Having my boots (well, my R boot) aligned by Diana.
35 years ago I over-stressed my R knee bicycling above my fitness/training/knowledge level. Since then, when skiing challenging terrain, I hesitated before committing to a new L turn because I didn't quite trust that knee. On ice my R ski chattered more than my L. My R hand tended to drop while my L never did. I had trouble making certain PMTS movements when the R leg was the stance leg. Skiing in heavy snow could cause R knee pain if it experienced any twisting. I suppose this encouraged learning to turn without rotation, but it was still pain.
Dumont CO - February 2015 - 45 minutes of in-shop evaluation - one shim - on snow evaluation over the next week.
All the R knee symptoms disappeared INSTANTLY. The instability vanished. I felt this immediately in the shop. The ski chatter is gone. The pain is gone. Even the hesitation at the top of a scary L turn is gone. I now make PMTS movements equally badly on both sides, as confirmed by Diana and HH on snow.
I'd been alignment checked by a dozen bootfitters over the years. Several knew about the R knee problem. None of them came close to understanding my feet, legs, movements and true alignment needs. One visit to the HSS shop was all it took.
As to my skiing... as I'm new to PMTS, let's say it's a work in progress.