Table 1.
Radiographic measurements in one hundred fifty normal wrists.
| Mean | Median * | Range | Normal limits | |
|---|---|---|---|---|
| Ulnar variance | .99 | 1.0 ± 1.6 | -3.0 -5.0 | -2-3 |
| Radial length | 12.1 | 12.0 ± 1.7 | 8.0 -18.0 | 10-15 |
| Radial inclination | 25.3 | 25.0 ± 4.0 | 12.0 – 34.0 | 18-32 |
| Carpal height | 32.2 | 32.0 ± 2.8 | 26.0 -40.0 | 28-37 |
| Third metacarpal length | 61.4 | 60.0 ± 5.6 | 28-76 | 54-71 |
| Radial carpal distance | 17.5 | 17.0 ± 2.1 | 10.0 -25.0 | 14.5-21 |
| Ulnar carpal distance | 18.7 | 19.0 ± 2.4 | 13-26 | 15-23 |
| Distal radioulnar joint angle | 3.0 | .00 ± 10.3 | -20-30 | -13-21 |
| Lunate uncoverage length | 4.1 | 4.0 ± 1.3 | 1-9 | 2-7 |
| Lunate width | 14.2 | 14.0 ± 1.7 | 10-20 | 11.5-17.4 |
| Capitate length | 21.8 | 22.0 ± 2.3 | 15-28 | 19-27 |
| Radial tilt | 10.2 | 10.0 ± 5.1 | 0-24 | 0-20 |
| Scapholunate angle | 51.8 | 50.0 ± 8.4 | 30-80 | 40-67 |
| Carpal height ratio (Youm) | 52.3 | 52.0 ± 3.1 | 46- 60 | 47-50 |
| Carpal height ratio (Nattrass) | 1.4 | 1.5 ± .09 | 1.2 -2.0 | 1.2-1.6 |
|
| ||||
| Lunate uncoverage ratio | 28.7 | 28.0 ± 7.3 | 9-58 | 16-41 |
*
Median and standard deviation