Characteristics of included studies
| Study | Methodology | Participants | Intervention | Outcome |
|---|---|---|---|---|
| Suk et al.10 (Spine 1997) | Retrospective with 3.3-y FU | 76 patients, aged 30-60 y, with spondylolytic spondylolisthesis | Group 1: 40 patients with PF (1988-1991) Group 2: 36 patients with PIF + PF (1991-1993) | Kirkaldy-Willis criteria |
| Madan and Boeree9 (Spine 2002) | Retrospective with 2.1-y FU | 44 patients (27 M and 17 F), aged 24-67 y, with isthmic spondylolisthesis | Group 1: 21 patients with PIF + PF Group 2: 21 patients with PF | Oswestry Disability Index, Zung Depression Scale, MSPQ, VAS, core set, and pain drwoing |
| Lidar et al.8 (Surg Neurol 2005) | Retrospective with 2-y FU | 100 patients (60 M and 40 F), aged 42-50 y, with DDD (48), recurrent disc herniation (22), spondylolisthesis (16), or spinal stenosis (14) | Group 1: 45 patients with PIF + non-instrumented fusion Group 2: 55 patients with PF with instrumentation | Prolo Economic and Functional Scale, complications, and fusion rate |
| Dehoux et al.6 (Acta Orthop Belg 2004) | Prospective nonrandomized with 6-y FU | 52 patients, aged 14-63 y, with isthmic spondylolisthesis | Group 1: 27 patients with PIF Group 2: 25 patients with PF | Modified Beaujon score and fusion rate |
| La Rosa et al.7 (J Neurosurg 2003) | Retrospective with 2-y FU | 35 patients (21 M and 14 F), aged 32-74 y, with isthmic spondylolisthesis | Group 1: 17 patients with PIF (1999-2000) Group 2: 18 patients with PF (1997-1999) | Prolo Economic and Functional Scale |
Abbreviations: DDD, degenerative disc disease; F, female; FU, follow-up; M, male; MSPQ, Modified Somatic Perception Questionnaire; VAS, visual analog scale.