Final answer:
Your grandmother probably suffered from osteoarthritis, which is a common cause of hip disability in the elderly, leading to the necessity of hip replacement surgery to restore mobility and alleviate pain.
Step-by-step explanation:
Your grandmother likely suffered from osteoarthritis, a degenerative joint disease that is the most common cause of hip disability in elderly individuals.
Osteoarthritis can lead to significant pain and loss of joint mobility, making daily activities difficult. Hip replacement surgery, or total hip arthroplasty, is a common treatment to relieve these symptoms and help restore mobility.
Additionally, elderly individuals are prone to hip fractures that may be caused by weakened bones due to osteoporosis, leading to complications such as pneumonia, pressure ulcers, and blood clots if immobility persists during the healing process.