Growth parameters in children with achondroplasia: A 7-year, prospective, multinational, observational study

Genet Med. 2022 Dec;24(12):2444-2452. doi: 10.1016/j.gim.2022.08.015. Epub 2022 Sep 16.


Purpose: This study was undertaken to collect baseline growth parameters in children with achondroplasia who might enroll in interventional trials of vosoritide, and to establish a historical control.

Methods: In this prospective, observational study, participants (≤17 years) underwent a detailed medical history and physical examination and were followed every 3 months until they finished participating in the study by enrolling in an interventional trial or withdrawing.

Results: A total of 363 children were enrolled (28 centers, 8 countries). Mean (SD) follow up was 20.4 (15.0) months. In participants <1 year, mean annualized growth velocity (AGV) was 11.6 cm/year for girls and 14.6 cm/year for boys. By age 1 year, mean AGV decreased to 7.4 cm/year in girls and 7.1 cm/year in boys. By age 10 years, mean AGV decreased to 3.6 cm/year for both sexes. Mean height z-score in participants <1 year was -2.5 for girls and -3.2 for boys and decreased up to the age 5 years (-5.3 for girls; -4.6 for boys). Girls and boys had a disproportionate upper-to-lower body segment ratio. Mean ratio was highest in participants aged <1 year (2.9 for girls; 2.8 for boys) and decreased gradually to approximately 2 in both sexes from 4 years of age onward.

Conclusion: This study represents one of the largest datasets of prospectively collected medical and longitudinal growth data in children with achondroplasia. It serves as a robust historical control to measure therapeutic interventions against and to further delineate the natural history of this condition.

Trial registration: NCT01603095.

Keywords: Achondroplasia; Annualized growth velocity; Anthropometrics; Observational; Pediatrics.

Publication types

  • Observational Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Achondroplasia* / diagnosis
  • Achondroplasia* / epidemiology
  • Achondroplasia* / genetics
  • Body Height
  • Child
  • Child, Preschool
  • Female
  • Humans
  • Male
  • Prospective Studies

Associated data