There was some concern that Blum might need microfracture surgery, a more serious form that would have kept him out for six to nine months.
"When they got in there, it was actually better than the MRI showed," Blum said. "There was more cartilage in there. Other than not having to have any surgery, this was the best-case scenario."
Blum, who has been out of action since early in Spring Training, should be able to start a rehab assignment in four or five weeks.
"I was extremely relieved," he said. "It already feels better than it did before the surgery, so I'm happy about that."