OBSOLETE: Spondyloepimetaphyseal dysplasia

Spondyloepimetaphyseal dysplasia (SEMD) is not a single disease entity but rather a group of rare inherited skeletal disorders characterized by abnormalities affecting the vertebrae (spondylo-), the ends of long bones (epiphyses), and the growing portions of long bones adjacent to the growth plates (metaphyses). This Orphanet entry (ORPHA:252) is classified as obsolete, meaning it has been retired as a standalone grouping and its constituent conditions have been reclassified into more specific diagnostic entities. The various forms of spondyloepimetaphyseal dysplasia affect the skeletal system broadly, leading to short stature, abnormal curvature of the spine (scoliosis or kyphosis), joint pain and stiffness, limb shortening, and characteristic radiographic changes in the spine and long bones. Some forms may also involve other organ systems, including the eyes and the immune system, depending on the specific subtype. Because this is an obsolete umbrella classification, patients previously grouped under this term are now categorized under more precisely defined subtypes, such as SEMD Strudwick type, SEMD with joint laxity, SEMD Missouri type, and others. Each subtype has its own genetic basis, inheritance pattern, and clinical features. Inheritance patterns across the various SEMD subtypes include autosomal dominant, autosomal recessive, and X-linked forms. There is no cure for any form of SEMD; management is supportive and symptomatic, typically involving orthopedic interventions, physical therapy, pain management, and monitoring for complications such as spinal cord compression or joint degeneration. Patients are encouraged to seek evaluation by a clinical geneticist to obtain a precise molecular diagnosis, which can guide prognosis and management.

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