TABLE 1:
Comparison of basal angle measurements with standard radiographic and standard MR imaging techniques
| Author | Technique | Mean | Maximum | Minimum | 95% Confidence Limit* |
|---|---|---|---|---|---|
| Brailsford7 | Radiography | 135° | 149° | 121° | Not applicable |
| McGregor2 (n = 203) | Radiography | 134° | 148° | 121° | 141°, 127° |
| Poppel et al3 (n = 102) | Radiography | 137° | 152° | 123° | 147°, 127° |
| Present series | |||||
| Adults | MR imaging | 129° ± 6° | 143° | 113° | 130°, 128° |
| Children | MR imaging | 127° ± 5° | 136° | 114° | 128°, 126° |
Note.—Measurements are provided to nearest whole unit.
*
Upper and lower 95% confidence limits for radiographic series are estimated on the basis of standard deviations and sample size.