Bow-legged questions

Hi again, Gabrielle – When I stand with feet together, my knees don’t meet. There’s about an inch or more between them. When I squeeze them together and open my hips in the set-ups, they still don’t quite meet. The main problems I’m having are – lack of balance when I position my foot straight forward as directed in the one-leg standing poses; another problem is in part 1 of the head to knee pose while standing on one leg – i.e., lifting one knee and curving the back over, I feel intense pain in the standing knee. I’ve tried several adjustments and the one that seems to help relieve it is to hold my raised knee up by itself without keeping it up with my hands. I read that in the Master Class book. I also have trouble locking my knee – the alignment just doesn’t feel right. Are there any adjustments I should make for my bowlegs? Other physical characteristics: I’m 60, 5 foot 3 inches tall, weight 140. I’ve been doing Bikram yoga for almost five months – 2 to 3 times a week. I’m learning a lot from the Master Class book!!
Thanks very much, Megan