Category A - full version without watermark 720x576 (check terms and conditions at The embed version with watermark is free of charge. - Description: An arthrosis is a joint, an area where two bones are attached for the purpose of motion of body parts. An arthrosis (joint) is usually formed of fibrous connective tissue and cartilage. Arthrosis is caused by fibrosis or degeneration of the articular cartilage affecting one or various articulations. The lesion can appear in any articulation, although the most affected are the ones that support the weight of our body. That means, the knees, hips, the spine and also fingers and toes where some nodules can appear. Joints are grouped according to their motion: a ball and socket joint; a hinge joint; a condyloid joint (a joint that permits all forms of angular movement except axial rotation); a pivot joint; gliding joint; and a saddle joint.