using Kistler force platforms.
- A sagittal plane semi-dynamic biomechanical model was used to calculate joint moments and forces.
Main Results:
- Vertical ground reaction forces (Fz) ranged from approximately 1 to 2 body weight (bw) depending on step height and technique.
- Knee moments reached approximately 100 Nm from the higher (0.43 m) step-down, resulting in knee joint compressive forces of 4-7 bw.
- Ankle joint loading was substantial but less sensitive to step height variations compared to the knee.
Conclusions:
- Higher step-down heights significantly increase knee joint moments and compressive forces.
- The substantial knee loading may contribute to pain experienced by individuals with knee conditions.
- Further investigation into backward step-downs is warranted to understand pain avoidance mechanisms.
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