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

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.