Americans are living longer and in better health. This means they are more likely to need a major joint replacement as they reach their 80s. Joint replacements are available for the shoulder, hip, or knee.
These operations do put older adults at increased risk of problems.
Studies of 80-year old (and older) adults compared to younger adults show there is an increase in the number of serious problems that occur. But the overall rate is low, and it's more likely to happen in elderly patients with other health problems.
Results should be good if your grandmother is in good health and the doctor has approved the surgery.