When S. started doing yoga, she wasn’t able to bend her knees, because she was in so much pain. We worked on lifting the kneecaps in poses where the knees need to be kept straight, like dandasana, uttanasana, trikonasana, and prasarita padottanasana. This strengthened the ligaments in her knees, and as you can see, standing on one leg in ardha chandrasana is no big deal for her.