It remains to be seen who will fill the closer's role in Uehara's absence. Junichi Tazawa and Jean Machi are candidates.
Uehara is expected to make a full recovery and is under contract with the Red Sox for 2016 at $9 million.
Aside from a slump late in 2014, Uehara has done a solid job in his three seasons as closer of the Red Sox.
Uehara made 43 appearances for the Red Sox this year, posting a 2.23 ERA while converting 25 of 27 save opportunities and striking out 10.5 batters per nine innings. Initial X-rays were negative, but Uehara later flew back to Boston to undergo more tests.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.