Ossification: process of changing into a bone or bone-like substance
Posterior: anatomical term meaning “further back in position”
Longitudinal: anatomical term that means “traveling long-ways”
Ligament: soft tissue that connects and supports the bones of joints
Ossification of the posterior longitudinal ligament (OPLL) is a condition in which a flexible structure known as the posterior longitudinal ligament becomes thicker and less flexible.
