Lab tech lifted bucket (approx. 20 lbs.) about 36 inches over a rail to dump into a dumpster felt a pop. EE refused medical care at that time, iced and monitored it. Next day EE stated it felt better. On 10-26-21 EE stated it wasn't getting better and wanted to see a Dr. EE was given restriction and Tylenol. On 11-24-21 MRI was performed. Surgery was scheduled for 12-16-21.