Thanks for the responses. To answer some questions from respondents:
- I don't require support, but significant compression of the muscles around the knee. The idea is to squeeze fluid out of the knee because it inhibits muscular performance.
- The hole in the knee cap is to prevent downward pressure on the cartilage/bone in and around the kneecap.
- Physical therapy has been tried, is ongoing, and the PTs have suggested a compression sleeve.