Proportion of studies noted to be prospective.
| Studies Reporting Pain Scores | Studies Reporting Oswestry Disability Index | |||
| Procedure | N/Total | % | N/Total | % |
| LTI | 9/43 | 21% | 8/32 | 25% |
| PLTI | 0/6 | 0% | 0/2 | 0% |
| PI | 3/8 | 38% | 2/3 | 67% |
| Total | 12/57 | 21% | 10/37 | 27% |
Abbreviations: LTI, lateral transiliac; ODI, Oswestry Disability Index; PI, posterior interpositional; PLTI, posterolateral transiliac.