What he's learned some 15 months later is that recovering from the procedure to remove the tendon from his left hamstring that the surgeon used to repair the elbow would take longer.
"It took longer to rehab from that than it did the elbow," said Parker, who was drafted by the D-backs in the first round of the 2007 First-Year Player Draft. "We're just strengthening it right now, building the strength and what not."
The leg does not bother him when he plants to pitch, but at times can bother him when he has to make quick sprints or agility-type drills.
While most people have the palmaris tendon of the forearm used to repair the elbow, about 14 percent of the population does not have one. Parker was one of those, so they used a tendon from his hamstring instead.
"Throwing wise, I feel good, and that's all that matters," Parker said.