I just wanted to make it clear that the PRIMARY ACTION of the biceps femoris muscle is knee flexion. Also, when it assists in lateral rotation of the tibia, this is when the knee is slightly bent. As for lateral rotation of the femur, it assists in this when the hip is extended. Thanks for watching!
Your videos are such a great help! I hope you would keep going, your channel may not be recognized now in the way it deserves, but sure enough sooner or later it would get there.
I'm confused: What I'm hearing @2:32 is when the leg is internally rotated, the Biceps Femoris is contracted @2:37 and that rotates the leg externally @2:40.
Can you go into detail how medial rotation of the Tibia via the semimembranosus/tendinosis in knee flexion works together with lateral rotation of the fibia via the biceps femoris again when the knee is in flexion and why? this action of the knee flexion and having both the tibia and fibia rotate in opposite directions has always been interesting to me.....
The purpose of the tibia rotation is primarily to facilitate stability, control, and coordination at the knee joint and to a lesser extent at the ankle joint too. The reason why the rotation occurs more strongly when the knee is bent is because it puts the hamstrings in a more advantageous position to rotate. When the leg is straight they are in a more advantageous position for knee flexion. Also, rotation of the tibia is generally needed more with a bent knee. Think of a movement like a deep barbell squat where you externally rotate your hips to avoid knee valgus. A degree if tibial rotation is needed in that moment for correct joint alignment. Hope that helps.
I just wanted to make it clear that the PRIMARY ACTION of the biceps femoris muscle is knee flexion. Also, when it assists in lateral rotation of the tibia, this is when the knee is slightly bent. As for lateral rotation of the femur, it assists in this when the hip is extended. Thanks for watching!
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The most concise and not dry explanation I found. Thank you for your videos!!!
Appreciate it! Thanks for watching
Your videos are such a great help!
I hope you would keep going, your channel may not be recognized now in the way it deserves, but sure enough sooner or later it would get there.
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I'm confused: What I'm hearing @2:32 is when the leg is internally rotated, the Biceps Femoris is contracted @2:37 and that rotates the leg externally @2:40.
Can you go into detail how medial rotation of the Tibia via the semimembranosus/tendinosis in knee flexion works together with lateral rotation of the fibia via the biceps femoris again when the knee is in flexion and why? this action of the knee flexion and having both the tibia and fibia rotate in opposite directions has always been interesting to me.....
The purpose of the tibia rotation is primarily to facilitate stability, control, and coordination at the knee joint and to a lesser extent at the ankle joint too. The reason why the rotation occurs more strongly when the knee is bent is because it puts the hamstrings in a more advantageous position to rotate. When the leg is straight they are in a more advantageous position for knee flexion. Also, rotation of the tibia is generally needed more with a bent knee. Think of a movement like a deep barbell squat where you externally rotate your hips to avoid knee valgus. A degree if tibial rotation is needed in that moment for correct joint alignment. Hope that helps.
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