1
I need to have knee surgery.
To sign this, you can point to your knee or sign 'knee', followed by the sign for 'surgery'. Alternatively, you can perform the 'surgery' slicing motion directly on your knee to visually show exactly where the procedure will take place.
2
The surgery was successful.
Begin by signing 'surgery' using the standard motion on your non-dominant hand. Follow this immediately with the sign for 'success' (using two index fingers pointing forward, then curling back up near the head) to indicate the positive outcome of the medical procedure.
3
He is recovering from heart surgery.
First, establish the location by signing 'heart' (tapping your middle finger over your heart). Then, sign 'surgery' either in the standard neutral space or directly over the heart area. Finish the sentence by signing 'recover' to show his healing progress.