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Table 2 Comparative analyses of hip flexion contracture and no significant contracture groups

From: Sustained hip flexion contracture after femoral lengthening in patients with achondroplasia

  Hip FC group
(n = 13)
No significant contracture group
(n = 21)
p-value
Demographic data
 Gender 4:9 8:13 0.665
 Age at operation (years) 10.6 years (6.8–14.6)* 11.5 years (6.8–21.5)* 0.917
Preoperative spinopelvic parameters
 PI (°) 42.1 (36.3–50.2)* 35.6 (30.0–47.8)* 0.261
 PT (°) −2.5 (−6.7–12.2)* − 3.6 (− 7.3–6.0)* 0.972
 SS (°) 44.6 (37.4–55.6)* 39.1 (22.1–47.0)* 0.120
 LL (°) 47.1 (37.2–54.3)* 43.2 (40.1–51.9)* 0.484
 SVA (mm) 17.9 (−17–35.0) −15.2 (− 47.0–40.0) 0.005†
Quantitative assessments of the femoral lengthening
 Initial femoral length 23.3 cm (20.2–26.2)* 25.2 cm (18.0–40.0)* 0.649
 Amount of lengthening 10.1 cm (7.6–13.6)* 8.1 cm (5.8–10.9)* 0.001†
 Lengthening percentage 43.5% (36.5–52.1)* 33.3% (19.0–45.6)* <  0.001†
 EFI (day/cm) 35.7 (21.8–56.6)* 41.4 (23.3–60.0)* 0.309
  1. FC flexion contracture, PT pelvic tilt, PI, pelvic incidence, SS sacral slope, LL lumbar lordosis, EFI external fixation index
  2. *Data presented in parenthesis represent the range
  3. †Statistically significant