A wrist fracture can be caused by similar types of accidents and trauma that cause wrist sprains. In general, the larger and stronger bones are, the less likely they are to break in response to trauma — instead, the ligaments will stretch and tear. But when they do, they often create a misaligned or crooked appearance. The eight carpal bones of the wrist are small, so a misaligned or crooked wrist may be difficult (or impossible) to notice, especially with hairline fractures, but more serious breaks are easier to tell.  The most commonly broken long bone within the wrist area is the radius, which is a forearm bone that attaches to the small carpal bones.  The most commonly fractured carpal bone is the scaphoid bone, which is unlikely to cause a noticeable wrist deformity.  When a bone penetrates the skin and becomes visible, this is known as an open or compound fracture. Pain from a wrist fracture also depends upon severity, but it's usually described as very sharp with movement, and deep and achy without movement. The severe pain of wrist fractures tends to increase during gripping or squeezing of the hand, which is not often the case with wrist sprains. Wrist fractures usually cause more symptoms in the hand, such as stiffness, numbness or inability to move the fingers, in comparison to wrist sprains because there is a greater chance of nerve injury/damage with fractures. Furthermore, there can be a grinding or crunching sound when moving a fractured wrist, which doesn't occur with wrist sprains.  Pain from a wrist fracture is often (but not always) preceded by a "cracking" sound or feeling. In contrast, only Grade 3 sprains can produce a sound or similar sensations, and that's sometimes a "popping" sound as the ligament ruptures. As a general guideline, wrist pain from a fracture will get worse at night, whereas pain from a wrist sprain will plateau and not flare-up in the night if the wrist is immobilized. As noted above, a day or two of rest and cold therapy can make a big different in a mild-to-moderate...

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