The Relationship of Anatomical Alignment and Strength of Some Lower Extremity Muscles with Jump-landing Biomechanics: A Landing Error Scoring System Study

Document Type: Original Article


1 PhD Candidate, Department of Biomechanics and Sports Medicine, Faculty of Physical Education and Sports Sciences, University of Kharazmi, Tehran, Iran

2 Associate Professor, Department of Biomechanics and Sports Medicine, Faculty of Physical Education and Sports Sciences, University of Kharazmi, Tehran, Iran

3 Assistant Professor, Department of Biomechanics and Sports Medicine, Faculty of Physical Education and Sports Sciences, University of Kharazmi, Tehran, Iran

4 Professor, Department of Rehabilitation, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran

5 Associate Professor, Department of Sport Biomechanics, Faculty of Physical Education and Sports Sciences, University of Mazandaran, Babolsar, Iran


Background: The purpose of the present study was to investigate correlative and predictive relationship of lower extremity anatomical alignment, isometric hip abduction and external rotation strength with jump-landing biomechanics using Landing Error Scoring System (LESS).
Methods: Anatomical alignment and isometric lower extremity muscle strength of 30 active men (mean age of 21.27±2.12 years) have been assessed through goniometry and dynamometry tests, respectively. Then, subjects have performed LESS test for the analysis of their jump-landing biomechanics.
Results: There was no significant correlative or predictive relationship between overall LESS score and femoral anteversion angle, tibiofemoral angle, Q angle, navicular drop, tibial torsion, abduction and external rotation isometric strength (P>.05). However, statistically significant negative correlation has been found between knee hyperextension angle and LESS score (P= .01, r= -.4).
Conclusion: The findings of the present study showed that lower extremity anatomical alignment and isometric strength measurements has no significant relationship with dynamic biomechanics of jump-landing. This is probably due to the difference in nature of static and isometric measurements and dynamic functional movements.


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