PATELLOFEMORAL JOINT STRESS & STABILITY # KNEE BIOMECHANICS
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- Опубліковано 15 чер 2024
- Detailed lecture on patellofemoral joint biomechanics,this session discuss the patellofemoral joint stress and stability. The joint stress is force per unit area, and being an in congruent joint as well as due to speciality of patellofemoral joint,the joint is highly susceptible to the joint stress.The reasons for this high stress is mainly due to the pull of quadriceps and the patellar tendon. There is a difference between line of quadriceps pull and patellar tendon this puts into a high joint stress which is compressive in nature.
The patellofemoral joint stress is high at flexion range and minimum at extension, and as flexion progress it increase further and reaches maximum at deep flexion range.
Further discussion focuses on the frontal plane stabil of patellofemoral joint,contrary to the maximum compression at flexion,stability is maximum at flexion and minimal at extension.
Time codes:
1.Patellofemoral joint stress: 1:40
2.Factors regulating stress: 2:21
3.Joint stress in extension: 7:20
4.Joint stress in flexion: 10:03
5.Compensatory strategy : 12:40
6.Patellofemoral joint stabiliy: 22:30
7.Compensatory strategy to increase stablity: 26:40
WATCH VIDEO FOR MORE DETAILS...
For more doubts and notes.............
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TONY JOSEPH
ASSISTANT PROFESSOR
KANNUR MEDICAL COLLEGE
To summarize
Joint forces and stability has inverse relationship in pf joint.forces are higher in extension,stability is less and compression is high although many factors are working altogether to reduce some stress and chances of patellar displacement due to difference in line of pull between quad and patella tendon .contact area is higher in flexion less are the joint forces and greater is the stability.anteriorly the patella is stabilized by longitudinal and transverse stabilizers..
Thanks for providing readymade material to working people like ours who have time restrictions to revise and go through
Thats great job...may i add some more clarity....joint forces or joint stress ( Stress=F/A) is showing inverse relation at Patellofemoral joint. That's is at KNEE EXTENSION is having least compression or joint stress in this joint and that is goof for the joint as less stress lesser is the likelihood of joint degenerative changes or excessive demand on the joint.
At same time FLEXION has very high stress and compression and it increases as flexion increases. But in terms of stability the KNEE FLEXION is more stabilized than EXTENSION and thus there is increased chances of subluxation or lateral displacement at extension.
So in nutshell in a rehab setup its better not to go to extremes of flexion such as deep squat etc if there's degenerative changes.This are reasons why SLR and exercises with knee extension( but not to go with terminal extension in non-weight bearing, weight-bearing its perfect) are advised in DEGENERATIVE CONDITIONS.
But if our patient is there with issue of loss is stability at the joint its better to make him exercise in flexion range than in extension( in particular avoid knee terminal extension in non weight bearing)
More clarity u will get by tomorrows video on Q ANGLE
It gives me immense happiness that its helping you.....thats what i aim by this ...to let biomechanics have a great role in our treatments rather than just traditional ways....all the best mam....your message made my day..
And madam, we see our patients with OA and other degenerative changes adopting a knee flexed position than knee extension espically old age...this may ne one reason why the degenerative changes increases many folds when knee flexion is maintained for long time as always the stress and compression on their joints are maximum...which wont be good in long run...
Thank you
@@TonysTutorial the contact area between patella and femoral trochlea increases from 0 to 90 degrees and hence open chain excersices from 90 to 30 degrees are adviced as they reduces the stress on painful joint
Each topic of knee bio mech is Brilliantly explained. Thank you sir
Time codes:
1.Patellofemoral joint stress: 1:40
2.Factors regulating stress: 2:21
3.Joint stress in extension: 7:20
4.Joint stress in flexion: 10:03
5.Compensatory strategy : 12:40
6.Patellofemoral joint stabiliy: 22:30
7.Compensatory strategy to increase stablity: 26:40
Spr energetic & grace full class 👌👌👌very well explained sir 👍👍Thank u very much for a wonderful class...
Thnks a lot🤝🤝🤝
Camera adjustment is good more closer look and the class is amazing . And u look awesome as well,,🤟👌❤️
Thnk u🤝🤝🤝
Good class sir.......
Thank you...
Nice class sir👌👏👏👏.... it is really a nice one... i could catch this portion easly... thank u sooooo much for made it simple....expect this type of nice classes ... keep going well🤗🤗
Thank you so much...vry glad to hear
Excellent class sir 👌👌👌, good explanation 🤝
Thnk u
Thank u so much sir! For the great lecture
Adhila Adhi glad to hear
Crystal clear sir..
wow this great
Sir i have a doubt 16:11 earlier in the video you said in flexion stress is maximum
Bt later in strategies to decrease the stress it was mentioned that contact area inc. in flexion so jt stress decrease??
Nice video👍
Thnk u
Great explanation 👍👍👍
Sir your videos are more understandable than lectures in class thank you so much for that ....sir please make videos on shoulder joint and wrist joint please sir your videos are really needed for this joints
Your comments makes me delighted ...hppy to hear...defintly we will have upperlimb videos shortly...thnk u
Shoulder videos are uploaded ...do check out
Thank you so much sir 🙏
Great
Good lecture sir 👍easy to understand
Thnk u
👍👍👍👌👌👌👌
Pradeep Kumar 🤝
Great lecture. Liked it.
Thnk u
Nice class sir🤙
Thnk u
Good evening sir, so will the medial and lateral patello meniscal ligaments help with the transerve stability too??
thnk u
Well explained sir👍
Great 👍
Great explanation sir 👏👏
Thnk u
Great work sir👍👍💯
FARHAN RAFI thank you
Well explained 👍nice class sir
Thnk u
Hello sir..
Sir which book should i prefer for biomechanics...
I have pamela & cynthia
And newmann
Are these two books enough?
Would you like to add any more to it?
Hai ...good to hear from you agin ...if you are a UG student cynthia c norkin is prefect choice ...you just need it thats all...but that text is not designed for UG students so theres lot stuffs on researches, studies done by many individulas etc...you dont need that for UG STDIES...so go for slective studies focusing whats needed.But if u wish to go beyond text and learn then thats something great ...use books like NEWMAN, CAROL O OTIS etc if so...best wishes
@@TonysTutorial thank you sir 🙏
Hello sir, I need more clarification on why the joint stress is maximum at medial facet. Thank you!
Very well explained 🤗🤗
Thnk u
Well explained sir 💯
Thnk u
Sir next plzz make a vedio on ankle joint as I’m having internal nxt week it seems to be helpful...humble request
Oh yes...will do my best...planing to start on coming monday...
Thank you sir 🥰
My pleasure
Super class sir, 👌👌👌 the explanation, style of teaching is very nice 🤝 also great lectures, thanks sir thanks for your great hardworking 😊😊😊🤗🤗
Glad to hear...thnk u
Well explained sir
Thnk u
Good understand sir✔️✔️✔️
Thnk u
Excellent class sir👍👍
Thnk u
Helpful video
Thnk u
what changes will the condition genu recuvatum produce at patellofemoral joint??
Lets look into what is genu recurvatum , its is hyper extension at knee joint, since its a patholigical sitation than anatomical it will lead on to variuous changes in the knee joint.Here there will be increased tensile stress on posterior knee joint capsule and ligamentous structre as in this postion posterior structres are streched out.Further theres is some instability with the knee joint yhat can lead to increase ACL injuries.
And i believe that it can also lead to increased compression forces in the anterior joint compartment and posterior there is increased
okay, sir thankyou so much for your time and answers. 👏🏻👏🏻
I got it sir
Welll explained🤗
Thnk u
Hi. Can you give privet class on this subject via zoom?
Drop a message on 9544421896 whatsapp or in instagram please
Gud class sir🙌
Thnk u
sometimes when you speak fast then you speak wrong ...so keep patience and correct the faults