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Hyperextension in the lower extremities, such as knee hyper extension shown here (see figure 5), not only puts added strain on the opposing musculature, but it also leads to added stress on numerous joints and muscles throughout the trunk, spine, shoulders, and even all the way to the cervical spine and tempermandibular joints. Knee hyper extension can cause the foot arches to flatten, the tibia rotate inward, the pelvis to shift and rotate forward, and cause abnormal spinal curvature and excessive forward head positioning. This habitual standing posture can result in what is referred to as upper and lower cross body syndrome (see figure 6). These poor postural habits lead to shortening, weakness and inhibition of key core stabilizers resulting in misalignment and pain in joints. And, what happens at our base of support, sitting or standing, affects the positioning of the rest of the body.
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Diana Jovin (Disjointed Navigating the Diagnosis and Management of Hypermobile Ehlers-Danlos Syndrome and Hypermobility Spectrum Disorders)