Results: Clinical features included flattened face, hypertelorism, low nasal bridge and multiple dislocations involving bilateral hip, knee and elbow joints as well as patella.

• 主要临床表现：5例均有颜面扁平、眼距增宽、鼻梁塌陷，伴有多关节脱位，主要累及双髋、双膝、双肘和双髌骨。