For those with subscriptions to The Athletic, this is a nice article about Jesse Hahn and his return to KC after having a different surgery to repair his UCL.
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An alternative to Tommy John surgery? Royals’ Jesse Hahn returns to majors after having new UCL-repair procedure
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A select few doctors had performed a new procedure in recent years called “primary repair with internal brace,” which involves repairing the ligament with strong sutures that serve as a scaffold and can cut the Tommy John surgery rehab time in half. The only current professional pitcher reported to have undergone the operation is Texas Rangers minor leaguer Seth Maness. As Hahn was aware, Paletta had performed that surgery.

After looking at the MRIs, Paletta sat in the room and told Hahn he could be a candidate for the procedure, but the surgeon wouldn’t know for sure until he digs into the patient’s arm, makes an incision into the ligament and dissects the tissue. Hahn, wanting to pitch again in the majors for those family and friends who have followed this career and for his own love of the game, agreed to sign a waiver, allowing Paletta to operate on his arm days later in the best way Paletta saw fit.