Table 1.
Leg lengthening: baseline patient characteristics after matching
| Baseline characteristics | Controls (N = 1434) | Cases (N = 478) | |
|---|---|---|---|
|
Sex |
M |
46.7% |
46.7% |
| |
F |
53.3% |
53.3% |
|
Age at procedure (years) |
Mean (SD) |
67 (9) |
67 (9) |
|
Weight (kg) |
Mean (SD) |
74 (14) |
75 (15) |
|
Height (cm) |
Mean (SD) |
165 (9) |
165 (9) |
|
Charnley class |
A |
54.3% |
47.4% |
| |
BB |
22.4% |
29.6% |
| |
B |
21.4% |
21.1% |
| |
C |
1.9% |
1.9% |
|
Previous Surgery |
Yes |
3.6% |
4.4% |
|
Clinic Size |
small |
5.0% |
5.0% |
| |
medium |
52.4% |
49.2% |
| |
large |
42.6% |
45.8% |
|
Fixation of Components |
all cemented |
17.5% |
16.3% |
| |
all uncemented |
18.0% |
18.8% |
| |
hybrid |
50.0% |
49.2% |
| |
reverse hybrid |
14.5% |
15.7% |
|
Duration of procedure |
<90 min |
54.5% |
55.4% |
| |
90 min > x < 135 min |
38.6% |
37.7% |
| |
>135 min |
6.9% |
6.9% |
|
Decade of procedure |
1970's |
3.0% |
1.5% |
| |
1980's |
50.8% |
50.0% |
| |
1990's |
45.3% |
47.7% |
| after 2000 | 0.9% | 0.8% |
Abbreviation: SD = standard deviation.