Table 2.
The progressions of pelvic tilt, cup anteversion and cup inclination before and after bilateral total hip arthroplasties
| Pre. | 2 m. | 6 m. | 1 y. | 2 y. | 4 y. | 6 y. | 8 y. | 12 y. | ||
| Pelvic
Tilt |
Sup. | 30.6 | 22.5 | 16.2 | 8.9 | 10.2 | 11.0 | 10.0 | 10.4 | 8.6 |
| Stand | 33.3 | 15.7 | 10.7 | 10.6 | 12.4 | 4.5 | 6.5 | 3.7 | 3.8 | |
| Pelvic
Angle |
Sup. | –1.6 | 9.6 | 8.8 | 14.4 | 13.2 | 14.3 | 12.2 | 14.3 | 14.5 |
| Stand | –7.2 | 14.5 | 14.4 | 17.8 | 11.7 | 20.7 | 17.3 | 20.0 | 18.7 | |
| Cup
Antev. |
Sup. | - | 7.6
/9.4 |
11.6
/18.6 |
12.7
/24.4 |
15.2
/22.1 |
17.7
/17.6 |
14.7
/21.6 |
13.8
/23.0 |
15.7
/22.1 |
| Stand | - | 14.9
/14.5 |
16.9
/21.1 |
13.6
/23.6 |
16.1
/23.9 |
20.6
/22.8 |
18.3
/20.9 |
20.0
/26.3 |
20.8
/24.2 |
|
| Cup
Inclin. |
Sup. | - | 40.0
/55.8 |
42.1
/56.8 |
42.4
/59.5 |
43.1
/59.0 |
42.5
/58.8 |
42.1
/59.0 |
43.4
/59.3 |
43.2
/59.2 |
| Stand | - | 41.0
/58.0 |
42.6
/58.8 |
43.0
/59.4 |
43.4
/59.2 |
43.1
/60.2 |
43.0
/60.0 |
43.7
/59.7 |
43.3
/60.7 |
This table is shown in the manner of right/left. All numbers are in degrees.
Pelvic Tilt was estimated by Muir’s nomogram. This indicates the angle of the anterior pelvic plane relative to a vertical axis, positive for anterior tilt. Pelvic Angle was calculated by Konishi’s formula. This indicates the amount of change from the average pelvic tilt, positive for posterior tilt.
Pre.: pre-operation
m.: month
y.: year
Sup.: supine
Antev.: anteversion
Inclin.: inclination