LSO
Pronunciation: L-S-O (spell out)
Also written as: LSO — Lumbosacral Orthosis
Lumbosacral Orthosis; a device that encompasses the lumbar spine and sacral region to restrict motion or provide support.
Full Definition
An LSO (Lumbosacral Orthosis) is an external support device that spans from the lower thoracic or lumbar region to the sacrum, used for conditions such as lumbar disc herniation, post-surgical stabilisation, or chronic low back pain. In editorial contexts, 'LSO' must be distinguished from 'TLSO,' which extends into the thoracic region. The abbreviation should be defined on first use in any document and should not be pluralised as 'LSOs' in formal clinical writing without style-guide sanction. HCPCS codes specific to the LSO must correspond exactly to the documented device type—rigid, semi-rigid, or soft.
Usage
Usage note: Always define on first use. Do not use 'LSO' as a generic synonym for any low-back support; it has a specific anatomical scope.
In Context
- "The claim was denied because the LSO billed did not match the rigid device described in the clinical notes." — Insurance denial letter
- "On first reference, expand LSO to 'lumbosacral orthosis' before using the abbreviation throughout the report." — Editorial style guide