Over Pronation & Supination Motion Biomechanics of the Subtalar Joint Explained
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- เผยแพร่เมื่อ 12 มิ.ย. 2012
- Valmassey's Textbook Clinical Biomechanics of the Lower Extremities is a great reference. I suggest it amzn.to/LuvjO2
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This illustration focuses on the Subtalar Joint of the foot. The narration is as follows:
In human anatomy, the subtalar joint is also known as the Talocalcaneal joint, in the foot. This articulation is between the talus and the calcaneus at the posterior, middle, and anterior facets and is capable of both pronation and supination, about a single axis model. This motion exists primarily as transverse and frontal plane motions, depicted in the series shown.
In the medial and lateral viewpoints, this motion of pronation and supination will lower and raise the arch height of the foot, respectively. This will be accompanied by change in the talocalcaneal angle which increases and decreases, as well. As the medial column flattens, the talonavicular articulation will fault, with the talar head declining plantarly, splaying of the foot will also result in changes in overall length.
Anterior and Posterior views will demonstrate an internal and external rotation of the leg, which translates in frontal plane inversion and eversion of the heel respectively. This subtalar pronation, unlocks the midtarsal joint and in return, creates a mobile and adaptable posture to the foot architecture.
There will also be a notable widening and narrowing of the foot shape, visible in the dorsal and plantar viewpoints of this simulation. Here, the Talocalcaneal angle will also demonstrate widening in pronation, while the talar head escapes its articulation with the navicular.
The subtalar joint is the primary interface of pronatory and supinatory motions of the foot and leg. The human foot is a remarkable instrument of human locomotion, and is an intriguing accomplishment of engineering.
© 2012 DrGlass.org
Narrator: Caroline Murphy
Illustrations: Nicholas Giovinco & Kevin Kirby
Producer: Nicholas Giovinco
![The Subtalar Joint [Part 2] | Pronation vs Supination EXPLAINED](http://i.ytimg.com/vi/UKNqYVWzGSI/mqdefault.jpg)
The explanation of the foot mechanics in this video is fabulous. Having the foot animated to visualize the movement of the bones is wonderful. When you are curious about the inner workings of the foot someone trying to show you with their foot doesn't compare to an animation that is narrated. Well Done
Better than a book with a 3 or 4 long pages explaning about the inter-relationship between subtalor and transverse joints during pro- and supination movements 👍👍👍
I thoroughly enjoyed watching this. I've always struggled to visualise the way the articulations happen internally and through the different planes. Something I will be watching over again frequently. Absolutely brilliant.
Clay, thanks for the remarks. Will do!
This youtube speaks of the hindfoot component of pronation and supination as the primary driver. In some situations, the midfoot movements, particularly at the Chopart line play the larger roll in pronation and supination. For example, this can happen when the joint capsules of the subtalar joint complex are fibrosed so there is little or no movement in the talocalcaneal joint complex.
Consultingfootpain is using these excellent 3D illustrations. Beautifully delivered and good length to help patients and students. Many thanks
Yes! That would be perfectly fine. I wish you good luck in your studies!
Actualy, I don't mind music, I think it's so (if I may say) cute :3
Thank you DrGlass so much for all videos, I feel so lucky to find them!~
Very informative video. Wonderful job. Please do continue with other topics.
The thing is that the motion of the foot is related to the gait. Thus,, when there is a pronation of the rear foot, all the toes do not touch the ground. That rear foot pronation induces a front foot supination (due to the form of the talus). And supination induces a rise of the heel. Hence, it s not real to show the shock absorber role of the foot on a plan like that
Hello to you too, Watkins. Nice to meet you, (vertically speaking). Calcaneus fractures are a devastating injury. There is a thankless recovery and most of the time it is never "well". I'm sorry you've lived with this as long, but regular use of pain mess is not a good way to live day to day either. Have you visited a foot and ankle specialist in recent years? It may be time to discuss surgery if nothing else has worked so far, unfortunately.
Great 3D animation, thank you
this my favorite foot mechanics animation in You Tube, thank you
@Skylar Davis thank you for your reply, I have been waiting patiently inside a cave. I grew a beard and my clothes are torn. Now, I can come out.
@Karter Gianni I was kidding. My comment was from 4 years ago :D but thank you for the fixzone recommendation. I will check it out.
Thank you!
👌Thanks ! Very Informative !
🌹0:34-0:45 右足的內側觀
🌹0:52-1:00 右足後面觀
🌹1:10 右足自頂向下觀
Hello Dr Glass, What software are you using to provide the animation of the foot?
@DrGlassDPM may i have your permission to take images from your video and print them in my dissertation? I'm a mechanical engineering design masters student focusing on designing a prosthetic ankle, it would be very helpfull?
Why I don't understand,
I thought that pronation suppose to be inward and supination outward. But on subtalar joints its just the opposite.
0:51 Leg internal rotation translates to calcaneal eversion and leg external rotation translates to calcaneal inversion, correct?
Can I ask which app did you use for this video, I am an orthotics student and I need it to creat a project
I am Krushna my foot is totally overpronat please suggest me right way or any surgery.
Please reply. I am wating
I have abnormal supination thereof.
about 230 degrees total rotation. It makes me a fantastical figure skater.
32 years old no treatment or correction, no complications. never had a sprain or otherwise injury of the ankle.
I'd love to illustrate something like that. Do you have any reference material or publications to share, regarding this? Otherwise I would merely be speculating, which I don't want to do.
Cynthia norkins from jp publishers
Does it can be fix by surgery ?
I'm sorry it was distracting to you. When I was producing this video, it felt very bland and sterile, but with a gentle scoring, it seemed to be more "colorful" per se.
I tried to lower the volume so that it wouldn't distract, but perhaps I should have made it lower down or a more even-flowing melody.
But is the surgery effictive ???
The video is excellent. But why is it called Over pronation and Supination. There is a lot of misunderstanding and misinformation on pronation to the point where some are positing that pronation is a pathology that should be constrained. Pronation became a talking point as a result of sports shoes with elevated (drop) and wide heels that greatly increased the length of moment arms acting through the STJ while altering joint accelerations associated with foot strike.
Agreed. I love the animation, as I am studying biomechanics of the foot for my kinesiology class, but the title of this video gives the distinct impression that pronation and supination are pathokinesiology, rather than a normal component of ambulation.
can anyone please tell me if there is a surgery to correct this??
It's normal motion, part of healthy gait. It does not need correction.
Decent explanation. Not great, but still good just to see the model moving.
The music is very distracting.