A pseudo joint, also known as a "transitional joint," refers to an abnormal articulation, specifically when a vertebra is connected to the pelvis in a way that restricts its normal movement. This connection, where one or both bony protrusions of the vertebra are attached to the pelvis, prevents the vertebra from bending freely as it would in a healthy spine.
Essentially, it's a false joint created by an atypical fusion or connection between bones, leading to restricted movement and potentially causing discomfort or other issues.
