An 8 year old boy with a history of fall from 10 feet

 An 8 year old boy with a history of fall from 10 feet height complains of pain in the right ankle. Xrays taken at that time are normal without any fracture line. But after 2 years, he developed a calcaneovalgus deformity. The diagnosis is
a) undiagnosed malunited fracture  
b) avascular necrosis talus  
c) tibial epiphyseal  injury


Ans (c)