Muscular Contributions And Hip And Knee Extension During The Single Limb Stance Phase Of Normal Gait

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The article “Muscular contributions to hip and knee extension during the single limb stance phase of normal gait: a Theoretical Framework for Crouch Gait” by Allison Arnold, Frank Anderson, Marcus Pandy, and Scott Delp investigates the biomechanics of normal gait in hopes to uncover ideas to help determine treatments for crouch gait. Crouch gait is a bothersome abnormality that affects the gait pattern of people who suffer from the condition of cerebral palsy. It’s characterized by excessive flexion of the hips and knees during standing and excessive use of metabolic energy to complete a single gait cycle. Currently, the treatments for this condition are limited and have unpredictable outcomes due to the unknown biomechanical causes of the excessive flexion in crouch gait. These treatments include surgical lengthening of hamstrings, ankle-foot orthoses, and intense stretching regimens, with patients experiencing results ranging from no improvement in their symptoms to dramatic improvements. The vast array of results from treatments are due to the little understanding medical professionals have of not only abnormal gait patterns (such as crouch gait) but of normal gait as well (Arnold, Anderson, Pandy, and Delp, 2005). Despite the article’s title relating to crouch gait, the purpose of the study conducted was to examine and quantify the accelerations of normal hip and knee movements that were induced by specific muscles during the single limb stance phase and to rank these

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