Table 5.
Change in sacroiliac joint lateral bending 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 | 0.66 | - | - |
| Inline | 3 (S, M, I) | Mid-ala | 0.45 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-ala | 0.5 | 0.05 | 11 |
| Inline | 2 (S, -, I) | Mid-ala | 0.47 | 0.02 | 4 |
| Inline | 2 (-, M, I) | -1 | 0.53 | 0.08 | 18 |
| Inline | 1 (S, -, -) | Mid-ala | 0.58 | 0.13 | 29 |
| Inline | 1 (-, M, -) | -1 | 0.65 | 0.2 | 44 |
| Inline | 1 (-, -, I) | -1 | 0.69 | 0.24 | 53 |
| Inline | 3 (S, M, I) | Mid-sacrum | 0.41 | Reference configuration | |
| Inline | 2 (S, M, -) | Mid-sacrum | 0.45 | 0.04 | 10 |
| Inline | 2 (S, -, I) | Mid-sacrum | 0.43 | 0.02 | 5 |
| Inline | 1 (S, -, -) | Mid-sacrum | 0.58 | 0.17 | 41 |
| Transarticular | 3 (S, M, I) | Mid-ala | 0.41 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-ala | 0.45 | 0.04 | 10 |
| Transarticular | 2 (S, -, I) | Mid-ala | 0.42 | 0.01 | 2 |
| Transarticular | 2 (-, M, I) | -1 | 0.47 | 0.06 | 15 |
| Transarticular | 1 (S, -, -) | Mid-ala | 0.58 | 0.17 | 41 |
| Transarticular | 1 (-, M, -) | -1 | 0.6 | 0.19 | 46 |
| Transarticular | 1 (-, -, I) | -1 | 0.62 | 0.21 | 51 |
| Transarticular | 3 (S, M, I) | Mid-sacrum | 0.38 | Reference configuration | |
| Transarticular | 2 (S, M, -) | Mid-sacrum | 0.41 | 0.03 | 8 |
| Transarticular | 2 (S, -, I) | Mid-sacrum | 0.39 | 0.01 | 3 |
| Transarticular | 1 (S, -, -) | Mid-sacrum | 0.58 | 0.2 | 53 |
| Treatment | Implants (positions) | Superior implant ending point | % 3 Implant motion | Implants (positions) | Median (%) [range] |
| Inline | 2 (S, -, I) | Mid-ala | 4 | 2 (S, -, I) | 3.5% (2-5) |
| Inline | 2 (S, -, I) | Mid-sacrum | 5 | ||
| Transarticular | 2 (S, -, I) | Mid-ala | 2 | ||
| Transarticular | 2 (S, -, I) | Mid-sacrum | 3 | ||
| Inline | 2 (S, M, -) | Mid-ala | 11 | 2 (S, M, -) | 10% (8-11) |
| Inline | 2 (S, M, -) | Mid-sacrum | 10 | ||
| Transarticular | 2 (S, M, -) | Mid-ala | 10 | ||
| Transarticular | 2 (S, M, -) | Mid-sacrum | 8 | ||
| Inline | 2 (-, M, I) | -1 | 18 | 2 (-, M, I) | 16.5% (15-18) |
| Transarticular | 2 (-, M, I) | -1 | 15 | ||
| Inline | 1 (S, -, -) | Mid-ala | 29 | 1 (S, -, -) | 41% (29-53) |
| Inline | 1 (S, -, -) | Mid-sacrum | 41 | ||
| Transarticular | 1 (S, -, -) | Mid-ala | 41 | ||
| Transarticular | 1 (S, -, -) | Mid-sacrum | 53 | ||
| Inline | 1 (-, M, -) | -1 | 44 | 1 (-, M, -) | 45% (44-46) |
| Transarticular | 1 (-, M, -) | -1 | 46 | ||
| Inline | 1 (-, -, I) | -1 | 53 | 1 (-, -, I) | 52% (51-53) |
| Transarticular | 1 (-, -, I) | -1 | 51 | ||
1
Configuration does not include a superior implant. S: Superior; M: Middle; I: Inferior.