A<unk>  is one type of incomplete fracture in bones. It is caused by "unusual or repeated<unk> " This is in contrast to other types of fractures, which are usually characterized by a solitary, severe impact.
It could be described as a very small sliver or crack in the bone; this is why it is sometimes dubbed "hairline fracture". It typically occurs in weight-bearing bones, such as the tibia (bone of the lower leg) and metatarsals (bones of the foot).
It is a common sports injury, and more than half of the cases are associated with athletics.
Stress fracture
Fracture nonunion
Blowout fracture
Compression fracture
Ankle fracture
Avulsion fracture
Pseudarthrosis
Chance fracture