<prompt> Causes of Psedoahrosis is all of the following except -Idiopathicmultiple compound FracturesOsteomyelitisNeurofibromatosis  <response>: Pseudoahrosis is pseudo joints it can be seen after a fracture - non union of a fracture may be painless if pseudojoint forms between fracture ends. it can be idiopathic can be seen in neurofibromatosis congenital pseudoahrosis of tibia - rare condition , in 50-90 cases neurofibromatosis is present in established cases - Boyd dual onlay graft is the treatment of choice in patients with street fracture. REF:textbook of ohopedics, John ebnezer, 4th edition ,pg.no.501 