Injuries limited veteran reliever Liam Hendriks to just 13 ⅔ innings over the term of the two-year, $10 million contract he signed with the Red Sox last spring. As he enters the open market again, he’ll have another rehab process to overcome.

Hendriks underwent elbow surgery Monday — a successful right elbow ulnar nerve transposition with posterior interosseous nerve release, according to the Red Sox. The procedure was performed by Dr. Keith Meister at the Texas Metroplex Institute for Sports Medicine & Orthopedic Surgery in Arlington, Texas.

Hendriks, who turns 37 in February, spent his first season with the Red Sox rehabbing from Tommy John surgery, only to be shut down last September in the middle of a rehab assignment because of persistent tightness. He arrived in spring training f

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