What is Anterolisthesis of the Lumbar Spine in a 63-Year-Old Female?
Anterolisthesis is the forward slippage of one vertebra relative to the vertebra below it, most commonly occurring at L4-L5 or L5-S1 in the lumbar spine, and in a 63-year-old woman, this is typically degenerative in nature (Wiltse Type III) caused by progressive disc degeneration and facet joint changes.
Definition and Pathophysiology
Anterolisthesis represents anterior displacement of a vertebral body, measured in millimeters or as a percentage of vertebral body width. In your patient's demographic:
- Degenerative anterolisthesis is the result of progressive intervertebral disc degeneration combined with facet joint arthrosis that leads to sagittalization (reorientation) of the facet joints 1
- This destabilizes the vertebral segment, allowing anterior translation
- The condition predominantly affects women with a 5:1 ratio compared to men 1
- Peak prevalence occurs in the 60-64 age group, where 28.57% of women are affected 2
Prevalence and Location
The epidemiological data for your patient's age group shows:
- Overall prevalence of anterolisthesis in middle-aged populations ranges from 6.99% to 58.3% depending on the population studied 3, 4, 2
- L4-L5 is the most commonly affected level, followed by L5-S1 2, 1
- The slip rarely exceeds 30% (Grade I) in degenerative cases 1
- Most cases (90%) involve a single vertebral level 3
Clinical Significance
The presence of anterolisthesis does not automatically correlate with symptoms or functional impairment. This is a critical distinction:
- Anterolisthesis of ≥3mm is not associated with increased back pain or functional disability in most elderly women 3
- The severity of symptoms does not correlate with the degree of slip 1
- However, when symptomatic, the cardinal manifestation is lumbar pain with or without radicular symptoms 1
- Neurogenic claudication occurs in 75% of symptomatic patients, caused by nerve root compression and blood hypoperfusion, manifesting as lower extremity pain with variable walking distances 1
Grading and Measurement
Anterolisthesis is graded by the percentage of vertebral body slippage:
- Grade I: <25% (95.71% of cases) 2
- Grade II: 25-50% (4.29% of cases) 2
- Grade III and IV: Rare in degenerative cases 2
Slippage ≥2mm is considered clinically measurable, though high-grade slip (≥4mm) may be associated with worse neurological recovery if surgical intervention becomes necessary 5.
Diagnostic Approach
For a 63-year-old woman with suspected anterolisthesis, obtain:
- Standing lateral lumbar radiographs (essential for weight-bearing assessment)
- Flexion-extension views to assess segmental instability (>5mm translation indicates instability) 6
- MRI lumbar spine if symptoms are present and surgical candidacy is being considered 7
- Measure specific parameters: slip distance in millimeters, disc height, and assess for concomitant stenosis
Management Implications
Conservative treatment is first-line therapy regardless of slip grade 1:
- Physical therapy focusing on core stabilization
- Analgesics and anti-inflammatories
- Activity modification
- Minimum 6 weeks of conservative management before considering imaging for surgical planning 7
Surgical consideration becomes relevant when:
- Symptoms persist despite 6 weeks of optimal conservative management 7
- Concomitant stenosis with spondylolisthesis is present—this combination has strong evidence (Grade B) supporting decompression with fusion 8, 9
- The SPORT trial provides Level II evidence that surgical patients with stenosis and spondylolisthesis experience superior outcomes at every time point for at least 4 years 9
Key Clinical Pitfall
Do not assume anterolisthesis is the pain generator. Many elderly women have radiographic anterolisthesis without symptoms 3. The decision to attribute symptoms to anterolisthesis requires correlation with clinical presentation, particularly the presence of neurogenic claudication or radiculopathy, and exclusion of other pain sources.