If so, how do you fix it? Is this what is causing my knee pain?
To me, from that pic, your femur looks fine. If there is a problem it might be due muscles that are tight in your hips. Im no expert but it looks fine to me.
but the knees do buckle inward, correct?
You need to have the range of motion in your lower extremities measured by a qualified trainer/specialist. There are many instances that can cause knee pain and unfortunately it’s too hard to diagnose from a photo. Could be any number of things…