Table 3. Demographic and Surgical Data between the Two Surgical Groups.
| Overall | Minimally invasive group | Open group |
|---|---|---|
| Number of patients | 363 | 344 |
| Age (yr) | 57.1±8.2 | 58.1±6.6 |
| Gender, male (%) | 122 (33.6) | 127 (36.9) |
| Diagnosis | ||
| Spondylolisthesis (low-grade) | 188 | 169 |
| Degenerative | 142 | 123 |
| sthmic | 43 | 43 |
| Postsurgical | 3 | 3 |
| Other spondylosis | 103 | 103 |
| Degenerative disc disease | 15 | 11 |
| Lumbar disc herniation | 1 | 3 |
| Spinal stenosis | 18 | 14 |
| Foraminal stenosis | 16 | 20 |
| Spinal stenosis with segmental instability | 29 | 27 |
| Recurrent lumbar disc herniation | 7 | 8 |
| Postsurgical foraminal stenosis | 10 | 9 |
| Postsurgical segmental instability | 5 | 7 |
| Degenerative scoliosis | 1 | 4 |
| Iatrogenic spondylolysis | 1 | 0 |
| Number of each separate diagnosis NR | 72 | 72 |
| Fusion modalities | ||
| TLIF | 251 | 248 |
| Single-level | 204 | 206 |
| Two-level | 47 | 42 |
| PLIF | 69 | 59 |
| Single-level | 61 | 54 |
| Multi-level | 8 | 5 |
| PLF | ||
| Single-level | 43 | 37 |
| Fusion level | ||
| Single-level | 308 | 297 |
| T11–12 | 0 | 1 |
| L2–3 | 1 | 0 |
| L3–4 | 19 | 15 |
| L4–5 | 156 | 151 |
| L5–S1 | 83 | 86 |
| Level NR | 49 | 44 |
| Two-level | 47 | 42 |
| L3–L5 | 13 | 14 |
| L4–S1 | 31 | 24 |
| Level NR | 3 | 4 |
| Multi-level | ||
| Level NR | 8 | 5 |
| Follow-up periods | 22.2±6.8 | 24.1±7.6 |
TLIF, transforaminal lumbar interbody fusion; PLIF, posterior lumbar interbody fusion; PLF, posterolateral fusion; NR, not reported.
The differences of all baseline data were not significant. p>0.05.