Multiple Epiphyseal Dysplasia
MED is characterised by irregular delayed ossification at multiple epiphysis.
The proximal femoral involvement can be confused with Perthes, but MED is bilateral and symmetric, has early acetabular changes and does not have metaphyseal cysts.
Characteristics
AD
Short limbs
Irregular, delayed ossification at several epiphyses
Waddling gait
Early hip OA