The rake swings up and injures you. The neighbour did not take proper care. He should not have left a rake lying on the garden path where it could injure someone. He was negligent. You can, therefore, recover compensation for your injury.
Compensation can include medical expenses and also any wages lost through being off work.
Take another example. You are waiting for a bus in a queue. The bus arrives and the person behind you pushes you. You fall and injure yourself. You can recover compensation from the person who pushed you.