Table 1 Demographic information

Mean age, (years)

74.8 ± 5.9 (68–89)

Sex, n (%)

 Male

0 (0.0)

 Female

18 (100.0)

Body mass index (kg/m²)

24.2 ± 3.9 (16.4–29.9)

Bone mineral density(T-score)

−2.0 ± 1.2 (−4.3–0.3)

ASA^a physical status class, n (%)

 I

1 (5.6)

 II

15 (83.3)

 III

2 (11.1)

Operative side, n (%)

 Left

11 (61.1)

 Right

7 (38.9)

Su classification, n (%)

 Type I

2 (11.1)

 Type II

3 (16.7)

 Type III

13 (72.2)

Operative time (minutes)

146.2 ± 44.8 (92–255)

Hospitalization days (days)

45.9 ± 32.6 (6–123)

Follow-up (months)

14.8 ± 10.2 (12–43)

Time to callus formation (weeks)

7.8 ± 3.5 (2–14)

Time to bone union (weeks)

18.4 ± 9.8 (10–51)

JLETS^b

37.6 ± 8.5 (24–53)

Knee ROM^c

110.3 ± 15.7 (80–135)

Varus-valgus angle (degrees)

3.2 ± 3.3 (−2.9–10.5)

Shortening, n (%)

12 (66.7)

Complication, n (%)

 Malunion

3 (16.7)

 Nonunion

0 (0.0)