0:01

Let's make some anatomic skeletal correlation with

0:05

MRI.

0:07

We've previously talked about the humerus,

0:11

and we didn't talk much about the upper part of the humerus,

0:15

which has a medial epicondyle and a lateral

0:18

epicondyle, and these form at various stages of life.

0:22

We'll talk about that at another time, but they also fuse at various

0:26

stages in life. And these are important landmarks for the

0:30

origins of the common flexor pronator mass and the common extensor

0:33

tendon. Then we've got our capitellum labeled C,

0:38

and it's convex downward.

0:40

It is covered by cartilage and capsule, which is seen as this white line,

0:44

as is the cartilage of the radius, which is mixed in, in this white

0:48

line. Then the cortex of the radius, and then the radius itself

0:52

has a concavity. It's somewhat disc shaped.

0:56

And an area above here, which we don't see right now, which would be in this

0:58

location, way anterior is known as the radial

1:02

fossa, which is where the radial head slides into when your arm is

1:06

in full flexion and some supination.

1:11

Then we've got a radial ulnar articulation, which allows

1:15

for some rotation, pronation, and

1:19

supination. So that's an articulation all unto itself.

1:23

So we got radiocapitellar. There's our radius.

1:26

Radial ulnar right there.

1:29

And now we have the ulnohumeral articulation.

1:33

This is highlighted by the trochlear groove, which is a groove that

1:37

has two flare-shaped components to it.

1:42

The trochlear groove is occupied proximally

1:46

by the olecranon, which is over here,

1:48

and there's a fossa back here called the olecranon fossa.

1:51

And then more distally, it's occupied by the

1:55

coronoid process. So these two combine to fill

1:59

this potential hole or space.

2:03

Another important and critical landmark that we have

2:07

highlighted before is the sublime tubercle of the ulna, this

2:11

little point right here.

2:13

It is this location where the medial

2:17

collateral ligament anterior bundle, the most important

2:21

critical stabilizer on the medial aspect of the elbow, will

2:24

insert.

2:26

That's a quick review of bony anatomy.

2:29

I might add one more thing, actually.

2:30

This linear structure anteriorly represents the crest of

2:34

supinatoris of the ulna, which is where the

2:38

lateral ulnar collateral ligament

2:41

from the lateral side inserts on a medial bony structure.

2:44

That's kind of counterintuitive.

2:47

That's our bony anatomy.