It makes me wonder if whatever happened to your knee was a result of DCS or that it was maybe something else that also just happened to get better in the hyperbaric chamber... Did you do anything else on the second day that could explain your knee? Did you have any other symptoms of DCS besides the pain in your knee?
R..
This is what I was thinking as well. Hyperbaric treatment of injury (HBO) is readily available, and has been accepted as a therapy for chronic pain relief. Without the results of a doppler ultrasound examination, the diagnosis of DCS is really just a hypothesis yes?