The Mariners said Friday that the right-hander met with Dr. Lewis Yocum in Los Angeles to get a second opinion on a diagnosis by team physician Dr. Edward Khalfayan. Yocum and Khalfayan conferred and have prescribed one month of rest, followed by a throwing program.
Aardsma had surgery on his left hip in January by Dr. Marc Phillipon and opened the season on the disabled list.
While on a rehab assignment at Triple-A Tacoma, he experienced discomfort in the elbow.
The 29-year-old totaled 69 saves the past two years for the Mariners.