Patient characteristics.
| No. | Gender | Age at fusion surgery (yrs) | Age at non-fusion surgery (yrs) | Previous fusion segment | Pain free period after fusion (m) | Interval between fusion and non-fusion surgery (m) | Feature of ASP | Recent non-fusion segment | Pedicle-based dynamic stabilization system | Clinical ASP after non-fusion surgery | Radiologic ASP after non-fusion surgery |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | M | 49 | 59 | L3-4 | 72 | 120 | Stenosis at L4-5 DDD at L2-3, L4-5 | L4-5 | Dynesys | + | + |
| 2 | F | 60 | 67 | L4-5-S1 | Persistent pain | 84 | Stenosis & DDD at L3-4 | L3-4 | Dynesys | Persistent pain | + |
| 3 | F | 56 | 61 | L4-5-S1 | Persistent pain | 60 | Stenosis & DDD at L3-4 | L3-4 | Dynesys | Persistent pain | + |
| 4 | M | 63 | 68 | L4-5-S1 | 12 | 56 | Stenosis at L3-4 | L3-4 | Dynesys | - | - |
| 5 | F | 49 | 60 | L4-5 | 96 | 120 | Stenosis, DDD & SPL at L2-3-4 | L2-3-4-5 | Dynesys | Persistent pain | - |
| 6 | F | 56 | 61 | L3-4-5 | 36 | 60 | Stenosis at L2-3 | L2-3 | Dynesys | - | - |
| 7 | F | 61 | 63 | L4-5 | Persistent pain | 26 | Stenosis at L3-4-5 SPL at L4-5 | L3-4-5 | Dynesys | + | + |
| 8 | F | 48 | 59 | L4-5 | 48 | 120 | Stenosis & DDD at L3-4 | L3-4 | Dynesys | - | - |
| 9 | F | 62 | 70 | L4-5 | 82 | 94 | Stenosis & DDD at L3-4 | L3-4 | Dynesys | - | - |
| 10 | F | 51 | 57 | L4-5-S1 | 20 | 70 | Stenosis & DDD at L3-4 | L3-4 | Dynesys | - | - |
| 11 | F | 58 | 65 | L4-5-S1 | 36 | 82 | Stenosis at L1-2-3 | L1-2-3 | Dynesys | - | - |
| 12 | F | 67 | 69 | L4-5 | 20 | 22 | Stenosis & DDD at L2-3-4 | L2-3-4 | NFlex | - | + |
| 13 | F | 64 | 70 | L4-5-S1 | 12 | 60 | Stenosis at L3-4 | L3-4 | NFlex | + | - |
| 14 | F | 43 | 46 | L3-4 | Persistent pain | 25 | Stenosis & DDD at L4-5 | L4-5 | NFlex | + | - |
| 15 | F | 56 | 57 | L2-3 | Persistent pain | 6 | Stenosis at L4-5 | L4-5 | NFlex | - | - |
DDD: degenerative disc disease; SPL: spondylolisthesis; ‘+’: developed, ‘-’: absent.