Psoriatic arthritis is a long-term inflammatory disease that happens when your immune system attacks your joints and skin. But where the symptoms appear on your body depends on which of the five ...

There are five types of PsA, depending on which joints it affects. Distal interphalangeal PsA, for instance, affects the fingers and finger joints. Spondylitis, on the other hand, causes symptoms ...

Types of synovial joints. Four of the synovial joint types are responsible for a range of sporting techniques. Hinge - these can be found in the elbow, knee and ankle.

The types of joints we (and most vertebrates) share most likely originated from the same common ancestor. But it’s not a feature that we share with all vertebrates.