There are two main ways to classify joints in the human body. Structural classification divides joints into three categories - fibrous, cartilaginous, and synovial - based on how the bones connect and whether a space exists between them. Functional classification also has three categories - synarthrosis, amphiarthrosis, and diarthrosis - and considers the degree of movement permitted at each joint. Synovial joints allow the most movement as diarthrosis joints, while fibrous joints permit the least movement and are mostly synarthrosis joints.

1. Articulations – Articulations are more commonly called “joints.” By definition, an articulation is the junction between two or more bones, regardless of how much (or how little) actual movement is permitted. The function of joints is exemplified in their capacity to permit movement of the human body.

2. Articulations or joints can be classified in two ways: Structural Classification – three categories based on how the bones involved are connected to each other. Functional Classification – three categories based on the degree of movement permitted by the joint.