Texans' Nick Martin, Christian Covington leave practice with injuries

Texans rookie center Nick Martin limped off the practice field Thursday morning under his own power and was later carted off to be examined by trainers.

Martin appeared to injure his right foot or ankle when he was thrown to the ground during a joint practice session with the New Orleans Saints.

The fact that he was able to put weight on his foot at all is typically a positive sign with lower body injuries.

Meanwhile, defensive lineman Christian Covington left practice early with his pads removed after sustaining an apparent upper body injury with an ice pack applied to his shoulder. Covington later returned to the practice field after being examined, but didn't practice anymore. He appeared…