With the NFL season now in full swing, one unique injury is shaking up the league: turf toe.

Two star quarterbacks -- Brock Purdy of the San Francisco 49ers and Joe Burrow of the Cincinnati Bengals -- have suffered the injury in the first two weeks of the season.

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Purdy is expected to return relatively quickly, while Burrow had more significant damage that will require surgery.

So, what exactly is turf toe? And how long does it typically take to heal? Here's what to know about the injury:

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What is turf toe?

According to the Cleveland Clinic , turf toe is an injury that affects your big toe joint.

Medically known as a metatarsophalangeal joint sprain,

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