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  • Title: Predicting ambulatory function at skeletal maturity in children with moderate to severe osteogenesis imperfecta.
    Author: Montpetit K, Lafrance ME, Glorieux FH, Fassier F, Hamdy R, Rauch F.
    Journal: Eur J Pediatr; 2021 Jan; 180(1):233-239. PubMed ID: 32719894.
    Abstract:
    Maximizing ambulation is a key treatment aim in moderate to severe osteogenesis imperfecta (OI). Here we investigated which early clinical characteristics predicted ambulation function at skeletal maturity. We assessed Bleck ambulation scores in 88 individuals with OI at 5 to 6 years of age and again at final height (at 15 to 24 years of age). At 5 to 6 years of age, 33 (38%) children were non-ambulators, 32 (36%) were fully independent ambulators, and 23 (26%) had intermediate ambulation skills. At skeletal maturity, 58% of the study participants had the same mobility level as at first assessment. The ability to ambulate independently at skeletal maturity was predicted by independent ambulation at 5 to 6 years (odds ratio [OR] 22.6, 95% confidence interval [CI] 4.9-105; P < 0.001), height z score at 5 to 6 years (OR 3.1, CI 1.6-6.3; P = 0.001) and weight z score at 5 to 6 years (OR 0.44, CI 0.19-0.99; P = 0.04).Conclusion: Independent ambulation at 5 to 6 years was the main determinant of independent ambulation at skeletal maturity. This highlights the importance of maximizing ambulation in children below 5 years of age. What is Known: •walking ability varies markedly between OI types. The highest level of mobility was found in OI type I, the lowest in OI type III who require mobility aids; intermediate levels were reported for OI type IV. • OI type is a key predictor of ultimate ability to ambulate, whereas the timing of developmental milestones was not associated with walking ability What is New: • overall key predictors of mobility function at skeletal maturity were mobility status and height z-score at 5-6 years of age • Childrenwho were non-ambulators at 5 to 6 years of age had a higher chance of having better mobility at skeletal maturity if they had good upper extremity function, as expressed in the PEDI Self Care Score.
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