Generally, you cannot sue your employer when you are hurt on the job. Workers' Compensation is the sole remedy for work related injuries. Under workers' compensation, an employer will pay medical expenses and lost wages incurred as well as a lump some if there is a permanent disability in exchange for not being sued.
Some workers can sue their employers for certain intentional acts or harms that may have caused injury to the employee. The employer's act must be intentional, outrageous, and not accidental. When an injury is not considered an accident it is not covered under the Workers' Compensation Act.