I hesitate to share this, as it might be a “worst case scenario” for you, but it still might be useful information.
Several years ago, my mom had a total hip replacement. About a year following surgery, she tripped over the dog in the house and fell. The replacement punched right through her acetabulum.
She did not have good quality bone–she’d had the replacement because her pelvis was riddled with metastatic breast cancer–and perhaps that’s why she had such a catastrophic injury from simply falling to the ground in the house. After helping her through that, though, if I had to have a total hip replacement, I would be very uncomfortable riding for fear of falling, and, at the very least, would GRILL my doctor on the possibility of something similar happening to me.