Medical complications in children with achondroplasia.

The study used retrospective records from one specialist service, so it describes what was documented rather than measuring a controlled outcome. Data were thinner for older children, because fewer had records across later ages, so complication rates in later childhood and adolescence are less accurate than in early childhood. Polysomnography and hearing tests happened at several centres and were inconsistently reported, so sleep-disordered breathing and hearing outcomes may be underestimated. Obesity was defined by BMI, which is problematic in achondroplasia because height is part of the measure. Delayed seating advice was given, but adherence was not recorded, so its effect on thoracolumbar kyphosis cannot be assessed. The study did not address developmental, psychological, cultural, or social factors that may influence care and outcomes.

Do not read these rates as evidence that specialist care, delayed seating, or therapy prevents complications. The study describes records over time and did not compare treatment groups, so it cannot show cause or prevention.