I was skiing a short section of a bump run quite slowly on March 2nd. I lost my balance a little and I stopped, facing uphill, with my skis spread out, tips wide out, tails closer together. I stayed in my bindings, set at DIN 7, chart setting is 6 1/2. I was skiing on X-Wing Blast skis with the Salomon bindings.
Just as I stopped, I felt a moderate pain on the inside or medial part of my right knee. I stood on the hill for a couple of minutes trying to assess if I had any real injury. It felt like I had stretched a ligament, but my knee felt stable, so I figured that I had not completely torn a ligament, so I continued skiing, but stayed on the groomers.
Later at night, I had some pain with movement and swelling in my knee so I iced it regularly for about a day and a half, and then warmed it with a heating pad regularly for several more days. My own assessment was that I had slightly strained my MCL. I stayed off skis for two weeks, but I did play doubles tennis during that time, but avoided fast accelerations or directional changes.
When I started back skiing, I stayed on groomers for a couple of days to see how my knee felt, and then gradually was drawn back into the bumps like a magnet, although I was more cautious for about the next dozen days' skiing spread out over five weeks.
I went to my doctor when I returned to Toronto after the ski season, and he confirmed that I did in fact slightly strain my MCL. My understanding is that a strain does involve some slight tearing of the ligament fibres, but that the ligament can heal itself, although this healing happens at a slower rate because of the limited blood supply for that tissue.
He just advised me to listen to my body to assess my level of recovery and how hard to play tennis. I gradually improved and could push myself a little harder and by about 4 months later in July, I felt I had recovered about 80-90%.
I feel lucky that I did not do any more damage. I have seen several ACL injuries which occurred at a very slow speed while losing balance. My own theory is that ski bindings work better with some speed, and tend to not release as consistently under some situations of little movement.