Table 3.
Segment demographic characteristics. Data is presented as numbers (%) and median, interquartile range (IQR), and (minimum–maximum)
| Factor | All segments | Sub-cohort of segments a |
|---|---|---|
| Lengthened segments | 314 | 257 |
| AAUH, Denmark b | 279 (87) | 223 (87) |
| NCH, USA c | 35 (13) | 34 (13) |
| Patients | 257 | 257 |
| Patients with multiple segments | 35 (14) | 0 |
| 2 lengthened segments | 24 | |
| 3 lengthened segments | 3 | |
| 4 lengthened segments | 7 | |
| 7 lengthened segments | 1 | |
| Male sex | 165 (53) | 143 (56) |
| Female sex | 149 (47) | 114 (44) |
| Age at nail insertion | ||
| median (IQR) | 19.5 (16.4–29.9) | 19.5 (16.4–33.6) |
| (min–max) | (9.5–76.9) | (9.5–76.9) |
| LLD d etiology | ||
| Congenital | 64 (20) | 61 (24) |
| Acquired/developmental | 143 (46) | 133 (52) |
| Short stature | 69 (22) | 25 (10) |
| Unknown | 38 (12) | 38 (15) |
| Median (IQR) preoperative LLD e | 3.1 (2.5–4) | 3.0 (2.5–4) |
| (min–max) | (1–14) | (1–13) |
| Other procedure at primary surgery | 153 (49) | 127 (49) |
| Duration of implantation, days | ||
| median (IQR) | 410 (336–632) | 393 (329–569) |
| (min–max) | (45–2,372) | (45–2,166) |
| Length of follow-up, days) | ||
| median (IQR) | 646 (478–1,073) | 583 (478–1,073) |
| (min–max) | (176–3,718) | (176–3,718) |
| Previous lengthening f | ||
| None | 248 (79) | 214 (83) |
| Segment | 32 (10) | 24 (9) |
| Limb | 34 (11) | 19 (7) |
| Angle correction in frontal or sagittal plane | 80 (25) | 64 (25) |
a
Sub-cohort of segments used for regression analysis of risk is the unique group that by random selection ensures that every patient was represented by only 1 segment.
b
AAUH: Aalborg University Hospital.
c
NCH: Nationwide Children’s Hospital.
d
LLD: Limb length discrepancy
e
Short stature is not included.
f
in the same patient