Lumbar Decompression and Instrumented Fusion
Laminectomy is the removal of the lamina of the vertebra for purposes of decompression of the spinal canal.
It is combined with variable amounts of bone removal from the posterior elements such as the facet joints to adequately decompress the thecal sac and the nerve roots.
The ligamentum flavum which runs from the anterior aspect of the cephalad lamina to the superior aspect of the caudal lamina is also usually resected.
Laminectomy may be done at one or more levels. It is combined with instrumented posterolateral fusion in cases where there is instability of the spinal column as a result of the pathology being treated or where instability will be produced due to the amount of bone that needs to be removed for adequate decompression.