How is scar tissue different from other tissue?

When viewed under a microscope, normal tissue can take a couple of different fashions: dense, regular elongated fibers running in the same direction, such as tendons and ligaments; or dense, irregular and loose with fibers running in multiple directions. In either instance, when tissue is damaged, it will heal in a haphazard pattern--or scarring--that results in a restricted range of motion and, very often, pain.