Will Previous Knee Surgery Affect Liposuction?

I would say if you have recovered uneventfully and if you were one of my patients, I would feel comfortable performing liposuction on the thighs.
Make sure you see a board certified plastic surgeon for your surgical procedure.
Good luck.

As long as the incisions have healed on your knees and you don't have swelling that could be bothered by the compression garment after liposuction you could probably undergo the thigh liposuction with no concerns of it being interefered by the knee surgery. Do check with your orthopedist, though, prior to booking the liposuction.

 If the knee surgery was endoscopic  it should not affect your liposuction and probably not even if it was opened. You can ask your surgeon when he evaluates you.

The knee surgery itiself if the scar is located over the "knee cap", should not interfere with the mechanical performance of liposuction. However, you may experience prologned swelling due to surgical scarring of the veins and could place you at higher risk for a blood clot of the calf veins. Preventative measures should be used in any prolonged surgery or for prolonged immobilization under general anesthesia.

Liposuction will not affect the inner knee but is associated with swelling which is treated with compression garments. The swelling may be greater based on the location and the length of the knee surgery incisions. But there is no reason why you could not have liposuction.
Dr. P. Aldea