At the end of the 1981 season, Detroit gave Fidrych his outright release and he signed as a free agent with the Boston Red Sox, playing for one of their minor league teams. However, his torn rotator cuff, still not diagnosed and left untreated, never healed. At age 29, he was forced to retire. Fidrych went to famed sports medicine doctor James Andrews in 1985. Dr. Andrews discovered the torn rotator cuff and operated; still, the damage already done to the shoulder effectively ended Fidrych's chance of coming back to a professional baseball career.