raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:1822

Dysplasia epiphysealis hemimelica

Synonyms: Trevor disease

Type
Malformation syndrome
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Adolescent, Childhood
Status
active

A rare bone development disorder characterized by localized, asymmetric osteochondral overgrowth affecting single or multiple epiphyses, most commonly the distal femur, proximal tibia, and talus. The lesions are typically restricted to one side of the epiphysis, with the medial side being affected twice as often as the lateral side. The condition is usually diagnosed in children, and three times more often in boys than in girls. Patients present with pain, limitation in range of motion, and deformity or swelling of the affected joint.

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Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enDysplasia epiphysealis hemimelicaTrevor disease
frDysplasie épiphysaire hémiméliqueMaladie de Trevor
deDysplasia epiphysealis hemimelicaTrevor-Krankheit
esDisplasia epifisaria hemimélicaEnfermedad de Trevor
itDisplasia epifisaria emimelicaMalattia di Trevor
nlDysplasia epiphysealis hemimelicaZiekte van Trevor
ptDisplasia epifisária hemimélicaDoença de Trevor
plPołowicza dysplazja nasadowaChoroba Trevora
csHemimelická epifyzární dysplázieTrevorova nemoc
ukЕпіфізарна дисплазія гемімелічнаХвороба Тревора
zh半肢畸形骨骺发育异常Trevor病
trDisplazi epifiziyalis hemimelikaTrevor hastalığı

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM127800Evalidated
ICD-10Q74.8NTBTattributedvalidated
ICD-11LD24.2YNTBTindexvalidated
MONDO0007489Evalidated
MeSHC537997Evalidated
UMLSC0432282Evalidated
GARD2019Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

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Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

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Genes

0 direct

Orphanet records no gene directly on this code.

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Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Annual incidence1-9 / 1 000 0000.1 / 100 000WorldwideValue and classNot yet validated13295331[PMID]_29252895[PMID]
Point prevalenceUnknown—WorldwideClass onlyValidatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

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HPO phenotypes

16 annotations · validated 2016-06-01
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0005930Abnormality of epiphysis morphology
HP:0005616Accelerated skeletal maturation
HP:0100555Asymmetric growth
HP:0002653Bone pain
HP:0100777Exostoses
HP:0010582Irregular epiphyses
HP:0001387Joint stiffness
HP:0002758Osteoarthritis
HP:0001763Pes planus
HP:0008368Tarsal synostosis
Frequent (79-30%)
HP:0002857Genu valgum
HP:0002970Genu varum
Occasional (29-5%)
HP:0003367Abnormal femoral neck morphology
HP:0002823Abnormality of femur morphology
HP:0008812Flattened femoral head
HP:0002757Recurrent fractures

Run the differential on the 10 obligate / very frequent terms

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Sources for this card