Kansas City Royals right-hander Nate Karns will undergo season-ending surgery next week to remove a rib that's causing nerve pain in his forearm, the team announced Saturday.
The thoracic outlet surgery will be performed by Dr. Gregory Pearl on Wednesday in Dallas, according to a report by MLB.com. Thoracic outlet syndrome is caused by compression of nerves, arteries or veins in the area between the lower neck and armpit area.
Karns was off to a promising start in his first season with Kansas City, posting a 2-2 mark with a 4.17 ERA. The 29-year-old was placed on the disabled list May 21.
Karns owns a 16-11 record with one save and a 4.37 ERA in 63 career appearances with the Washington Nationals, Seattle Mariners, Tampa Bay Rays and Royals.