Table 1 Extrusion forces and tilting moments of the examined threaded cups in macerated bone with high and low bone density
From: Does osteoporosis reduce the primary tilting stability of cementless acetabular cups?
High bone density | Low bone density | ||||
|---|---|---|---|---|---|
Measurement | Max. extrusion force in N | Max. tilting moment in Nm | Max. extrusion force in N | Max. tilting moment in Nm | |
Zintra | 1 | 5829,6 | 145,7 | 5931,2 | 148,28 |
2 | 8540,5 | 213,5 | 8527,7 | 213,1925 | |
3 | 5222,1 | 130,6 | 2383,3 | 59,5825 | |
4 | 4237,9 | 105,9 | 2427,1 | 60,6775 | |
5 | 4522,6 | 113,1 | 9472,1 | 236,8025 | |
Mean | 5670,5 (1720,0) | 141,8 | 5748,3 (3315,8) | 143,7 | |
95% confidence interval | +/- 1507,6 | +/- 2906,4 | |||
Hofer | 1 | 11045,8 | 276,1 | 3822,3 | 95,5575 |
2 | 10778,2 | 269,5 | 10915,7 | 272,8925 | |
3 | 3928,0 | 98,2 | 6534,2 | 163,355 | |
4 | 10805,5 | 270,1 | 4290,2 | 107,255 | |
5 | 1850,2 | 46,3 | 8582,0 | 214,55 | |
Mean | 7681,5 (4437,3) | 192,0 | 6828,9 (2972,7) | 170,722 | |
95% confidence interval | +/- 3889,4 | +/- 2605,6 | |||