According to The Hand Center of Western Massachusetts, an arm or wrist cast may be worn while playing football at the discretion of an individual, his parents, his coach, and most importantly, his doctor. However, playing football, a high contact and forceful sport, runs a high risk of re-injury.
If a player chooses to participate in a contact sport with a cast, protection for his cast and for other players exists. For example, a product called The Cast Protector is a pad that surrounds the cast and is held with Velcro strips. Though it does not wholly prevent injury, it is approved for use in high school football, according to the product website.