meyer dysplasia

Meyer dysplasia (also known as dysplasia epiphysealis capitis femoris) is a fragmentation and delayed ossification of the femoral capital epiphyses that affects the pediatric hips. It is considered more of a normal hip developmental variation rather than a true dysplasia. It can be bilateral in ~50% of cases .

Epidemiology

It tends to present at around 2-3 years of age .  There is a recognized male predilection .

Clinical presentation

Patients are usually asymptomatic.

Pathology

There is a delay in development of the nucleus of ossification in the hip which does not occur until ~1.5 years of age. The epiphysis does not collapse and density and structure remain preserved. It usually resolves spontaneously later in childhood.

Radiographic features 

Plain radiograph

• the affected epiphysis is smaller in size
• there are often multiple nuclei of ossification, giving the epiphysis a "morulated" appearance; these then tend to fuse at ~5 years of age. 

History and etymology

First described by J Meyer in 1964 .

Differential diagnosis

On imaging consider

• avascular necrosis of the hip
  • Legg-Calvé-Perthes disease
• multiple epiphyseal dysplasia

Siehe auch:

• Hüftkopfnekrose
• epiphyseale Dysplasien
• idiopathische kindliche Hüftkopfnekrose