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Five-year preservation probability and median preservation expectancy
| Factor | 5-year preservation probability (%) | Median preservation expectancy (years) |
|---|---|---|
| Severe intermittent claudication | 38.9 | 4.1 |
| Mild intermittent claudication | 81.1 | Over 10 |
| Cauda equina and mixed type of LSS | 52.4 | 5.8 |
| Radicular type of LSS | 76.9 | 9.5 |
| Muscle weakness | 63.6 | 5.8 |
| No muscle weakness | 71.1 | Over 10 |
| Block on myelography | 60.0 | 5.8 |
| No block on myelography | 74.3 | 9.5 |
