Answer: Fracture of so called fatigue sex is phalange head tiny flaw appears below outer force, its happening the fracture that reason and general outside force bump, it is different.

• 答：所谓的疲惫性骨折是指骨头在外力下出现细小的裂纹，它的发生原因和一般外力撞击下的骨折，是不一样的。