Joe Mauer hasn't done any serious lifting or tough conditioning exercises to get in shape for spring training on orders from his surgeon, after he had kidney surgery at Mayo Clinic on Dec. 22.
Publicly, Twins officials won't admit any concern about the All-Star catcher and two-time American League batting champion being 100 percent healthy in time for the start of the season. But then you keep hearing behind the scenes that there is some worry.
Mauer won the batting title with a .328 average, even though he had serious back pain for the last six weeks of the season. Examinations revealed the former Cretin-Derham Hall star was born with a small abnormality in one of his kidneys, according to Twins physician Dr. John Steubs.
"At the end of the season we were going to just let him rest," Steubs said. "And he rested for two, three, four weeks, and it didn't get better. Then we did the studies that we did and found this problem, and he elected to get that taken care of.
"So, at the time he had this done, we weren't sure that it was the reason for his back pain. The rest of the studies, the rest of the MRI and everything else we did of his back looked just fine, and we found this little abnormality in his kidney."
Steubs said Mauer saw two or three specialists before he had anything done, but the recommendation was that he get this taken care of so it wouldn't be a long-term problem.
"Hopefully it also will clear up any problems he's had with his back," Steubs said. "Because your kidneys sit in the back area there, and we don't know what role this has played in any kind of backaches he's had over the years.
"Joe says he thinks that [the surgery] has corrected that, so it hopefully will take this kind of nuisance back pain out of the loop."