Distal radius distraction osteotomies
Demographics
| Characteristic | Overall, N = 521 | Type of Bone Graft | p-value2 | |
|---|---|---|---|---|
| Structural, N = 181 | Non-Structural, N = 341 | |||
| Age (Years) | 52.2 +/- 18.6 | 52.1 +/- 19.7 | 52.2 +/- 18.2 | 0.989 |
| Sex | 0.120 | |||
| Female | 36 (69.2%) | 10 (55.6%) | 26 (76.5%) | |
| Male | 16 (30.8%) | 8 (44.4%) | 8 (23.5%) | |
| BMI | 25.9 +/- 5.5 | 26.1 +/- 5.1 | 25.7 +/- 5.7 | 0.781 |
| Smoking Status | 0.460 | |||
| Never | 28 (53.8%) | 8 (44.4%) | 20 (58.8%) | |
| Former | 14 (26.9%) | 5 (27.8%) | 9 (26.5%) | |
| Current | 10 (19.2%) | 5 (27.8%) | 5 (14.7%) | |
| Time From Injury to Surgery (Months) | 4.0 +/- 4.3 | 6.2 +/- 4.0 | 2.8 +/- 4.0 | 0.008 |
| Preoperative Volar Tilt (Degrees) | -7.1 +/- 21.4 | -6.7 +/- 22.9 | -7.3 +/- 21.0 | 0.930 |
| Preoperative Ulnar Variance (mm) | 0.8 +/- 1.1 | 0.9 +/- 1.0 | 0.8 +/- 1.2 | 0.713 |
| Preoperative Radial Inclination (Degrees) | 15.6 +/- 6.2 | 17.5 +/- 7.8 | 14.7 +/- 5.1 | 0.189 |
| 1 Mean +/- SD; n (%) | ||||
| 2 Welch Two Sample t-test; Pearson's Chi-squared test; Fisher's Exact Test for Count Data with simulated p-value (based on 2000 replicates) | ||||
Between-group differences by timepoint
| Characteristic | Volar Tilt | Ulnar Variance | Radial Inclination | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Structural, N = 181 | Non-Structural, N = 341 | p-value2 | Structural, N = 181 | Non-Structural, N = 341 | p-value2 | Structural, N = 181 | Non-Structural, N = 341 | p-value2 | |
| Preoperative | -6.7 +/- 22.9 | -7.3 +/- 21.0 | 0.930 | 0.9 +/- 1.0 | 0.8 +/- 1.2 | 0.713 | 17.5 +/- 7.8 | 14.7 +/- 5.1 | 0.189 |
| Postoperative | 3.9 +/- 9.2 | 8.3 +/- 9.6 | 0.110 | -0.1 +/- 0.8 | -0.3 +/- 0.6 | 0.437 | 21.9 +/- 6.0 | 19.1 +/- 5.3 | 0.104 |
| Final Follow-Up | 4.2 +/- 7.5 | 7.7 +/- 10.2 | 0.163 | -0.1 +/- 0.8 | -0.1 +/- 0.7 | 0.949 | 21.7 +/- 5.2 | 18.1 +/- 5.1 | 0.022 |
| 1 Mean +/- SD | |||||||||
| 2 Welch Two Sample t-test | |||||||||
Comparison of within-group differences
Volar tilt
Volar tilt increased a mean of 10.8 +/- 17.6 degrees from preoperative to postoperative in the structural group versus 15.7 +/- 19.6 degrees in the non-structural group (p = 0.383). From initial postoperative to final follow-up, volar tilt changed 0.3 +/- 3.4 degrees in the structural group versus -0.5 +/- 4.7 degrees in the non-structural group (p = 0.498).
Ulnar variance
Ulnar variance changed a mean of -1 +/- 1.5 mm from preoperative to postoperative in the structural group versus -1 +/- 1 mm in the non-structural group (p = 1). From initial postoperative to final follow-up, ulnar variance changed 0 +/- 0.8 mm in the structural group versus 0.2 +/- 0.4 mm in the non-structural group (p = 0.436).
Radial inclincation
Radial inclination changed a mean of 5 +/- 5.4 degrees from preoperative to postoperative in the structural group versus 4.4 +/- 5.6 degrees in the non-structural group (p = 0.697). From initial postoperative to final follow-up, radial inclination changed -0.1 +/- 2.9 degrees in the structural group versus -0.8 +/- 4.7 degrees in the non-structural group (p = 0.556).