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Proportion of Spondylolysis Occurring at Specific Lumbar Levels.a
| Lumbar Level of Spondylolysis | Incidence (%) |
|---|---|
| L1 | 0-5 |
| L2 | 0-5 |
| L3 | 0-5 |
| L4 | 5-23 |
| L5 | 71-95 |
a The majority of lumbar spondylolysis occurs at L5 (71%-95%) followed by L4 (5%-23%). Spondylolysis at L1-L3 is rare (0%-5% each).
