Employee was placing a jaw block into the slide table of a sonic rig & felt a strain in left bicep. Seen at a clinic & was released to Full Duty with no treatment or diagnosis. MRI was done on 1/24 & results were reviewed at F/U visit on 1/29. 1/29 diagnosis of torn bicep received. EE remains Full Duty with no treatment to date & has an Ortho eval on 2/05/24.