Table 3.
CT-based and X-ray image projection angles automatically computed for varying approaches on non-instrumented, intact cadavers with clinically relevant exposures
| Trial number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F-CE | |||||||||||||||||
| Preop | 35.6 | 36.2 | 38.0 | 44.5 | 34.5 | 38.0 | 43.2 | 42.5 | 30.1 | 40.5 | 35.1 | 34.7 | 37.6 | 32.1 | 37.5 | 40.2 | 39.6 |
| BGS | 49.5 | 16.3 | 58.7 | 52.0 | 52.5 | 51.6 | 54.3 | 39.0 | 32.5 | 46.1 | 37.5 | 37.5 | 40.6 | 51.2 | 44.2 | 38.8 | 43.3 |
| PCR | 34.9 | 20.9 | 64.0 | 60.7 | 50.8 | 50.9 | 58.8 | 42.1 | 30.0 | 45.7 | 36.8 | 36.3 | 45.8 | 45.6 | 41.9 | 40.8 | 43.3 |
| Postop | 43.3 | 38.5 | 69.1 | 63.1 | 62.9 | 64.4 | 57.7 | 61.2 | 28.8 | 53.0 | 40.0 | 42.7 | 46.5 | 56.3 | 47.5 | 45.0 | 53.9 |
| F-AC | |||||||||||||||||
| Preop | 5.6 | 6.8 | −5.8 | −7.9 | 0.6 | −6.4 | 0.6 | −4.2 | 15.4 | −3.1 | 12.0 | 14.9 | 2.4 | 7.1 | −5.6 | −0.9 | −2.1 |
| BGS | −2.6 | 30.6 | −27.1 | −15.8 | −11.7 | −15.5 | −12.2 | −0.2 | 13.1 | −6.3 | 10.0 | 11.0 | −7.2 | −5.3 | −6.1 | 0.0 | −5.3 |
| PCR | 8.2 | 25.0 | −32.1 | −22.7 | −10.9 | −13.3 | −15.5 | −1.7 | 15.3 | −5.6 | 10.8 | 12.0 | −9.7 | −6.1 | −12.5 | −1.7 | −3.3 |
| Postop | 2.4 | 19.6 | −32.3 | −21.1 | −7.5 | – | −15.4 | −6.2 | 12.5 | −7.9 | 7.9 | 10.7 | −10.9 | −11.5 | −15.7 | 1.3 | −5.9 |
| S-AC | |||||||||||||||||
| Preop | −35.1 | −39.2 | −28.9 | −33.3 | −34.1 | −32.0 | −38.0 | −40.4 | −32.5 | −34.5 | −38.8 | −35.4 | −38.0 | −33.4 | 0.0 | 0.0 | −29.9 |
| BGS | −47.7 | −65.4 | – | −36.4 | −40.5 | −36.6 | −44.7 | −54.3 | −33.4 | −37.7 | −42.4 | −37.9 | −52.5 | −50.5 | 0.0 | 0.0 | −32.2 |
| PCR | −40.8 | −52.0 | – | −37.3 | −39.1 | −37.8 | −46.2 | −49.5 | −33.2 | −38.3 | −41.7 | −38.1 | −47.7 | −48.3 | 0.0 | 0.0 | −31.2 |
| Postop | −43.8 | −78.4 | −36.2 | −35.6 | −44.1 | −60.7 | −44.3 | −69.5 | −33.9 | −35.8 | −42.0 | −39.4 | −45.3 | −52.6 | 0.0 | 0.0 | −38.4 |
| AcetAv | |||||||||||||||||
| Preop | 15.1 | 13.8 | 21.6 | 16.9 | 23.0 | 21.1 | 9.3 | 9.7 | 18.7 | 22.8 | 7.9 | 13.0 | 12.2 | 10.9 | 15.0 | 20.8 | 19.7 |
| BGS | −17.8 | −20.7 | 18.4 | 15.3 | 17.8 | 18.5 | −5.5 | −25.4 | 21.0 | 18.8 | 0.9 | 6.0 | −18.6 | −31.2 | −11.2 | 21.6 | 17.6 |
| PCR | 4.3 | −13.3 | 24.4 | 9.2 | 20.7 | 14.7 | −16.4 | −16.6 | 16.8 | 18.2 | 1.3 | 5.7 | −9.2 | −15.6 | 4.4 | 22.9 | 13.5 |
| Postop | 0.8 | −14.6 | 25.9 | 10.2 | 18.8 | 16.3 | −22.9 | −17.7 | 16.6 | 17.3 | 1.7 | 4.7 | −7.1 | −19.6 | 0.8 | 21.4 | 14.5 |
| CE | |||||||||||||||||
| Preop | 35.6 | 38.4 | 43.3 | 46.3 | 34.5 | 38.5 | 46.2 | 42.7 | 44.3 | 45.6 | 35.2 | 34.6 | 40.2 | 33.6 | 37.6 | 41.0 | 39.2 |
| BGS | 55.0 | 51.8 | 63.4 | 54.0 | 53.5 | 52.1 | 60.3 | 62.0 | 51.4 | 46.8 | 39.7 | 37.4 | 57.2 | 55.5 | 46.7 | 38.7 | 43.1 |
| PCR | 38.5 | 51.5 | 67.4 | 62.1 | 51.4 | 51.4 | 69.8 | 55.9 | 42.5 | 45.8 | 39.9 | 36.3 | 55.7 | 49.9 | 42.3 | 41.0 | 43.2 |
| Postop | 44.8 | 66.4 | 71.6 | 67.7 | 63.3 | 65.4 | 65.5 | 60.2 | 29.1 | 53.6 | 40.4 | 42.3 | 56.9 | 58.6 | 47.3 | 45.5 | 54.1 |
| AC | |||||||||||||||||
| Preop | 5.7 | 3.7 | −9.3 | −8.7 | −0.8 | −7.4 | −1.6 | −4.0 | 0.1 | −10.3 | 11.1 | 13.0 | −1.6 | 6.0 | −7.7 | −2.5 | −1.7 |
| BGS | −9.1 | 5.5 | −29.2 | −16.9 | −17.2 | −19.1 | −16.3 | −17.9 | −4.4 | −10.1 | 7.3 | 9.5 | −18.1 | −11.6 | −16.3 | −1.4 | −5.3 |
| PCR | 3.9 | 2.0 | −34.5 | −23.6 | −15.5 | −18.2 | −21.7 | −14.3 | 0.5 | −8.0 | 6.9 | 10.7 | −15.4 | −9.3 | −13.0 | −3.4 | −4.5 |
| Postop | 0.1 | −3.2 | −33.4 | −24.5 | −11.4 | −20.9 | −19.1 | −5.4 | 11.6 | −8.6 | 7.5 | 10.4 | −19.2 | −14.6 | −15.4 | −2.2 | −6.0 |
“Preop” are the preoperative angles; “BGS” are the angles computed intraoperatively using the system; “PCR” are the angles computed using the postoperative contour registration; “Postop” computes the angles from the acetabular lunate segmented directly from the postoperative CT scan. (−) values represent those conditions where the requisite anatomical features were not visible on the CT reformat. All measurements are in degrees