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Biomechanics during cross-body lunging in individuals with and without symptomatic femoroacetabular impingement Graffos, Angelo

Abstract

Introduction: Femoroacetabular impingement (FAI) is a patho-mechanical hip condition that involves abnormal contact between the femoral head/neck and the pelvis acetabulum. This abnormal contact can lead to impingement and restrictions in hip motion, particular in end-range hip flexion, adduction and/or internal rotation. Most of the biomechanical research to date has involved the symptomatic population (sFAI), where motion analysis was used to quantify differences in movement performance compared to healthy populations. However, the study of asymptomatic FAI (aFAI) is also important due to its high prevalence in the general population. The prevalence of FAI is also high in the athletic population; however there is a lack of studies that have analyzed a sport-specific movement. One such movement is the lunge, and because of the multidirectional nature of many sports, the 45˚ cross-body lunge was specifically chosen to be biomechanically analyzed. Purpose: The purpose of this thesis was to compare trunk and lower limb biomechanics during the 45˚ cross-body lunge between sFAI, aFAI and healthy control populations. Methods: 33 total participants were recruited: 9 sFAI, 13 aFAI and 11 healthy individuals. In a single session, these participants were asked to perform the 45˚ cross-body lunge. Trunk, pelvis, hip, knee and ankle kinematics, as well as hip, knee and ankle kinetics and vertical ground reaction forces were examined. Results: Overall, there were very few statistically significant between-group differences in 45˚ cross-body lunge performance. Prior to outlier removal, though, the sFAI group exhibited a larger pelvis sagittal plane excursion during the entire movement than the aFAI group (p=0.046). After outlier removal, this difference was no longer statistically significant. As for knee sagittal moment net impulse, the only statistically significant difference became evident after outlier removal, where the aFAI group exhibited a larger knee sagittal moment net impulse than the control group (p=0.016). Conclusions: The results of our study generally show that sFAI, aFAI and healthy control populations perform the 45˚ cross-body lunge similarly. However, future research should aim to better understand pelvis and knee biomechanics during sporting activities like the lunge, as these parameters may have important implications in rehabilitation and sport performance.

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Attribution-NonCommercial-NoDerivatives 4.0 International

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