Table 3 The mean range of motion between longer heads of Exeter stem with or without adjustment for leg length discrepancy.
0 mm | + 4-mm | + 8-mm | + 4-mm adjusted | + 8-mm adjusted | |
|---|---|---|---|---|---|
Stem anteversion | |||||
Internal rotation at flexion 60° | |||||
0° | 35.4 | 41.2 | 29.5 | 40.6 | 29.5 |
10° | 47.2 | 51.2 | 39.9 | 51.4 | 39.9 |
20° | 58.6 | 63.0 | 50.6 | 63.2 | 50.9 |
30° | 68.9 | 73.1 | 61.2 | 73.2 | 61.4 |
40° | 78.2 | 82.2 | 71.6 | 82.3 | 71.6 |
Internal rotation at flexion 90° | |||||
0° | 5.5 | 9.9 | 4.2 | 10.8 | 4.5 |
10° | 16.9 | 21.2 | 12.7 | 22.5 | 12.9 |
20° | 28.9 | 32.9 | 22.0 | 33.2 | 22.4 |
30° | 40.1 | 43.8 | 31.6 | 44.2 | 31.8 |
40° | 51.3 | 54.3 | 41.1 | 54.3 | 41.1 |
External rotation at extension 10° | |||||
0° | 59.5 | 62.5 | 45.9 | 62.5 | 45.9 |
10° | 51.7 | 53.4 | 37.0 | 53.6 | 37.0 |
20° | 42.5 | 44.2 | 27.6 | 44.3 | 27.7 |
30° | 31.0 | 33.2 | 18.5 | 33.4 | 18.2 |
40° | 17.0 | 19.8 | 9.1 | 19.9 | 9.1 |
Maximum abduction | |||||
0° | 58.2 | 58.2 | 49.6 | 58.2 | 49.7 |
10° | 58.1 | 58.1 | 49.2 | 58.2 | 49.4 |
20° | 58.1 | 58.1 | 48.6 | 58.1 | 48.6 |
30° | 58.0 | 57.9 | 48.4 | 58.0 | 48.3 |
40° | 58.0 | 57.9 | 47.6 | 57.9 | 47.7 |
Maximum flexion | |||||
0° | 108.2 | 115.4 | 114.2 | 115.4 | 114.2 |
10° | 110.3 | 119.3 | 119.1 | 119.3 | 119.0 |
20° | 120.5 | 125.2 | 125.4 | 125.1 | 125.3 |
30° | 123.9 | 129.4 | 129.4 | 129.4 | 129.2 |
40° | 124.6 | 133.2 | 132.7 | 133.1 | 132.5 |
