Overuse can lead to a repetitive strain injury. These days we tend to relate it to computer use with the muscles and joints affected tending to be those in the arms, hands and shoulder areas. Carpal Tunnel Syndrome is the most common. What causes RSI injuries? They’re mostly down to poor posture, sitting in the same position for too long, using the same muscle repeatedly without a break, stress, even vibrating equipment.
Caused by the joints being over used (ie wear and tear), the cartilage rubs away so that bone ends up rubbing against bone and forming osteophytes (new bone-like growth). It results in pain and inflamed joints. Movement is restricted to the point it can prove extremely debilitating.