0:00

The other mechanism that is well known to cause problems

0:04

of the medial supporting structure

0:06

is something I mentioned earlier

0:08

and Eric also talked about it,

0:11

is Amri antral medial rotary instability.

0:14

Beautiful pictures from Mike Stadnik, uh,

0:17

Stadnik at Rad Source from a clinic

0:19

that we did quite a while ago,

0:22

and you can see what happens with this particular

0:25

type of injury.

0:28

One has flexion, one has valgus,

0:30

and one has external rotation of the tibia,

0:33

and it's this particular pattern of rotational injury

0:37

that can lead to ye's triad to the Tetra

0:41

or even the Penta

0:43

that we talked about earlier in this course.

0:46

This is the pattern of rotation shown here,

0:50

exactly identical to this particular position of the knee.

0:55

I showed you this case before, but I'll emphasize it again.

0:59

This is Amri with antral medial rotational instability,

1:03

a picture from the internet.

1:05

Here's the patient. This was a patient

1:08

who was playing badminton,

1:10

and indeed he twisted his knee awkwardly as he was reaching

1:13

for a return, much like

1:16

what we see in the picture from the internet.

1:19

And you can appreciate here the findings associated

1:22

with anterial medial rotary instability, damage

1:26

to the medial supporting structures, again,

1:29

to the tibial collateral ligament,

1:31

and to the deep medial capsule ligament, as well as

1:34

to the anterior cruciate ligament.

Patterns of Injury: Rotational Motion

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0:00

The other mechanism that is well known to cause problems

0:04

of the medial supporting structure

0:06

is something I mentioned earlier

0:08

and Eric also talked about it,

0:11

is Amri antral medial rotary instability.

0:14

Beautiful pictures from Mike Stadnik, uh,

0:17

Stadnik at Rad Source from a clinic

0:19

that we did quite a while ago,

0:22

and you can see what happens with this particular

0:25

type of injury.

0:28

One has flexion, one has valgus,

0:30

and one has external rotation of the tibia,

0:33

and it's this particular pattern of rotational injury

0:37

that can lead to ye's triad to the Tetra

0:41

or even the Penta

0:43

that we talked about earlier in this course.

0:46

This is the pattern of rotation shown here,

0:50

exactly identical to this particular position of the knee.

0:55

I showed you this case before, but I'll emphasize it again.

0:59

This is Amri with antral medial rotational instability,

1:03

a picture from the internet.

1:05

Here's the patient. This was a patient

1:08

who was playing badminton,

1:10

and indeed he twisted his knee awkwardly as he was reaching

1:13

for a return, much like

1:16

what we see in the picture from the internet.

1:19

And you can appreciate here the findings associated

1:22

with anterial medial rotary instability, damage

1:26

to the medial supporting structures, again,

1:29

to the tibial collateral ligament,

1:31

and to the deep medial capsule ligament, as well as

1:34

to the anterior cruciate ligament.

Report

Faculty

Donald Resnick, MD

Professor Emeritus, Department of Radiology

University of California, San Diego

Mini N. Pathria, MD, FRCP(C)

Division Chief, Musculoskeletal Imaging

University of California San Diego

Eric Y. Chang, MD

Adjunct Professor, Radiology

University of California, San Diego

Brady K. Huang, MD

Clinical Professor of Radiology

UC San Diego Medical Center

Lesson

Meniscus (preoperative and postoperative)

Lesson

Meniscus Case Review

Lesson

Footprints and mechanisms of knee injury

Lesson

Cruciate Ligaments

Lesson

Knee Injury & Cruciate Ligament Case Review

Lesson

Medial Ligaments

Lesson

Lateral Ligaments

Lesson

Medial and Lateral Ligament Case Review

Lesson

Postoperative Ligaments

Lesson

Extensor Mechanism

Lesson

Popliteal Fossa

Lesson

Postoperative Ligaments, Extensor Mechanism & Popliteal Fossa Case Review

Patterns of Injury: Rotational Motion