Is it even worth trying to claim my back injuries?

Currently rated 80% had some issues come up over the years since my rating and putting in a new batch of claims. I’m thinking of trying to get my back issues secondary to my already 40% rated knee injury. But the thing that complicates it is that I was in a car accident in 2020 which was treated by the VA and notated about the car accident. I had some pain prior to the accident but never documented. Do yall think it’s worth a try to get rated for it or think they will write it off as all coming from the accident?