Hamilton was moved to designated hitter on Monday and stayed in that same spot for Tuesday's game against the Royals. He had his second cortisone shot in the knee this season at the beginning of August after he said the knee gave out on him right as July ended.
"The first shot lasted two months and the second one only lasted a month," Hamilton said Tuesday. "The biggest problem is running in the outfield."
Hamilton said he will get a shot of the lubricant synvisc, which is not the same thing as a cortisone injection, in the knee after Tuesday's game and see how it feels. He also had the lubricant injection in April. He is not planning an MRI at this time.
Hamilton said his swing, one that has produced to the tune of a league-high .359 average with 31 homers and 95 RBI, has some discomfort, but that he can work through that.
He's making sure to take very few swings other than in a game and will limit his time at batting practice to give the knee a break. His concern is the ability to catch balls and roam the outfield at full speed.
"It's not a gradual thing," Hamilton said about the pain in the knee. "It just comes and it's here."
Rangers manager Ron Washington said that Hamilton would be given the day off on Wednesday. The Rangers don't play Thursday, and he would return to the lineup on Friday.
Hamilton said he hasn't ruled out a third cortisone injection, though normally only two per season are recommended.
"We won't do anything that would jeopardize my career long term," Hamilton said. "But if we can do something to help it, we will."
Richard Durrett is a reporter for ESPNDallas.com.