Otospondylomegaepiphyseal dysplasia (OSMED) is a skeletal disorder characterized by skeletal abnormalities, distinctive facial features, and severe hearing loss. The condition involves the ears (oto-), affects the bones of the spine (spondylo-), and enlarges the ends (epiphyses) of long bones in the arms and legs. The features of OSMED are similar to those of another skeletal disorder, Weissenbacher-Zweymüller syndrome.
People with OSMED are often shorter than average because the bones in their legs are unusually short. Other skeletal features include enlarged joints; short arms, hands, and fingers; and flattened bones of the spine (platyspondyly). People with the disorder often experience back and joint pain, limited joint movement, and arthritis that begins early in life.
Severe high-tone hearing loss is common in people with OSMED. Typical facial features include protruding eyes; a flattened bridge of the nose; an upturned nose with a large, rounded tip; and a small lower jaw. Virtually all affected infants are born with an opening in the roof of the mouth (a cleft palate). The skeletal features of OSMED tend to diminish during childhood, but other signs and symptoms, such as hearing loss and joint pain, persist into adulthood.
This condition is rare; the prevalence is unknown. Only a few families with OSMED have been reported worldwide.
Mutations in the COL11A2 gene cause OSMED. The COL11A2 gene is one of several genes that provide instructions for the production of type XI collagen. This type of collagen is important for the normal development of bones and other connective tissues that form the body's supportive framework. Mutations in the COL11A2 gene that cause OSMED disrupt the production or assembly of type XI collagen molecules. The loss of type XI collagen prevents bones and other connective tissues from developing properly.
Read more about the COL11A2 gene.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
You might find information on treatment of OSMED in
Educational resources and Patient support.
You may find the following resources about OSMED helpful. These materials are written for the general public.
You may also be interested in these resources, which are designed for healthcare professionals and researchers.
- Gene Tests - DNA tests ordered by healthcare professionals
- PubMed - Recent literature
- OMIM - Genetic disorder catalog
- Chondrodystrophy with sensorineural deafness
- Insley-Astley syndrome
- Mega-epiphyseal dwarfism
- Nance-Insley syndrome
- Nance-Sweeney chondrodysplasia
- Oto-spondylo-megaepiphyseal dysplasia
The resources on this site should not be used as a substitute for
professional medical care or advice. Users seeking information about
a personal genetic disease, syndrome, or condition should consult with a qualified
See How can I find a genetics professional in my area? in the Handbook.