Table 6.
Change in sacroiliac joint axial rotation 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 | 1.11 | - | - |
| Inline | 3 (S, M, I) | Mid-ala | 0.41 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-ala | 0.49 | 0.08 | 20 |
| Inline | 2 (S, -, I) | Mid-ala | 0.44 | 0.03 | 7 |
| Inline | 2 (-, M, I) | 1 | 0.55 | 0.14 | 34 |
| Inline | 1 (S, -, -) | Mid-ala | 0.67 | 0.26 | 63 |
| Inline | 1 (-, M, -) | 1 | 0.73 | 0.32 | 78 |
| Inline | 1 (-, -, I) | 1 | 0.79 | 0.38 | 93 |
| Inline | 3 (S, M, I) | Mid-sacrum | 0.38 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-sacrum | 0.43 | 0.05 | 13 |
| Inline | 2 (S, -, I) | Mid-sacrum | 0.4 | 0.02 | 5 |
| Inline | 1 (S, -, -) | Mid-sacrum | 0.61 | 0.23 | 61 |
| Transarticular | 3 (S, M, I) | Mid-ala | 0.34 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-ala | 0.4 | 0.06 | 18 |
| Transarticular | 2 (S, -, I) | Mid-ala | 0.36 | 0.02 | 6 |
| Transarticular | 2 (-, M, I) | 1 | 0.46 | 0.12 | 35 |
| Transarticular | 1 (S, -, -) | Mid-ala | 0.67 | 0.33 | 97 |
| Transarticular | 1 (-, M, -) | 1 | 0.7 | 0.36 | 106 |
| Transarticular | 1 (-, -, I) | 1 | 0.73 | 0.39 | 115 |
| Transarticular | 3 (S, M, I) | Mid-sacrum | 0.31 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-sacrum | 0.35 | 0.04 | 13 |
| Transarticular | 2 (S, -, I) | Mid-sacrum | 0.32 | 0.01 | 3 |
| Transarticular | 1 (S, -, -) | Mid-sacrum | 0.61 | 0.3 | 97 |
| Treatment | Implants (positions) | Superior implant ending point | % 3 Implant motion | Implants (positions) | Median (%) [range] |
| Inline | 2 (S, -, I) | Mid-ala | 7 | 2 (S, -, I) | 5.5% (3-7) |
| Inline | 2 (S, -, I) | Mid-sacrum | 5 | ||
| Transarticular | 2 (S, -, I) | Mid-ala | 6 | ||
| Transarticular | 2 (S, -, I) | Mid-sacrum | 3 | ||
| Inline | 2 (S, M, -) | Mid-ala | 20 | 2 (S, M, -) | 15.5% (13-20) |
| Inline | 2 (S, M, -) | Mid-sacrum | 13 | ||
| Transarticular | 2 (S, M, -) | Mid-ala | 18 | ||
| Transarticular | 2 (S, M, -) | Mid-sacrum | 13 | ||
| Inline | 2 (-, M, I) | 1 | 34 | 2 (-, M, I) | 34.5% (34-35) |
| Transarticular | 2 (-, M, I) | 1 | 35 | ||
| Inline | 1 (S, -, -) | Mid-ala | 63 | 1 (S, -, -) | 80% (61-97) |
| Inline | 1 (S, -, -) | Mid-sacrum | 61 | ||
| Transarticular | 1 (S, -, -) | Mid-ala | 97 | ||
| Transarticular | 1 (S, -, -) | Mid-sacrum | 97 | ||
| Inline | 1 (-, M, -) | 1 | 78 | 1 (-, M, -) | 92% (78-106) |
| Transarticular | 1 (-, M, -) | 1 | 106 | ||
| Inline | 1 (-, -, I) | 1 | 93 | 1 (-, -, I) | 104% (93-115) |
| Transarticular | 1 (-, -, I) | 1 | 115 | ||
1
Configuration does not include a superior implant. S: Superior; M: Middle; I: Inferior.