Quite common in post menopause women. Diet and weight bearing can stave it off. But those in wheelchairs are at great risk. My ex had a spontaneous spiral fracture of her tibia. She had been diagnosed via a DXA in 2014 but never did the drugs.

Man made or not a fracture at age 60+ can put you in a wheelchair with an inevitable decline. Get the DXA to check but beware of bis-phosphates.