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Osteogenesis imperfecta is a group of genetic disorders, all of which cause bone fragility. OI has high genetic heterogeneity , that is, many different genetic mutations lead to the same or similar sets of observable symptoms ( phenotypes ).
The clinical features of the type II and XI collagenopathies vary among the disorders, but there is considerable overlap. Common signs and symptoms include problems with bone development that can result in short stature, enlarged joints, spinal curvature, and arthritis at a young age.
Ehlers–Danlos syndrome - diverse collection of disorders distinguished by the fragility of soft connective tissues and widespread symptoms affecting the skin, ligaments, joints, blood vessels, and internal organs. [5] Osteogenesis imperfecta - hereditary condition marked by reduced bone mass, weakened bones, increased brittleness, and short ...
The symptoms of a vertebral collapse ("compression fracture") are sudden back pain, often with radicular pain (shooting pain due to nerve root compression) and rarely with spinal cord compression or cauda equina syndrome. Multiple vertebral fractures lead to a stooped posture, loss of height, and chronic pain with resultant reduction in mobility.
In classic non-deforming osteogenesis imperfecta with blue sclerae or common variable osteogenesis imperfecta with normal sclerae, nearly 60% of cases are de novo. COL1A1/2-related osteogenesis imperfecta is identified by repeated fractures with trivial trauma, defective dentinogenesis imperfecta (DI), and hearing loss.
Osteoporosis is rare in children and adolescents. When it occurs, it is usually secondary to some other condition, [1] e.g. osteogenesis imperfecta, rickets, eating disorders or arthritis. In some cases, there is no known cause and it is called idiopathic juvenile osteoporosis. Idiopathic juvenile osteoporosis usually goes away spontaneously. [2]
Osteogenesis Imperfecta (types 1–4): Mutations in COL1alpha 1 and/or COL1alpha2 are known to cause several different types of Osteogenesis Imperfecta with the severity of said diseases being related to the type and frequency of the mutations occurring. [9] For further information on COL1's effect in this disease, see Collagen, type 1, alpha 1.
It was first discovered in 1972 by Bianchine et al. when they described three families with osteogenesis imperfecta, pseudoglioma, retinoblastoma, and recurrence of bone fractures. [ 8 ] References