0:01

That's basic anatomy

0:02

and I imagine all of those,

0:04

you listening know it quite well.

0:06

But this part you may not know as well.

0:08

And that is the anatomy of the sub Taylor joints.

0:12

There are two joints, one with a simple name,

0:16

the posterior sub Taylor joint,

0:18

which is shown nicely here in a lateral aspect,

0:21

and you can see it on the medial view as well.

0:25

The second joint is the complicated joint,

0:28

simply sometimes called the anter sub Taylor joint.

0:32

You see what it does, it dives vertically between the talus

0:36

and navicular and then extends horizontally in a posterior

0:41

direction, separating the tus

0:43

and portions of the calcaneus,

0:46

including the sutent ulu taly.

0:49

Now, the reason this is confusing to a lot

0:52

of people is it's two joints, but we have multiple facets.

0:56

We actually have six facets or three pairs of facets.

1:01

I'll explain that in a moment.

1:03

These two joints normally do not communicate.

1:07

So here I'm showing you, as we look at sagittal sections,

1:11

lateral to medial, the two sub Taylor joints here,

1:15

we can see that talo, calcan, navicular joint,

1:19

and the posterior subtalar joint.

1:21

And we can see in this particular region laterally there is

1:25

something separating that and that's the cervical ligament.

1:28

And now we proceed over

1:30

and eventually get to the medial aspect.

1:33

And here is the interosseous talo calcan ligament

1:37

that separates the so-called anterior

1:40

and posterior subtalar joints.

1:43

Now to explain the six facets

1:45

or three pairs of facets,

1:47

here's a picture taken from a web clinic that we did

1:50

for Rat Source by Karen Jang, who will be talking

1:54

to you a little bit later.

1:55

And although there are variations in the pattern,

1:59

here are the anin middle facets of the Alis,

2:02

the anin middle facets.

2:04

You can see here of the calcaneus.

2:06

These articulate in the talo calcan navicular joint.

2:11

With regard to the posterior sub joint,

2:14

it is these two facets that communicate.

2:18

So six facets, three pairs of facets,

2:22

two sub joints that normally do not communicate.