because the hip is the boss of the knee, and the knee is the boss of the foot, so we do not force the knee and hip to move in straight line by using its subordinate, instead we help the knee and hip by placing the foot to where they want it to be.
Great discussion! Try to flex your hip to bring your knee to chest like this (ernestchaophysio.files.wordpress.com/2021/04/untitled.png?w=636&h=&zoom=2). Now try to same motion but bring your leg lateral like this (ernestchaophysio.files.wordpress.com/2021/04/untitled1.png?w=636&h=&zoom=2) You'll notice there is more range when you bring your hip into flexion with pulling it slightly lateral. Now if we translate this to the bike, when the hip runs out of flexion it will deviate lateral and pull the knee along with it. By increasing the stance width at the feet we help utilize more range from the hip. This is great for those with arthritic hips. Another option would be running shorter crank arms, which in my opinion is a very good solution but also a lot more expensive.
It's possible that excess Q-factor/stance width would place extra pressure on the lateral knee if it causes it to track in an abnormal pattern. We have to look at adjusting stance width with the width of the hips and available range of the hips so the knee is tracking relatively "normal".
Great video. Why do you increase his qfactor when the knee track lateral?
because the hip is the boss of the knee, and the knee is the boss of the foot,
so we do not force the knee and hip to move in straight line by using its subordinate, instead we help the knee and hip by placing the foot to where they want it to be.
Great discussion! Try to flex your hip to bring your knee to chest like this (ernestchaophysio.files.wordpress.com/2021/04/untitled.png?w=636&h=&zoom=2). Now try to same motion but bring your leg lateral like this (ernestchaophysio.files.wordpress.com/2021/04/untitled1.png?w=636&h=&zoom=2) You'll notice there is more range when you bring your hip into flexion with pulling it slightly lateral. Now if we translate this to the bike, when the hip runs out of flexion it will deviate lateral and pull the knee along with it. By increasing the stance width at the feet we help utilize more range from the hip. This is great for those with arthritic hips.
Another option would be running shorter crank arms, which in my opinion is a very good solution but also a lot more expensive.
But increasing q factor will also put more pressure on the knee in a lateral perspective?
It's possible that excess Q-factor/stance width would place extra pressure on the lateral knee if it causes it to track in an abnormal pattern. We have to look at adjusting stance width with the width of the hips and available range of the hips so the knee is tracking relatively "normal".