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Table 1 Comparison of the degree of hip flexion contracture between the hip flexion contracture and no significant contracture groups

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

Hip FC (°)

Hip FC group (n = 13)

No significant contracture group (n = 21)

p-value

Before surgery

6.3 (5–7)*

1.8 (0–5)*

0.005†

During the distraction osteogenesis

 Latency period

25.0 (10–35)*

23.7 (8–33)*

0.740

 Lengthening period (early)

19.5 (0–25)*

14.5 (0–20)*

0.619

 Lengthening period (end)

38.7 (32–42)*

20.3 (5–25)*

<  0.001†

 Consolidation period

33.7 (30–35)*

6.8 (0–15)*

<  0.001†

 Final follow-up

2.0 (0–5)*

1.3 (0–3)*

0.459

  1. FC flexion contracture
  2. *Data presented in parenthesis represent the range
  3. †Statistically significant