Ravens outside linebacker Adrian Hamilton went down with an injury after landing awkwardly during team minicamp today. He was on the ground for several minutes in obvious pain.
After being attended to by trainers who were concentrating on his upper body, Hamilton eventually walked off under his own power.
He was holding his lower back with his right hand.
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Later, coach John Harbaugh said it wasn't a major injury and was muscular in nature.
"It doesn't seem serious," Harbaugh said. "It was all muscular."
Hamilton initially was concerned that it was a major injury, but it's more of a muscular contusion.
The Ravens practiced indoors because of inclement weather today during the final day of a mandatory minicamp.
Meanwhile, Pro Bowl defensive tackle Haloti Ngata remains sidelined as he works his way back from a sprained left knee suffered during the Super Bowl.
Ngata isn't doing much in the way of activity at practice today after working on the side on conditioning in previous workouts.
Tight end Ed Dickson has a strained groin, but it's not considered serious.
"We're resting him," Harbaugh said.
Safety Omar Brown isn't practicing with an undisclosed injury
Also not practicing: offensive guard Marshal Yanda (shoulder surgery), defensive lineman Kapron Lewis-Moore (knee), nose guard Terrence Cody (hip surgery) and offensive guard Antoine McClain (foot surgery).
Inside linebacker Arthur Brown (sports hernia surgery) has been working into full-team drills.