Definition: Repetitive Strain Injury (RSI) is a term used to describe damage sustained by tissues, such as tendons, ligaments and nerves, from repetitive demand over time. The damage results in inflammation and tissue changes which can lead to a wide range of symptoms such as aching, throbbing, pins and needles, numbness and/or weakness in and around the affected area. RSI often results from occupational (mouse and computer work, hammering) or recreational activities (throwin