Kevin Youkilis was placed on the disabled list yesterday with a lower back issue, and because it’s the second episode in about seven weeks, you have to wonder what the Yankees will get out of the 34-year-old corner infielder. Youkilis was on the DL from April 27 to May 30 with a lumbar spine sprain. Though he said the back wasn’t the reason he didn’t hit since returning to the lineup, when he woke up yesterday with numbness in his legs, he called the trainer Steve Donohue. “I want to play, this stinks,’’ said Youkilis, whose spot on the roster was taken by outfielder Thomas Neal, who started in right field last night against Angels lefty C.J. Wilson at Angel Stadium. “But I have to worry about my health.’’ Youkilis will be examined Monday by back specialist Robert Watkins. As for hitting .146 (6-for-41) in the 11 games since coming off the shelf, Youkilis didn’t put it on the back completely and said it wasn’t bothering him until yesterday. “It was a lot of different reasons. Sometimes you go through ruts,’’ he said before the Yankees’ 5-2 loss to the Angels last night. “I don’t think it’s the sole reason.’’ Asked if he was worried, Youkilis said, “You always worry when you have no feeling. You think about it all day and then the next thing you know they tell you that you need an epidural.’’ Manager Joe Girardi, who battled back problems late in his catching career, is concerned.