D2I2.
genetic

Pseudoachondroplasia

Pseudoachondroplasia is an inherited disorder of bone growth. It is a disorder which is linked to in the COMP gen located on 19. It is generally not discovered until 2–3 years of age, since growth is normal at first. Pseudoachondroplasia is usually first detected by a drop of linear growth in contrast to peers, a waddling gait or arising lower limb deformities.

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Plain-language summary adapted from Wikipedia. Not medical advice.