Hi Iam2
I couldn't make the retreat like Jeff but have been visualising that I'm there with Master Lin and everybody, experiencing the amazingly high levels of energy and healing powers that I experienced when I did attend the retreat in 2004 every time I meditate since last Saturday (Australia time) - you could do the same - it makes a huge difference and hopefully it will help your knee as well - I'm also sending energy.
Love
Jetay