Your hand has fascia, a fibrious layer that connects skin to muscle. When the fascia thickens and tightens over time, the finger(s) may be pulled inward towards the palm resulting in a flexion contracture as the finger(s) lose mobility. Eventually the finger(s) cannot be completely straightened.
The forearm is between the wrist and the elbow, and it has two bones: the radius and ulna. A forearm fracture may result from any fall, participation in contact sports, or motor vehicle accident. Lastly, you may find that the term fracture and break are used interchangeably in the healthcare field as they mean the same thing.