Table 4.
Change in sacroiliac joint flexion-extension range of motion (°) as a result of reducing the number of implants
| Treatment | Implants (positions) | Superior implant ending point | Range of motion (°) | Motion increase (°) | % 3 Implant motion |
| Intact | - | -1 | 1.94 | - | - |
| Inline | 3 (S, M, I) | Mid-ala | 0.7 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-ala | 0.97 | 0.27 | 39 |
| Inline | 2 (S, -, I) | Mid-ala | 0.82 | 0.12 | 17 |
| Inline | 2 (-, M, I) | -1 | 0.91 | 0.21 | 30 |
| Inline | 1 (S, -, -) | Mid-ala | 1.36 | 0.66 | 94 |
| Inline | 1 (-, M, -) | -1 | 1.32 | 0.62 | 89 |
| Inline | 1 (-, -, I) | -1 | 1.25 | 0.55 | 79 |
| Inline | 3 (S, M, I) | Mid-sacrum | 0.63 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-sacrum | 0.76 | 0.13 | 21 |
| Inline | 2 (S, -, I) | Mid-sacrum | 0.69 | 0.06 | 10 |
| Inline | 1 (S, -, -) | Mid-sacrum | 1.21 | 0.58 | 92 |
| Transarticular | 3 (S, M, I) | Mid-ala | 0.59 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-ala | 0.81 | 0.22 | 37 |
| Transarticular | 2 (S, -, I) | Mid-ala | 0.69 | 0.1 | 17 |
| Transarticular | 2 (-, M, I) | -1 | 0.76 | 0.17 | 29 |
| Transarticular | 1 (S, -, -) | Mid-ala | 1.36 | 0.77 | 131 |
| Transarticular | 1 (-, M, -) | -1 | 1.11 | 0.52 | 88 |
| Transarticular | 1 (-, -, I) | -1 | 1.05 | 0.46 | 78 |
| Transarticular | 3 (S, M, I) | Mid-sacrum | 0.52 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-sacrum | 0.64 | 0.12 | 23 |
| Transarticular | 2 (S, -, I) | Mid-sacrum | 0.58 | 0.06 | 12 |
| Transarticular | 1 (S, -, -) | Mid-sacrum | 1.21 | 0.69 | 133 |
| Treatment | Implants (positions) | Superior implant ending point | % 3 Implant motion | Implants (positions) | Median (%) [range] |
| Inline | 2 (S, -, I) | Mid-ala | 17 | 2 (S, -, I) | 14.5% (10-17) |
| Inline | 2 (S, -, I) | Mid-sacrum | 10 | ||
| Transarticular | 2 (S, -, I) | Mid-ala | 17 | ||
| Transarticular | 2 (S, -, I) | Mid-sacrum | 12 | ||
| Inline | 2 (S, M, -) | Mid-ala | 39 | 2 (S, M, -) | 30% (21-39) |
| Inline | 2 (S, M, -) | Mid-sacrum | 21 | ||
| Transarticular | 2 (S, M, -) | Mid-ala | 37 | ||
| Transarticular | 2 (S, M, -) | Mid-sacrum | 23 | ||
| Inline | 2 (-, M, I) | -1 | 30 | 2 (-, M, I) | 29.5% (29-30) |
| Transarticular | 2 (-, M, I) | -1 | 29 | ||
| Inline | 1 (S, -, -) | Mid-ala | 94 | 1 (S, -, -) | 112.5% (92-133) |
| Inline | 1 (S, -, -) | Mid-sacrum | 92 | ||
| Transarticular | 1 (S, -, -) | Mid-ala | 131 | ||
| Transarticular | 1 (S, -, -) | Mid-sacrum | 133 | ||
| Inline | 1 (-, M, -) | -1 | 89 | 1 (-, M, -) | 88.5% (88-89) |
| Transarticular | 1 (-, M, -) | -1 | 88 | ||
| Inline | 1 (-, -, I) | -1 | 79 | 1 (-, -, I) | 78.5% (78-79) |
| Transarticular | 1 (-, -, I) | -1 | 78 | ||
1
Configuration does not include a superior implant. S: Superior; M: Middle; I: Inferior.