Joints are capsules that are made of cartilage, bursae, ligaments and tendons which hold together two or more bones allowing movement. Partial or full dislocation of joints can occur.
Cartilage is another fibrous connective tissue that forms smooth surfaces over the ends of bones during the point in which they meet. This allows movement and absorption from impact and friction. Often injury involving this is a side effect of joint injury. More often than not it arises from a trauma that then leads to the wearing and/or tearing of the cartilage.
Bursae are small sacs of fluid aiming to reduce friction within joints. They are usually located where muscles and tendons go over bone. Bursitis is an inflammation from overuse or infection.
Tendons are again fibrous and connective tissues that connect muscles to bones. In doing this they help produce movement by allowing force to be exerted. Strains or ruptures of a tendon can occur and tendinopathy is pain caused when overused or from repetitive activity.