Is there any alternative to knee surgery replacement and rotator cuff. both of them they say i need. any other alternative to surgery for these two?

Usually alternatives: Symptoms in these joints at your "experience" level are usually due to chronic degenerative changes life style changes ( diet, exercise, weight control, etc) can make significant differences. Physical therapy can usually be beneficial. Oral anti-inflammatories(if you can tolerate them). Joint injection sometimes help. Surgery is not the first choice but if all else fails it can make big changes.

Knee Replacement: Knee replacement surgery should only be done to help relieve knee pain caused by arthritis. It should also only be done after you have tried non-operative treatments. If non-operative treatments like injections, medicine, physical therapy aren't working for you anymore that only thing left is knee replacement. However, only have the surgery if you feel the pain is bad enough.