A recent retrospective study highlights a significant link between facet joint osteoarthritis (FJOA) and multifidus fat infiltration in patients with lumbar spondylolisthesis. Researchers evaluated 243 patients across two specialized spine centers to understand how joint degeneration affects adjacent musculature. The findings suggest that FJOA serves as an independent predictor of muscle quality degradation, which may further complicate spinal stability and patient outcomes.

Lumbar spondylolisthesis often involves a complex interplay between vertebral slippage and degenerative changes in the facet joints. As these joints undergo osteoarthritic changes, they potentially trigger mechanical stress and inflammatory pathways that impact the multifidus muscle. The study quantified muscle parameters using ImageJ software, specifically focusing on the functional cross-sectional area and the extent of fatty replacement within the muscle fibers.

Identifying Multifidus Fat Infiltration in Spondylolisthesis

Specifically, the data showed that multifidus fat infiltration increased significantly as FJOA severity progressed, particularly at the L2/3, L3/4, and L5/S1 levels. Even after adjusting for age, sex, and Body Mass Index (BMI), multivariate regression analysis confirmed that FJOA remains a robust predictor of fatty atrophy. This indicates that joint health and muscle integrity are deeply interconnected within the lumbar motion segment.

Moreover, clinicians should consider that managing facet joint degeneration might be essential for preserving paraspinal muscle function. Because the multifidus muscle provides critical dynamic stability to the spine, its replacement by adipose tissue could lead to a vicious cycle of instability and further joint wear. Consequently, early identification of these changes through imaging may guide more effective rehabilitation strategies for chronic back pain patients.

Frequently Asked Questions

How is facet joint osteoarthritis graded in these studies?

Researchers typically use Weishaupt's criteria, which grade FJOA from 0 to 3 based on joint space narrowing, osteophyte formation, and subchondral erosions observed on CT or MRI scans.

Why is the multifidus muscle specifically affected by joint degeneration?

The multifidus muscle has a unique segmental innervation and anatomical proximity to the facet joints. Inflammatory mediators from an osteoarthritic joint can penetrate local tissues, while mechanical instability alters the muscle's workload, leading to atrophy and fat replacement.

Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice or a professional relationship. Always seek the advice of a qualified healthcare provider for any medical condition. Refer to the latest local and national guidelines for clinical practice.

References

• Wang S et al. Relationship between facet joint osteoarthritis and multifidus fat infiltration in patients with lumbar spondylolisthesis. Sci Rep. 2026 Apr 11. doi: 10.1038/s41598-026-46090-z. PMID: 41965923.


• Guven AE et al. Relationship between facet joint osteoarthritis and lumbar paraspinal muscle atrophy - a cross-sectional study. ORS Annual Meeting. 2024.


• Kalichman L et al. Correlation of the Features of the Lumbar Multifidus Muscle With Facet Joint Osteoarthritis. Orthopedics. 2017; 40(5):e793-e800.