Not all fractures are that clear cut.
Possible Occult Fracture
A fracture is a broken bone. Occult means hidden. An occult fracture is one that does not appear on an X-ray. A possible occult fracture is a suspected fracture that needs to be confirmed with other imaging tests.
Occult fractures can occur because of a fall or other type of sudden (acute) injury. They can also occur because of repetitive injuries or normal stresses on weak bones. Fractures caused by repetitive injuries are fatigue fractures. Those that result from normal stresses on weak bones are insufficiency fractures. Another name for these fractures is stress fractures.
Common sites for occult fractures include the hip, shin, upper arm, and the bones of the ankle, foot, wrist, and spine. Stress fractures are more common in the lower part of the body than in the upper part. They are also more common in women than in men. They often occur in athletes and military recruits.