- The zygapophyseal joints are synovial joints between the articular processes.
- Synovial membranes lining the inside of the joint produce synovial fluid that provides nutrition to articular cartilage.
- Its tendon passes laterally through the same osteofibrous canal in the same synovial sheath as extensor digitorum longus and terminates on the fifth metatarsal.
- Theories include vascular insufficiency or micro-fractures of the subchondral plate, with synovial fluid being forced from the synovial space into the bone.
- The elbow joint is a synovial hinge joint limited to flexion and extension.