Studying the effect of Rheumatoid Arthritis (RA) on tendons. Tenosynovitis is one of the common features of rheumatoid arthritis in the hand. It affects both the extensor and flexor tendons, sometimes leading to granulomatous involvement and tendon rupture. The commonest sites of rupture are well known but the areas of more general tendon involvement are less understood.
exists and is an alternate of . The main process by which mountains form is through tectonic activity. When two tectonic plates collide, the crust is crumpled and pushed upwards to form mountains (as an analogy, imagine the effect of pushing a rug up against the wall).
Mountains and valleys form in many ways. Two types of tectonic forces can result in mountains and valleys: compression (squishing) and extension (pulling apart). These forces commonly associate with mountain building but also form valleys. Compressing continents occur when two continents collide.