I never put anything concept-heavy in Anki. The card would slow down my reviews too much, and flash cards are not good for concepts.
I would talk through the concepts with my study group once to twice a week, or try to explain it to my husband (he is a very patient man) and if I could explain it to an artist like him, I felt I understood it well.
If I was having a really tough time with a concept, I would try to find a real-world application to bring it to life - like a patient vignette, pubmed article, or a practice question stem and answer.