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Hop Distance Symmetry Moderately Reflects Knee Biomechanics Symmetry During Landing But Not For Controlled
Stefano Di Paolo1, Naoaki Ito2, Kayla D Seymore2
1Clinica Ortopedica e Traumatologica II IRCCS Istituto Ortopedico Rizzoli.
International Journal of Sports Physical Therapy
|September 13, 2024
Summary
The hop test battery reflects knee landing biomechanics, with symmetry in single and triple hop tests correlating with better knee function. These findings support using hop tests for clinical decisions regarding knee injury risk.
Area of Science:
- Biomechanics
- Orthopedics
- Sports Medicine
Background:
- Poor knee biomechanics during landing is a risk factor for Anterior Cruciate Ligament (ACL) injuries.
- The utility of the horizontal hop test battery in assessing knee function and biomechanics remains unclear.
Purpose of the Study:
- To determine the relationship between the clinical limb symmetry index (LSI) and knee biomechanics during the hop test battery.
- To investigate correlations between LSI and knee landing/propulsion biomechanics using markerless motion capture.
Main Methods:
- A cross-sectional study involving 42 participants (with and without knee surgery) performing a hop test battery.
- Markerless motion capture technology was used to collect 3D kinematic data during single hop, crossover hop, triple hop, and 6-m timed hop.
- Spearman correlation analysis assessed the relationship between clinical LSI and kinematic symmetry.
Main Results:
- Symmetry in single and triple hop tests showed positive correlations with knee landing biomechanics.
- The triple hop test demonstrated significant correlations with both propulsion and landing knee biomechanics.
- No significant correlations were found for the crossover hop test.
Conclusions:
- Hop test battery performance, particularly single and triple hop symmetry, reflects knee landing biomechanical symmetry.
- The hop test battery is a valuable tool for assessing knee function and informing clinical decisions for injury prevention.
- Asymmetrical performance in hop tests indicates asymmetrical knee landing biomechanics, highlighting injury risk.
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