I did some research before my surgery, five years ago, and at that time, a mitral valve could only be repaired via front open heart surgery because of its placement in the chest.
I found knee surgery (I had severed ligaments) to be way more painful and debilitating.
Good luck. I wish you the best.

I had AFIB, severe left atrial regurgitation (mitral valve not opening properly), no comorbidities. Valve problem caused it all; the valve problem was caused by a dental procedure that led to a gum infection, that went to my heart valve. It’s not that uncommon from what I understand.
Everyone is different, but here is my experience for what it's worth. I had mitral valve repair, ablation, and LAAC at 78, two years and 6 months ago. No more AFIB (it can work permanently). I exercise and eat smartly (low in calories, sugar, salt, and caffeine). I got off of Eliquis after four months by wearing a heart monitor for 30 days to be sure AFIB was gone. I had to push my cardiologist to put me on the monitor. My last vital stats while sitting were 119/68, heart rate 68. I have also weaned myself off of 12.5mg metoprolol daily and 81mg aspirin daily. I Read a recent JAMA article that said low dose aspirin causes brain bleeding over time. Now it is recommended only for stroke and heart attack victims as I understand it. I have also read that metoprolol interferes with sodium and sugar levels. Too low an amount of sugar or salt can cause dizziness as I read it. Vitals and alertness are better than ever. Daily, I do take a magnesium glycinate supplement containing 29% of RDA. Pure Encapsulations is the best brand I have found. I have read that magnesium and moderate exercise help folks to stay out of AFIB. I had a great surgeon at WakeMed in Raleigh, Dr. Boulton, who did all of the heart stuff. That was key of course. He also supports magnesium supplements. Overall, I feel extremely fortunate.
Regards,
Sagan