TABLE 4.
Measurement for Second Postoperative Follow-Up Films
| n | Volar Tilt* | Radial Inclination | Ulnar Variance† | Radial Height | Stepoff | |
|---|---|---|---|---|---|---|
| Overall (% [n]) | 185 | 48% (88) | 43% (79) | 52% (97) | 12% (22) | 92% (171) |
| Mean (SD) | 7° (6.1°) | 22° (4.5°) | 0.9 mm (2.2 mm) | 10.5 mm (3.0 mm) | ||
| Minimum to maximum | −13° to 25° | 2° to 30° | −5.6 to 8.2 mm | 2.4–18.7 mm | ||
| AO class | ||||||
| 1 | 31 | 65% (20) | 52% (16) | 71% (22) | 16% (5) | 100% (31) |
| 2 | 6 | 67% (4) | 50% (3) | 50% (3) | 50% (3) | 100% (6) |
| 3 | 3 | 100% (3) | 67% (2) | 33% (1) | 33% (1) | 100% (3) |
| 4 | 3 | 67% (2) | 0% | 100% (3) | 33% (1) | 100% (3) |
| 5 | 3 | 67% (2) | 67% (2) | 67% (2) | 0% | 67% (2) |
| 6 | 10 | 60% (6) | 30% (3) | 40% (4) | 0% | 90% (9) |
| 7 | 42 | 38% (16) | 50% (21) | 60% (25) | 14% (6) | 95% (40) |
| 8 | 39 | 39% (15) | 28% (11) | 36% (14) | 8% (3) | 80% (31) |
| P value | .019† | .483 | .174 | .071 | .547 | |
| Frykman | ||||||
| 1 | 9 | 89% (8) | 89% (8) | 67% (6) | 0% | 100% (9) |
| 2 | 14 | 57% (8) | 50% (7) | 79% (11) | 14% (2) | 100% (14) |
| 3 | 18 | 33% (6) | 44% (8) | 44% (8) | 6% (1) | 89% (16) |
| 4 | 14 | 71% (10) | 43% (6) | 64% (9) | 14% (2) | 86% (12) |
| 5 | 4 | 25% (1) | 25% (1) | 0% | 50% (2) | 100% (4) |
| 6 | 10 | 50% (5) | 40% (4) | 80% (8) | 30% (3) | 100% (10) |
| 7 | 23 | 39% (9) | 9% (2) | 44% (10) | 13% (3) | 91% (21) |
| 8 | 45 | 47% (21) | 49% (22) | 49% (22) | 13% (6) | 87% (39) |
| Four-group P value | .292 | .109 | .296 | .121 | .756 |
Data represent the percentage of fractures that fall into the normal range for each parameter and for each fracture classification, the mean measurement achieved, and the range of measurements for each parameter. P values are from a logistic model that also includes age, sex, presurgery measure average, AO classification with 3 groups, and Frykman classification with 4 groups.
*
Minus values indicate dorsal tilt.
†
Minus values indicate negative ulnar variance.
‡
Statistically significant value.