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THE BIOMECHANICAL EFFECTS THAT TAKES PLACE WITH A WEAKENED GLUTEUS MUSCLE

by *Heather * on March 20, 2011

This week's Topic of the Week is written in a more advanced language to encouarge you to stimulate the muscle that is your brain... as well as to encourage you to exercise the muscle that is your glutues medius.  Amazing how one small, weakened muscle can cause so many issues throughout the body... read on to learn more
                  THE BIOMECHANICAL EFFECTS THAT TAKES PLACE WITH A WEAKENED GLUTEUS MUSCLE               THE BIOMECHANICAL EFFECTS THAT TAKES PLACE WITH A WEAKENED GLUTEUS MUSCLE       THE BIOMECHANICAL EFFECTS THAT TAKES PLACE WITH A WEAKENED GLUTEUS MUSCLE
                              Posterior (backside)                                Lateral (side view)                                        Anterior (front view)

Optimal joint stability is achieved when the balance between performance and effort is optimized to economize the use of energy.  Instability implicates altered laxity or stiffness values leading to increased joint translations (excessive motion). This results in a new joint position usually with exaggerated or reduced joint compression with a disturbance in performance/effort ratio.
Hip centering moment arms
A weakened gluteus medius muscles, as seen here on the right side of this pictoral diagram, causes unleveling of the pelvis which disrupts      biomechanical forces necessary for proper firing of muscles and stabilization of various joints.
2cm superior (upward) displacement decreases abduction (away from the body) forces 44% and increases the moment arm(work required to perform) 49%. Superior displacement decreased hip flexion force 29% and increases moment arm 22%
Inferior (downward) displacement increases abduction force 20% and moment arm 22%.  Flexion forces increased 4% and the moment arm 12%

Delp et al 1993 Journal of Biomechanics

THE BIOMECHANICAL EFFECTS THAT TAKES PLACE WITH A WEAKENED GLUTEUS MUSCLE

Hip Stabilization
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