<prompt> Most common site of stress fracture -2nd metacarpal2nd metatarsalFibulaRibs  <response>: Ans. is b i.e., 2nd metatarsal Three most common sites for stress fractures Second and third metatarsal most common site- due to repeated marching in solider. Fibula 2nd most common and Tibia 3rd most common site - repeated running or dancing. 