Elderly dementia parent living in nursing home won't sit still, keeps getting up and falling, any ideas to help?

My parent is 91 yr old, frail, uses a walker, with bad hip-replacement. He has dementia and constantly wants to get up and walk around. He has fallen 2 times recently and fractured his clavicle bone. He gets angry and won't follow directions from the staff at the nursing home. Facility doesn't allow restraining him, so what can we do? We want to keep him from falling and fracturing his hip, and be more cooperative.