When Mets starter Jacob deGrom takes the mound, he is one of the most dominant pitchers in baseball.The problem last year was keeping him on the mound.The 33-year-old had a 1.08 ERA in 92 innings over 15 starts last season, but missed the entire second half with concerning elbow issues. Prior to the July-September injury stint, deGrom had dealt with an inflamed lat, a sore back and neck, plus a shoulder issue.The saying among many medical staffs is injuries beget injuries and deGrom is a classic case of that.When a pitcher's throwing motion is off, even in the slightest way, it can add stress to other areas. Those previous minor injuries likely contributed to the inflammation around his UCL that was revealed on MRI in late July.The eight-year veteran does have a history of ulner collateral ligament reconstruction as he underwent Tommy John Surgery in 2010, when he was in the minor leagues.Although most pitchers do well after prolonged rehab, deGrom seems to have some lingering issues now.At this point, the key here is what led to the right forearm soreness and eventual inflammation around the UCL. If it only requires a simple fix of mechanics, deGrom should return to his old form. The worst case scenario would be for the elbow issues to persist this season and require surgery.In any case, the ProBaseballDocs don't have a firm diagnosis on what caused deGrom's injury woes last season.It is certainly possible that he can rehab and put these issues behind him but it is not ruled out that he will continue to have problems this season.His Sports Injury Central health score entering the season is 68, reflecting caution regarding his health.Fingers crossed that he can play effectively and return to the Cy Young-level he was at in 2018 and 2019 for the Mets.But at this point, there is no guarantee of that.Until the ProBaseballDocs see how he performs, he will carry a lower SIC score, indicating our worry for injury recurrence.Use appropriate caution in your fantasy and dynasty leagues.