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Hi and welcome.
You can take your mother to pain physician and he can offer her steroid injection or local anesthetic injection around and into knee joint it can help relieve her pain and inflammation for about 6 months to 1 year. There are hyalauronidase injections as well which can be helpful when injected into knee joint. Physiotherapy would help a lot.
Let me know if you have further questions.
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Wish you good health.