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Title: Do the gluteal muscles influence dynamic knee valgus when single-leg landing?
Author: Neamatallah, Z. A.
ISNI:       0000 0004 7430 9684
Awarding Body: University of Salford
Current Institution: University of Salford
Date of Award: 2018
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Background: The presence of dynamic knee valgus on landing has been found to be a significant risk factor in the development non-contact anterior cruciate ligament ACL injury. Gluteal muscles especially gluteus maximus and medius are believed to have a role in controlling hip motion that is associated with dynamic knee valgus. Landing onto one leg is a common scenario of ACL injury mechanism and would appear to require considerable Gluteal muscle activity to control the forces if the relationship were true. Aim: the aim of the study was to investigate the relationship between the Gluteal muscles (strength and EMG activity) and the degree of dynamic knee valgus during Single Leg Squat (SLS) and multi-directional single leg landing. Methods: Thirty-four active, healthy participants comprising of 17 males and 17 females participated in this study. Hip extension and abduction isokinetic (concentric/eccentric) strength was assessed, gluteus maximus and gluteus medius muscles Electromyography (EMG) activity was also assessed along with 3D motion lower limb biomechanics during SLS and multi-directional single leg landing tasks. Findings: Moderate correlations were found between gluteus medius EMG activity and hip adduction angles during all landing tasks with R2 ranging from 0.13 to 0.22. Gluteus medius EMG activity moderately correlated with knee abduction angle during right SLS and with internal hip rotation angle during left SLS. Significant moderate to strong correlations between hip abductors’ and extensors’ strength and knee abduction angle, hip adduction angle, knee abduction moment, hip adduction moment and internal hip rotation moment were found during landing tasks with R2 ranging from 0.11 to 0.26. Conclusion: There appears to be limited to moderate relationships existing between Gluteal muscles strength and EMG activity and lower limb biomechanical variables during SLS and multi-directional single leg landing tasks. Furthermore, the relationship appears also to be task, limb and gender dependent. Keywords: ACL, Landing, gluteal muscles, Hip, Strength, EMG, Biomechanics.
Supervisor: Not available Sponsor: Ministry of Higher Education, Saudi Arabia
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available