Thanks for posting your query.
is common at your age. Please continue to do the exercises. You may add calcium supplements
to your medications list. Take one tablet every day after food.
The need to undergo a knee replacement
surgery can be decided upon by looking at the extent of the lesion, underlying bone pathology and the extent of bone destruction.
A knee replacement surgeon will be able to help you better on this.
Hope this helps.
Wish you good health.