Tony Gonsolin and Recent Tommy John Surgery Trends

Between Shohei Ohtani, Félix Bautista, and now Tony Gonsolin, the fragility of ulnar collateral ligaments has been an all-too-frequent topic of conversation within the past week. Gonsolin, in case you haven’t heard, is headed for Tommy John surgery on Friday, while we’re still waiting to hear whether the UCL injuries of Ohtani and Bautista are significant enough to merit going under the knife. Between that trio and the Rays’ Shane McClanahan going down earlier this month — and the fact that neither Gonsolin nor McClanahan are the first members of their teams’ rotations this year to need such surgery — it certainly feels as though we’re dealing with a lot of Tommy Johns lately, so it’s worth cutting through the numbers.
First, however, let’s spare a few paragraphs for Gonsolin and the Dodgers. The 29-year-old righty was coming off an All-Star season in which he posted a 2.14 ERA and 3.28 FIP in 130.1 innings, and owned similarly impressive career marks (2.51 ERA, 3.45 FIP) despite his intermittent availability due to injuries, which included a six-week absence near the end of last season due to a forearm strain, and just two appearances totaling 3.1 innings afterwards, one of them a four-out start in the 2022 Division Series. After spraining his left ankle during fielding drills in early March, he was playing catch-up and never seemed to find a comfort zone. He began the regular season on the injured list, finally debuting on April 26, and while his run prevention numbers looked good in the early going, his peripherals told another story, and his average fastball velocity was down. On June 11, manager Dave Roberts alluded to some health issues with Gonsolin, noting that his between-starts recovery “hasn’t been great,” and wondering if he was having trouble getting loose or pacing himself. In his next start two days later, Gonsolin threw six shutout innings but averaged just 91.1 mph with his four-seamer, two full ticks below last year.
To that point, Gonsolin had a 1.93 ERA but a 4.25 FIP, and soon he began to get roughed up on a routine basis. Over his next seven starts, he allowed four or more runs six times, producing a 7.25 ERA. Following a 3.1-inning, five-homer, 10-run stinker on August 18, Gonsolin’s second bad start out of three, Roberts told reporters that Gonsolin had been pitching through an unspecified “arm issue” for four to six weeks and would likely head to the injured list. On Sunday, the Dodgers acknowledged that surgery was an option, and on Monday it was revealed he’d undergo Tommy John on September 1. Read the rest of this entry »