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Osteogenesis imperfecta: a clinical study of the first ten years of life
Insights
Osteogenesis imperfecta (OI) types III and IV present similar fracture rates and deformities in children up to age 10. However, type III OI shows higher instances of nonunion, dentinogenesis imperfecta, and cardiac issues.
Area of Science:
- Pediatrics
- Genetics
- Orthopedics
Background:
- Osteogenesis imperfecta (OI) is a group of genetic disorders characterized by fragile bones.
- Classifying OI into types is crucial for understanding disease progression and prognosis.
Purpose of the Study:
- To document the skeletal changes and clinical manifestations of Osteogenesis Imperfecta (OI) types I, III, and IV in children during their first decade of life.
- To compare the developmental trajectories and specific complications among different OI types.
Main Methods:
- A longitudinal study of 127 children with OI, classified into Sillence types I, III, and IV.
- Establishment of centiles for height, weight, and fracture frequency.
- Documentation of skeletal changes, deformities, and associated medical conditions.
Main Results:
- Skeletal changes were more severe at birth in type III compared to type IV OI.
- During the first 10 years, fracture rates, deformities, and growth retardation were similar between types III and IV.
- Type III OI exhibited higher frequencies of fracture nonunion, dentinogenesis imperfecta, congenital cardiac malformations, and kidney complications compared to type IV.
Conclusions:
- While severe short stature is common in OI types III and IV, serum insulin-like growth factor (IGF) I levels remain within the normal range.
- OI type III presents a distinct pattern of complications compared to type IV, despite similar skeletal progression in early childhood.
Abstract:
One hundred twenty-seven children with osteogenesis imperfecta (O.I.) were studied during the first 10 years of life. According to Sillence, 40 patients were assigned to type I, 39 to type III, and 48 to type IV O.I. Centiles for height, weight, and the annual number of fractures could be established for the different types of O.I. The development of the skeletal changes could be documented for the different forms of the disease. At birth, the skeletal changes were significantly more severe in type III than in type IV patients. During the first 10 years of life the number of fractures, extent of skeletal deformities, and growth retardation did not differ between types III and IV. Only fracture nonunion, dentinogenesis imperfecta, and congenital cardiac malformations were more frequent in type III than in type IV. Papillary calcifications of the kidney and kidney stones were diagnosed in 4 type III and 2 type IV patients. Hemihypertrophy of the body developed in 2 type I patients. Although types III and IV patients suffered from severe short stature, serum insulin-like growth factor (IGF) I was in the normal range.