Yeah like OR said, start light and work up slowly.
When people think of lifting weights, they think of ripped abs, massive biceps and whatever else but people forget one of the most important benefits of lifting; which is to normalise the body.
Some old injuries will always be present, most heal that is very dependant on what the injury is. But what is absolutely certain is that if you build up the musculature surrounding that injury you can begin to get a proper range of pain-free movement back again.
Being injured or not isn't an on or off switch. If it's something terminal, the body can correct itself enough that on a day-to-day basis you won't really notice the problem. Weight lifting and the building up of muscle around the area is key here.