Are you sure its 30%? Take the MEB and run, you will get your annuity immediately and TRICARE, the VA may rate you higher and you could potentially make more money.
Scroll down to hip replacement, looks like 30% in the end, it also says TDRL, which means they can put you back on active duty if you get better.
https://www.militarydisabilitymadeeasy.com/hipandthigh.html