Wikis > Orthopaedics > Bone and Joint/Skeletal Dysplasia/Osteochrondroplasia > Multiple epiphyseal dysplasia
Multiple epiphyseal dysplasia (MED):
Group of disorders characterised by dysplasia (irregular and delayed ossification) of several epiphyses of tubular bones. Autosomal dominant transmission is more common.
Dwarfing in mild
Variable clinical presentation:
Childhood waddling gait, difficult climbing stairs
Adult premature osteoarthritis
Types:
MED 1:
• mutation in gene coding for COMP similar to pseudoachondroplasia, but with more subtle protein alteration
MED 2:
• mutation in gene coding for the alpha-2 polypeptide chain of type IX collagen
• results in non-inflammatory articular cartilage degeneration
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