When viewed under a microscope, normal tissue can be organized in a couple of different fashions: dense, regular elongated fibers running in the same direction, such as tendons and ligaments; or dense and loose, irregular with fibers running in multiple directions. In either instance, when tissue is damaged, it will often heal in a fibrotic, haphazard manner and may appear radio-dense under diagnostic ultrasound. The tissue may show thickening, irregular organization or less precise margins as compared to non-injured tissues, which results in a restricted range of motion and, very often, pain and functional limitations.