To sit down, I just sit on the board in the water with my feet off the sides, have the boat start to drag you, put your feet up on the nose of the board, and say go.
But if you can't bend your knee much I'm not sure how comfortable it'll be to sit on the board. Especially if the nose starts bouncing up and down on ya.
Good luck. Hopefully you'll get back to fighting form soon.
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