Short stature, very slender, poor weight gain,
delayed bone age, and absent patellae may be signs, but they are more part
of the delayed bone age. Habitual elbow dislocation, slender ribs, slender
long bones, abnormal glenoid fossas, hooked clavicles, clinodactyly,
epiphyseal flattening, camptodactyly, blunt osteochondritis dissecans,
aseptal necrosis of the lateral femoral condyles, bilateral microtia with
dysplasia of the labyrinthus, micrognathia.