I'm finished with my knee brace from meniscus repair. This brace both locks and has adjustable range of motion. Was worn for about 6 weeks and would make a nice backup brace. I believe it's "one size fits most" and it's currently set up for a 5'11" male of average build.
For reference:
https://www.dme-direct.com/donjoy-x-rom-knee-brace?