Yes, you can. But you have to prove that your employer was legally liable for your accident because they failed to protect you from injury. It may be that they did not provide you with appropriate equipment, such as a hard hat or harness. They are required by law to risk assess your workplace and provide you with a safe system of work, training and safe equipment and co-workers. So, if you fall because the ladder you fall from was defective, you may also have a claim against your employer for supplying defective equipment for you to work with.