Knocked knees are a result of the body trying to find joint actions it is naturally missing in order to complete the gait cycle, or allow for full human movement. This comes at a cost of stressing tissues and joints around the pelvis and knee. To fix it, we should start with the root of the problem – the pelvis in Anteiror Tilt.
Pain
If your feet are flat, you are not going to get your arch to “re-rise” without a lot of help, especially from something like an orthodic. Pay attention to your pelvis because it’s a primary factor.
Lateral pelvic tilt is often a result of a compensatory strategy the body has adapted to because of an imbalance of musculature within the pelvis. We want to address that by giving more "pushing" muscles on the higher side and more "weight-bearing" muscles on the lower side.
Breathing involves many joint actions at both the ribcage and pelvis. If you cannot breathe well, your skeleton is likely biased in a state of inhalation or exhalation. Being stuck in a given orientation of joint actions can restrict other ones, resulting in certain tissues and structures repetitively being stressed over time.
High arches prevent the arch from dropping and lowering into the ground in walking/running. This causes a lack of “yielding” into the ground which can result in many compensations. In order to address this, we should re-teach the missing link: Pronation and also likely internal rotation.
Winged scapula are often a result of the shoulder blade not being able to glide freely on the ribcage due to compression within it (poor breathing mechanics). This causes the scapula to deviate outward in an attempt to find more movement.
What it ultimately comes down to is that we favor our right sides and our asymmetrical nature puts us in this position.
This is completely normal and not a problem at all, but what matters is that this asymmetry can be exasperated by poor breathing, postural integrity, and lifestyle habits like sitting too long.