posterior longitudinal ligament
Spinal ligament running along the posterior aspect of vertebral bodies within the spinal canal.
Full Definition
The posterior longitudinal ligament (PLL) is a continuous fibrous band that extends along the posterior surface of the vertebral bodies within the spinal canal, from the axis (C2) to the sacrum. This ligament helps maintain spinal stability and prevents excessive flexion of the spine. In pathological conditions, the PLL can become ossified (particularly common in the cervical spine among certain populations), leading to spinal canal narrowing and neurological compression. During anterior spinal approaches, the PLL often needs to be removed or sectioned to access the spinal canal for decompression procedures.
Usage
Usage note: Commonly abbreviated as PLL in clinical documentation.
In Context
- "The posterior longitudinal ligament was sectioned to achieve adequate decompression." — Operative technique note
- "Ossification of the posterior longitudinal ligament contributed to cervical myelopathy." — Diagnostic assessment