Table 4 The mean range of motion between longer heads of VLIAN stem with or without adjustment for leg length discrepancy.
0 mm | + 4 mm | + 7 mm | + 4 mm adjusted | + 7 mm adjusted | |
|---|---|---|---|---|---|
Stem anteversion | |||||
Internal rotation at flexion 60° | |||||
0° | 21.3 | 27.0 | 29.7 | 27.5 | 30.3 |
10° | 36.7 | 42.8 | 44.5 | 42.2 | 43.9 |
20° | 49.6 | 56.0 | 56.3 | 54.5 | 55.3 |
30° | 60.5 | 67.1 | 68.0 | 66.1 | 66.9 |
40° | 72.4 | 77.9 | 78.8 | 76.5 | 77.4 |
Internal rotation at flexion 90° | |||||
0° | 2.8 | 4.5 | 5.8 | 5.7 | 7.0 |
10° | 8.8 | 13.1 | 14.0 | 19.3 | 15.5 |
20° | 18.3 | 23.3 | 24.1 | 25.2 | 26.1 |
30° | 31.4 | 37.2 | 37.0 | 38.7 | 38.8 |
40° | 42.9 | 48.4 | 47.7 | 49.4 | 48.5 |
External rotation at extension 10° | |||||
0° | 61.2 | 63.1 | 57.8 | 63.1 | 57.8 |
10° | 52.4 | 54.1 | 49.2 | 54.1 | 49.2 |
20° | 42.8 | 44.8 | 40.8 | 44.4 | 40.8 |
30° | 29.3 | 32.1 | 30.0 | 31.1 | 28.8 |
40° | 16.3 | 20.7 | 19.8 | 19.2 | 18.2 |
Maximum abduction | |||||
0° | 61.2 | 61.3 | 59.5 | 61.3 | 59.5 |
10° | 61.1 | 61.2 | 59.1 | 61.2 | 59.1 |
20° | 61.1 | 61.1 | 58.7 | 61.1 | 58.7 |
30° | 61.0 | 61.1 | 58.5 | 61.1 | 58.5 |
40° | 61.0 | 61.0 | 58.2 | 61.0 | 58.2 |
Maximum flexion | |||||
0° | 106.1 | 115.7 | 114.6 | 115.3 | 113.2 |
10° | 109.9 | 117.4 | 117.2 | 117.2 | 117.1 |
20° | 116.2 | 124.7 | 124.2 | 124.4 | 123.9 |
30° | 120.8 | 128.3 | 127.2 | 128.2 | 127.3 |
40° | 122.9 | 131.5 | 130.2 | 131.0 | 130.9 |
