Growth in diastrophic dysplasia

Area of Science:

• Genetics and developmental biology
• Pediatric endocrinology
• Skeletal dysplasias

Background:

• Diastrophic dysplasia (DTD) is a rare skeletal dysplasia characterized by significant growth impairment.
• Understanding growth patterns and their determinants in DTD is crucial for clinical management.

Purpose of the Study:

• To analyze growth patterns and associated factors in diastrophic dysplasia (DTD).
• To develop standard growth curves specifically for individuals with DTD.

Main Methods:

• Collected growth data from 121 Finnish patients diagnosed with DTD.
• Constructed percentile growth curves for height and relative weight using interpolated individual data.
• Assessed pubertal growth, intrafamilial growth variability, and predictors of adult height.

Main Results:

• Median adult height was 135.7 cm for males and 129.0 cm for females.
• Progressive growth failure was observed, exacerbated by a diminished pubertal growth spurt.
• Adult height correlated strongly with early childhood height (1 and 5 years) but not midparental height.
• Relative weight increased pre-puberty, with 28% of adults being overweight; head circumference remained normal.

Conclusions:

• Diastrophic dysplasia (DTD) leads to profound and progressive growth failure of variable intensity.
• Developed growth charts are valuable for tracking DTD patient progress.
• These charts can assist in predicting final adult height and assessing the efficacy of growth-enhancing treatments.