NFL teams playing risky game with joint practices

Joint practices have become a pretty common trend in NFL training camps, and every time they happen one of two things seems to take place on the field.

There are either a lot of fights, or a lot of players getting injured. Sometimes both. 

The whole concept behind the joint practice is simple. Instead of having a normal training camp practice where teams compete against themselves, they will bring in another nearby team and scrimmage against them. It's a chance for players to get reps against players that are not their teammates without it having the same pressures and risk of playing them in a preseason game.

But as several teams are finding out recently there is still plenty of risk involved, and it's only a matter of time until somebody gets a serious injury that limits them for a significant portion of the season.

Just this week alone there have been several notable injuries to come out of these joint practice sessions.

A few examples of them. 

• Tennessee Titans wide receiver Treylon Burks sprained his LCL in a joint practice with the Minnesota Vikings that will keep him off the field for several weeks.
• The Detroit Lions watched two of their top wide receivers -- Amon-Ra St. Brown and Jameson Williams -- leave a joint practice after suffering injuries against the Jacksonville Jaguars. 
• Terron Armstead, a four-time Pro Bowl left tackle for the Miami Dolphins, had to leave a recent joint practice with the Houston Texans on crutches. 
• The Patriots had several players banged up in a "chippy" practice with the Green Bay Packers this week.
• Not even coaches are safe from the chaos as New York Jets cornerback coach Tony Oden found out.