According to concave convex rule ,in flexion sliding and rolling of tibia should be in post direction so what's the need to acl activation in flexion ?
Yes what u said is right as per concav convex rule but i dont understnd what u mean by ACL ACTIVATION? Are u refering to any muscle activation like quads or hamstring? Its just the muscles that are activated.
@@TonysTutorial as u explained that in flexion the Antereo medial fiber of acl works in order to prevent ant tibial translalation ..so my question is in flexion as per concave convex rule their should be no ant tibial translation so why acl ant med fibers are getting taut?
Shareena Mehboob thts makes it clear...thnks for that... @shareena the concave convex rule or any rule is applicable to the intact joint. What does the ligaments do? Ligaments dont faciliate or cause motions or transalations they check and restrict it. Thts their main role. We are able to able tne concave convex rule only if the joint is intact. And that intactness is provided by both bundles of ACL at diffrent ranges of ROM. If AMB is not there what hppens theres no stabilization force in that direction! So what hppens we cant apply the rule bcz movement wont hppen in the posterir direction as theres nthing to check tibia move glide anteriorly. Its that intact ligament that maintains knee in its role and enable posterior translation to occur.
Thanku sooo much sir ! The way u explain it feels like how much difficult the topic may be u are going to make it easier to understand ... U are one of my favourite teacher .
Super class sir, great explanation and good lectures 👌👌👌 really like it 🤝 the demonstration is very nice... thanks sir 😊😊thanks for making.... god bless u....... 👍
Hi Tony.. is there any rule or precedence in anatomy as to use inferior to superior direction and medial to lateral direction while naming ligaments or muscles or other structure ? I saw some anatomists video where they use inferior attachment of ACL as origin. They explained ACL and PCL with reference to Tibial attachment. ACL is anteriorly originated from tibia and PCL, posteriorly originate from tibia. Your views please. Thank you
Usually we have a reference system known as anatomical position of body, its with that we describe medial lateral, proximal distal etc. But in this case of ligaments I dont think that stands relevant.I have also noted difference in origin and insertion of ACL and PCL in anatomy texts. But in Biomechanics and from more literatures I found out it as from femur as I described in video. Anatomy texts some of them are dated ones may be thats why the difference exists.
@@TonysTutorial i mean to ask as to origin and insertion naming. What to name origin and what to say as insertion. I observed its inferior and/or medial attachment is considered origin and superior and/or lateral as insertion for ligaments n muscles.
When theres cocontraction of muscles for eg. the quadriceps and hamstring contract at same time, this simultaneous contraction decrease load or strain on ACL( i explined its mechanicsm in video, pls check out), and this seems advantageous. But this is actually disadvantage to the joint as a whole. Thats bcz in the joint thers is pull or stress induced by both the muscles, as in our example anterior force by quads and posteriorly by hamstring. Therefore the total joint compression (due to muscular activity increases). I hope i could clear your doubt...if not pls be free to ask...thnk you
In knee flexio and extension there is possible in anterior translation and prevent by AMB and PLB bundle that you explain sir but come in role with muscle while knee extensors only create load on acl during knee extension it goes for anterior translation and acl get relaxed by flexor muscles but in flexion also there is possible to anterior translation which is prevent by AMB so the hamstring muscles also rise load on AMB bundle it's crt sir??
Sir that hamstring and soleus cause only posterior translation means then how anterior translation is happen at knee flexion??? Because the flexion is done by the action of hamstring only which leads to posterior translation
Sir, Kindly describe in short about Muscle loading and unloading and muscle action and inhibition. (providing an example would help) Sadly, i cant collage this part.
Sir, muscular co contraction will cause an increase in the joint compressive forces but is that harmful for a healthy joint? I'm a little confused 😅 in which situations will it be harmful?
Yes co contraction may help reliving the strain on ACL or PCL...but it effects joint adversly...thts think of a sitation in which theres activation of quads and hamstring at same time...for eg half squated position knee in flexion ...flexion maintained by hanstring but at same time buckling prevented by quads...both has to wrk to maintain that postion, so if two muscles wrks at same time the compression at joint increases along wth it...bcz joint compression is a sum of body weight comprssion plus muscular comprssion( hip unilateral and bilateral calculations).So here joint comprssion increses due to simultaneous wrking of both muscles. So in scenarios like this its detrimental to the joint health.
Infact this co contraction is so cool to try ...i made my students sit in that postion while dealing wth anthor example...and it was so toigh to maintain that postion for even a shorttime( when both muscles wrk) just try it out and explore Good luck
@@TonysTutorial yesss thankyouuu, experiencing it is the best way to learn😄😄😄 and also I'm soo grateful for all the videos you've made and put up, its helping me tremendously
Hello sir 🙏 By mistake i asked this question from my another account ...and i deleted that. My question was that I have read that intercondylar notch have a disadvantage in some people that due to narrow intercondylar notch risk of acl injury is very high.. So , could you please make me understand this in a easy way and in a more elaborated way...
Rana u r again with a strong question,i have only read in literature about the same. And after seeing ur question i hv been thinking on it. But theres no concise evidence or theories that supprt or state the reason for this
Wait man, but still the corelation between ACL injury and intercondylar notch is widely accepted and suppprted. People with low intercondlyar notch have shown greater risk of sustaning the ACL injury
They state the reason for it with measuring the Alpha angle and intercondylar width which predisposes to the condition, but thts something u might not get at this point ...about aplha angle and other measures
According to concave convex rule ,in flexion sliding and rolling of tibia should be in post direction so what's the need to acl activation in flexion ?
Yes what u said is right as per concav convex rule but i dont understnd what u mean by ACL ACTIVATION? Are u refering to any muscle activation like quads or hamstring? Its just the muscles that are activated.
@@TonysTutorial as u explained that in flexion the Antereo medial fiber of acl works in order to prevent ant tibial translalation ..so my question is in flexion as per concave convex rule their should be no ant tibial translation so why acl ant med fibers are getting taut?
Shareena Mehboob thts makes it clear...thnks for that... @shareena the concave convex rule or any rule is applicable to the intact joint. What does the ligaments do? Ligaments dont faciliate or cause motions or transalations they check and restrict it. Thts their main role. We are able to able tne concave convex rule only if the joint is intact. And that intactness is provided by both bundles of ACL at diffrent ranges of ROM. If AMB is not there what hppens theres no stabilization force in that direction! So what hppens we cant apply the rule bcz movement wont hppen in the posterir direction as theres nthing to check tibia move glide anteriorly. Its that intact ligament that maintains knee in its role and enable posterior translation to occur.
Shareena Mehboob so dont confused wth role of ligament and muscle if it was a muscle instead of AMB the things would hv been as u imagined
Shareena Mehboob i sincerly appreciate ur thoughts and doubts...its so great u think this way...good luck
I am from egypt and i appreciate that video so much
Thank you sir
Sir.... By these vidios in your channel.... We can study these portions of our chapters even in lockdown periods ✔️✔️✔️
🥰🥰thats so nice to hear🤝
ACL is somthing that we come across at a daily basis;thank you for this class👍good class
🤝🤝🤝
Thanku sooo much sir ! The way u explain it feels like how much difficult the topic may be u are going to make it easier to understand ... U are one of my favourite teacher .
Very simplified explanation
Thank u sir
Thnk u
Very much relevant for sports physios
Thank you
Amazingly explained thank you sir
Thank you sir for Nice explanation ❤️
Always welcome
nyc explanation sir ☺️ur explanation makes us easy to learn biomechanics thanku sir
thnk u so much.....Most welcome 😊
Thank you so much sir,it is very useful for me ,
So glad to hear...good luck to u
Excellent explanation sir
Wonderful Explanation 🤝🤝🤝
I'm very satisfied by ur simple discussion 😊
Thank u sir....God bless🙌🙌
Thank you, hppy to hear from you
It's really effective and helpful class👌👌👌Thank u sir...
Tbank you
thankyou sir! I found your videos so helpful and you taught every subheading of topic so properly..🙂
Glad to hear that...thnk u
Awesome video sir thank you sir
Good explanation👌👌.....it is really easy to catch... thank u soo much sir...🤗🤗😊
Hppy to hear
Superb Explanation Sir 💯✌️
Thnk u
superbbb...very useful
Thnk u
Super class sir, great explanation and good lectures 👌👌👌 really like it 🤝 the demonstration is very nice... thanks sir 😊😊thanks for making.... god bless u....... 👍
Thnk u 🤝🤝🤝🤝
👍👍
Helpful video, Thankyou sir.
Thank you
Very well explained.... Tnk you sir
So nice of you
Nice video sir, good explanation 🤝🤝, thank u so much sir
Aiswarya Pp thnk u
Great class sir. 👍👍👍
Thnk u
Its nice to understand sir..... 👌👌👌
thank you
Great class sir!!
Thank you
Thank you so much sir ✨🙏
Very well explained cls🙌
Thnk u
It's really good n understable🤝keep going....👍
n thanku sir for this class😀
🤝🤝hppy to hear
Plzz explain arcuate popliteal ligament, oblique popliteal ligament, posterior oblique ligament
TIME CODES:
ACL FUNCTION: 8:22
AMB & PLB: 6:25
Role and Interplay of muscles: 19:58
nice video sir .. 👌👌👍
Thanks and welcome
very useful video
Thnk u
Amazing video. The Only mistake is that u said acl extends inferiorly, medially n anteriorly but the actual thing is vice versa.
Nice video👏👏👏
🤝
Nice video sir👍
Thnk u
Ostechodral difect after problems?
Nice video👍👍
🤝🤝
Sir, I m confuse between AMB & PL B function, which one work on flexion or which one on extension.pls sir guide me
Hi Tony.. is there any rule or precedence in anatomy as to use inferior to superior direction and medial to lateral direction while naming ligaments or muscles or other structure ? I saw some anatomists video where they use inferior attachment of ACL as origin. They explained ACL and PCL with reference to Tibial attachment. ACL is anteriorly originated from tibia and PCL, posteriorly originate from tibia. Your views please. Thank you
Usually we have a reference system known as anatomical position of body, its with that we describe medial lateral, proximal distal etc. But in this case of ligaments I dont think that stands relevant.I have also noted difference in origin and insertion of ACL and PCL in anatomy texts. But in Biomechanics and from more literatures I found out it as from femur as I described in video. Anatomy texts some of them are dated ones may be thats why the difference exists.
@@TonysTutorial i mean to ask as to origin and insertion naming. What to name origin and what to say as insertion. I observed its inferior and/or medial attachment is considered origin and superior and/or lateral as insertion for ligaments n muscles.
Sir I don't understand how ACL provides rotational stability??
Sir, one question
How co-contraction increases joint compressive loads?
When theres cocontraction of muscles for eg. the quadriceps and hamstring contract at same time, this simultaneous contraction decrease load or strain on ACL( i explined its mechanicsm in video, pls check out), and this seems advantageous. But this is actually disadvantage to the joint as a whole. Thats bcz in the joint thers is pull or stress induced by both the muscles, as in our example anterior force by quads and posteriorly by hamstring. Therefore the total joint compression (due to muscular activity increases). I hope i could clear your doubt...if not pls be free to ask...thnk you
Sir please teach wrist complex also
Sure...do share about chanel with ur frnds too thank u
In knee flexio and extension there is possible in anterior translation and prevent by AMB and PLB bundle that you explain sir but come in role with muscle while knee extensors only create load on acl during knee extension it goes for anterior translation and acl get relaxed by flexor muscles but in flexion also there is possible to anterior translation which is prevent by AMB so the hamstring muscles also rise load on AMB bundle it's crt sir??
Sir that hamstring and soleus cause only posterior translation means then how anterior translation is happen at knee flexion??? Because the flexion is done by the action of hamstring only which leads to posterior translation
Pls clear my doubt sir.....
Greatsir
Super👌
Thnk u
Sir, Kindly describe in short about Muscle loading and unloading and muscle action and inhibition. (providing an example would help)
Sadly, i cant collage this part.
Thanks bro
🤝🤝
Sir, muscular co contraction will cause an increase in the joint compressive forces but is that harmful for a healthy joint? I'm a little confused 😅 in which situations will it be harmful?
Yes co contraction may help reliving the strain on ACL or PCL...but it effects joint adversly...thts think of a sitation in which theres activation of quads and hamstring at same time...for eg half squated position knee in flexion ...flexion maintained by hanstring but at same time buckling prevented by quads...both has to wrk to maintain that postion, so if two muscles wrks at same time the compression at joint increases along wth it...bcz joint compression is a sum of body weight comprssion plus muscular comprssion( hip unilateral and bilateral calculations).So here joint comprssion increses due to simultaneous wrking of both muscles. So in scenarios like this its detrimental to the joint health.
Infact this co contraction is so cool to try ...i made my students sit in that postion while dealing wth anthor example...and it was so toigh to maintain that postion for even a shorttime( when both muscles wrk) just try it out and explore
Good luck
@@TonysTutorial yesss thankyouuu, experiencing it is the best way to learn😄😄😄 and also I'm soo grateful for all the videos you've made and put up, its helping me tremendously
Yes true...good luck to u
Thank u
Thank u sir
Thank you
nicely explained.. could have been more aware and vigilant when pronouncing PLB and AMB
yes, that was true
Hello sir 🙏
By mistake i asked this question from my another account ...and i deleted that.
My question was that
I have read that intercondylar notch have a disadvantage in some people that due to narrow intercondylar notch risk of acl injury is very high..
So , could you please make me understand this in a easy way and in a more elaborated way...
Sir🥺🥺🥺
Rana u r again with a strong question,i have only read in literature about the same. And after seeing ur question i hv been thinking on it. But theres no concise evidence or theories that supprt or state the reason for this
Wait man, but still the corelation between ACL injury and intercondylar notch is widely accepted and suppprted. People with low intercondlyar notch have shown greater risk of sustaning the ACL injury
They state the reason for it with measuring the Alpha angle and intercondylar width which predisposes to the condition, but thts something u might not get at this point ...about aplha angle and other measures
Ok sir thank you❣️
Sir , are there any other disadvantages related to intercondylar notch with respect to other ligaments or anything else???
My acl surgery fail rivision surgery successful %🤔
Wow
👍👍👍
Thnk u
👍
🤝
Great class sir!!
Haseeb Chathoth glad to hear....thnk u
Nice video sir👏💯
Thnk u
👍👍👍
🤝🤝🤝
❤