Table 2.
Peri-operative imaging and intra-operative corrections
| No-3D n (%) |
3D n (%) |
Risk difference % [95% CI] |
Risk ratio [95% CI] |
|
|---|---|---|---|---|
| Preoperative imaging | 0.6 [−0.9 to 2.1] | 1.0 [0.8 to 1.2] | ||
| X-ray | 1 (1) | 1 (1) | 0.1 [−2.4 to 2.6] | 1.1 [0.1 to 17.8] |
| CT scan | 45 (39) | 47 (45) | 6.7 [−6.2 to 19.7] | 1.2 [0.9 to 1.6] |
| X-ray & CT scan | 71 (61) | 55 (53) | −7.8 [−20.9 to 5.3] | 0.9 [0.7 to 1.1] |
| Other | 0 (0) | 1 (1) | 1.0 [−0.9 to 2.8] | – |
| Type of preoperative X-ray | ||||
| AP & lateral | 92 (99) | 85 (97) | −2.3 [−6.7 to 2.0] | 1.0 [0.9 to 1.0] |
| Axial | 55 (53) | 50 (52) | −0.8 [−14.7 to 13.0] | 1.0 [0.8 to 1.3] |
| Broden | 35 (34) | 19 (20) | −13.9 [−25.9 to −1.8] | 0.6 [0.4 to 1.0] |
| Overall corrections performed | 61 (53) | 70 (69) | 16.3 [3.5 to 29.1] | 1.3 [1.1 to 1.6] |
| Corrections performed after 2D-imaging | 61 (53) | 38 (38) | −15.4 [−28.6 to −2.3] | 0.7 [0.5 to 1.0] |
| Number of corrections after 2D-imaging | −3.4 [−6.6 to −0.3] | 1.0 [0.8 to 1.2] | ||
| 0 | 54 (47) | 63 (62) | 15.4 [2.3 to 28.55] | 1.3 [1.0 to 1.7] |
| 1 | 39 (34) | 29 (29) | −5.2 [−17.6 to 7.2] | 0.8 [0.6 to 1.3] |
| 2 | 17 (15) | 9 (9) | −5.9 [−14.4 to 2.7] | 0.6 [0.3 to 1.3] |
| 3 | 5 (4) | 0 (0) | −4.3 [−8.1 to −0.6] | – |
| Type of correction after 2D-imaging | −3.5 [−21.0 to 14.0] | 0.9 [0.7 to 1.3] | ||
| Reduction | 39 (43) | 22 (47) | ||
| Implant position | 51 (57) | 25 (53) | ||
| Year 3D-imaging performed | 54.0 [43.6–64.5] | 5.0 [2.9–8.7] | ||
| Before 2007 | 78 (87) | 12 (13) | ||
| After 2007 | 46 (33) | 95 (67) | ||
| Number of 3D scans | ||||
| 1 | – | 90 (84) | ||
| 2 | – | 16 (15) | ||
| 3 | – | 1 (1) | ||
| Number of corrections after 3D-imaging |
||||
| 0 | – | 48 (47) | ||
| 1 | – | 36 (35) | ||
| 2 | – | 13 (13) | ||
| 3 | 4 (4) | |||
| 4 | 0 (0) | |||
| 5 | – | 1 (1) | ||
| Timing 3D scan | ||||
| Before reduction & hardware implantation |
– | 0 (0) | ||
| After reduction | – | 12 (10) | ||
| After reduction & hardware implantation |
– | 113 (90) | ||
| Type of correction after 3D-imaging | ||||
| Reduction | – | 2 (4) | ||
| Implant position | – | 51 (96) | ||
| Postoperative imaging | ||||
| X-ray | 118 (98) | 102 (95) | −2.2 [−7.1 to 2.7] | 1.0 [0.9 to 1.0] |
| CT scan | 0 (0) | 0 (0) | – | – |
| X-ray & CT scan | 3 (3) | 5 (5) | 2.2 [−2.7 to 7.0] | 1.9 [0.5 to 7.7] |
| Other | 0 (0) | 0 (0) | – | – |
| Type of postoperative X-ray | ||||
| AP & lateral | 118 (100) | 107 (100) | – | – |
| Axial | 89 (75) | 86 (80) | 5.0 [−5.9 to 15.8] | 1.1 [0.9 to 1.2] |
| Broden | 37 (31) | 37 (35) | 3.2 [−9.1 to 15.5] | 1.1 [0.8 to 1.6] |
Bold values indicate a significant difference between the groups
CI confidence interval