Sorry this has taken so long to get answered. I hope you were able to pursue some good walking over the summer. The key to the Chi techniques (walking or running) is good alignment. If you have pelvic instability, that’s going to affect how your knee tracks. Without seeing you walk, I can only guess that might be contributing, as it is so common. The first lesson everyone should start with is the posture lesson - take it slowly and really feel what is being taught in YOUR body - foot alignment, tall lengthened spine, core stability, and upper body balanced over lower body. When you feel that and practice that throughout the day, you may find that your knees move easier with less pain.
If you kept at it, let us know how it’s going. If you gave up, there’s no time like the present to start anew!
Certified Chi Running and Chi Walking Instructor