Greg Ostertag will undergo surgery later this month, but it's not the standard NBA offseason scope-the-knee procedure. In fact, the operation may endanger the Utah Jazz center's basketball career, not extend it.
   
Ostertag, who has played seven seasons for the Jazz, will have a kidney removed June 27 so it can be transplanted into his sister, a diabetic whose own kidneys failed three months ago. Ostertag was evaluated Wednesday by doctors at Baylor Medical Center in Dallas, where the procedure will be done.
   
"I'm nervous," Ostertag, told The Dallas Morning News. "There is always a chance that I won't come out of it, or that something will happen later, an infection or something. But the chances are slim. I don't think about it much."
   
He didn't think about it in March, either, when his only sibling, 26-year-old Amy Hall, told him that he was the best donor candidate for a transplant that had become urgent. Ostertag immediately agreed, and "he has never thought twice about it, never looked back, never said 'I shouldn't be doing this because it could mess up my career,' " Hall told the newspaper.