The shoulder is an inherently unstable joint and requires well-coordinated muscle work and an appropriate sensorimotor system for it to remain stable. The sensorimotor system is defined as all the sensory, motor, central integration and processing components involved in maintaining joint stability. Shoulder action involving overhead work places great demands on the shoulder joint and can result in shoulder lesions, such as impingement syndrome. Moreover, activities requiring repetitive arm movements, including high velocity actions, have also been identified as a risk factor for shoulder impingement.
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