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I snapped my ACL over in Canada and was given a brace very similar to the one that @Stonehedge linked to - effectively hinged metal rods on either side of the knee joined by a neoprene sleeve. Was told by the consultant that her partner always wore his whilst ice skating etc.
Wore the brace for the first few trips for added stability / safety but I don't know how much good it would do in a proper smash - it did seem to help support the knee, so helped conserved knee stability/strength a bit longer, which i guess is the point, I don't think a simple neoprene sleeve would have had the same effect but YMMV. Even with the robocop brace, it certainly did not stop me still being very conservative about what the knee could do - it won't replace proper strength / stabilisation prep (which i'm sure you've been doing).
I ruptured my ACL running out of talent earlier this year, my physio says to wear a brace on that leg if I ski - I know nothing about these things, does anyone on this thread know what’s good and what’s not?