Demographics and clinical data of the patients.
| Demographics | N = 11 |
| Gender, men:women | 6:5 (54.55%:45.45%) |
| Age, y, mean ± SD | 62.45 ± 10.65 |
| Follow-up period, mo, mean ± SD | 22.64 ± 15.40 |
| Spondylolysis alone | 5 (45.45%) |
| L3-L4 and L4-L5 spondylolysis | 1 |
| L5-S1 spondylolysis | 4 |
| Spondylolysis with spondylolisthesis | 6 (54.54%) |
| Grade 1 spondylolisthesis L3-L4 | 1 |
| Grade 1 spondylolisthesis L4-L5 | 1 |
| Grade 1 spondylolisthesis L5-S1 | 3 |
| Grade 2 spondylolysis L5-S1 | 1 |