What Multilevel Facet Arthropathy Means
Multilevel facet arthropathy of the lumbar spine refers to degenerative osteoarthritis affecting the facet joints (zygapophysial joints) at multiple spinal levels—the small synovial joints between adjacent vertebrae that allow spinal movement. This is an extremely common age-related finding that represents wear-and-tear changes in these joints.
Understanding the Condition
What Are Facet Joints?
The facet joints are the only true synovial joints between vertebrae in the lumbar spine, located in the posterior (back) aspect of the spinal column 1. They guide and limit spinal motion while bearing significant mechanical loads during movement.
Prevalence and Natural History
Facet arthropathy is nearly universal in adults:
- 57% of people in their 20s already show facet arthropathy 2
- 82% in their 30s
- 93% in their 40s
- 97% in their 50s
- 100% of people over 60 have some degree of facet arthropathy 2
The L4-L5 level shows the highest prevalence and severity, followed by L3-L4, L2-L3, L5-S1, and L1-L2 2. Men demonstrate greater prevalence and severity than women at all levels.
What "Multilevel" Means
When your imaging report states "multilevel," it indicates arthropathy is present at two or more adjacent or non-adjacent spinal levels (e.g., L3-L4, L4-L5, and L5-S1 simultaneously). This is common given the high overall prevalence of the condition.
Clinical Significance
The Critical Caveat
The presence of facet arthropathy on imaging does NOT automatically mean it is causing your pain. This is perhaps the most important point to understand:
- Facet arthropathy is present in the majority of asymptomatic adults 2
- No physical examination findings or radiographic features reliably correlate with facet-mediated pain 3
- Pain patterns overlap considerably between different lumbar levels 3
When Facet Arthropathy May Cause Pain
Facet-mediated pain accounts for chronic low back pain in only 9-42% of patients with degenerative lumbar disease 3. Typical pain patterns include:
- Lower facet joints (L4-L5, L5-S1): Pain referred to groin and deep posterior thigh
- Upper facet joints (L1-L2, L2-L3, L3-L4): Pain in flank, hip, and upper lateral thigh
- Pain below the knee is highly questionable as facet-mediated 3
Diagnostic Approach
The only reliable method to determine if facet arthropathy is actually causing your pain is through diagnostic facet blocks—injections of anesthetic into or around the facet joints 3, 4. The double-block technique (using two different anesthetics on separate occasions with different durations of action) is considered most reliable, though rarely performed in routine practice 3.
Imaging Findings
Facet arthropathy on CT or MRI may show:
- Joint space narrowing
- Osteophytes (bone spurs) and hypertrophy
- Subchondral cysts
- Erosions
- Joint effusion (fluid)
- Bone marrow edema
- Soft tissue edema
Important limitation: CT is more reliable than MRI for grading facet arthropathy severity, though even CT shows only moderate interobserver agreement 5, 6. This means different radiologists may grade the same findings differently.
Bottom Line for Patients
Having multilevel facet arthropathy on your imaging report is an extremely common, age-related finding that may or may not be the source of your symptoms. It should not cause alarm, as it is present in the vast majority of adults. The key question is whether these degenerative changes are actually generating your pain, which cannot be determined from imaging alone and requires clinical correlation with your symptoms and potentially diagnostic injections if conservative management fails.