can I claim compensation for falling of scaffolding and breaking my arm?
If you can prove that the company was responsible i.e. the scaffolding was not safe, then yes. If it is proved that you ignored instructions, signage preventing your access or training, then no. The company cannot be held responsible for your stupidity, if for example, you decided to climb over a guardrail rather than leave the scaffold at the proper access points. In this case, you would get nowhere with a claim. If the scaffold was missing guardrails where it should have them, then quite rightly the company in charge of the site on which the scaffold is erected is responsible.
