Wide vs narrow stance

[exter]

Hi rip,
Was having some knee issues doing very wide stance squats. Always thought that the wider you go, the less stress on the knees and the more on the hips.
Today I tried to squat with a shoulder width stance, or slightly wider, I had to use far less weight than usual (only got about 390#) but my knees didn't hurt at all.
Does that make any sense to you ? How does stance width impact the knee moment ?

[Mark Rippetoe]

Starting Strength: Basic Barbell Training | The Aasgaard Company