Do you feel like your knees cave inwards on your way down and up from a chair?
You may be experiencing what we call a knee 'valgus'. This is where your knees come in towards the mid-line as you squat down.
The reason for this is the lack of external rotation mechanism from your hip joint.
What the video to see if you can get some help in correcting your knees from coming in.
Image Credit: YouTube