from what i know about MEB is that there is only 1 injury that will disqualify you from the military. You named a couple injuries but i dont think they will add them up. I had my IPEB and now going to formal MEB next monday. Check the VASRD for how they will rate you. good luck
i had my surgery 1 1/2 ago for herniated disc for L4-L5 L5-S1. surgery didnt help much. Acutally got worse with new pains that developed. Got 10% with severance pay from informal for DDD. Denied that and now going to formal. My formal is next monday which my lawyer is going for 40%...