Horwitz said Wednesday that the surgery he underwent last week was to repair the extensor tendon in his right thumb, John Perrotto of PittsburghBaseballNow.com reports. He's expected to face a recovery timeline of 6-to-8 weeks.
The left-handed-hitting Horwitz's procedure was designed to address chronic symptoms with his wrist, but the surgery itself was actually performed on the thumb of his throwing hand. In any case, Horwitz's projected 6-to-8-week recovery timeline could keep him out of action for most or all of spring training and force him to open the season on the injured list. If Horwitz is shelved to begin the campaign, Pittsburgh could turn to Jared Triolo, Billy Cook or Bryan Reynolds to pick up starts at first base early on.