0:01

Now we come to the popular word delamination.

0:05

If you go to an English dictionary

0:07

and look up the word delamination, it's a mode

0:10

of failure in which a material fractures or separates.

0:15

In layers, we see delamination, a lot of structures.

0:19

We see it in cement, in ceramic,

0:22

we certainly can see it in wood, we see it in timber.

0:26

This is structural delamination.

0:29

Now, when we talk about delamination involving a tendon

0:34

or a ligament, as I spoke about earlier in this course,

0:37

I indicated to you that was a pattern of failure in a tendon

0:42

or ligament that is parallel to and between

0:46

or among the collagen bundles.

0:50

So classic delamination of a tendon

0:53

or ligament is a collagen sparing pattern of failure.

0:58

Now, it can be obliquely oriented,

1:01

and if so, you will involve certain bundles.

1:03

But this is the classic picture of

1:06

what delamination looks like in a tendon or ligament.

1:10

So now you see the problem that we have when we deal

1:13

with articular cartilage.

1:16

You see at the top we have layers of collagen,

1:19

the laminate splendas below that, the arcades

1:22

that extend down into the deeper area.

1:25

So a lot of horizontal and vertical collagen bundles.

1:30

And then we have the cellular rows

1:33

representing mainly in a horizontal fashion.

1:36

So delamination, as it has been applied

1:39

to cartilage in the literature,

1:41

depends upon whether you're using collagen as your point

1:45

of reference, or are you using cellular rose.

1:49

And therefore, if you read the articles,

1:51

you're gonna see various types of

1:54

failure called cartilage delamination,

1:58

and I'm illustrating those on the picture on your right.

2:02

So let's look at that. Number one would be a pattern

2:06

of delamination if you use cellular rows

2:10

as your point of reference.

2:12

Pattern two A would be delamination

2:16

of the surface horizontally oriented collagen.

2:20

Pattern two B would be separation of at the region

2:26

of the tide mark.

2:27

Okay? Which is often seen between the calcified

2:32

and noncalcified layers of cartilage.

2:35

And pattern two C would be

2:38

that vertical delamination using collagen

2:41

as our reference along the course

2:44

of those arcades of Benning hook.

2:47

So these are various patterns of cartilage delamination

2:52

described in the literature.