HL Week 2

Case

A 19-yr-old female athlete comes to the emergency department with her coach after injuring her left knee during sports practice. She says she heard a "pop" when she made a quick turn and then developed a sharp pain on the lateral side of her knee and her leg "collapsed."

Open Ended

What are the differential diagnoses that can account for her condition? Why?

Open Ended

What do you choose to do to confirm your initial diagnosis? Why?

​Case courtesy of Samir Benoudina, Radiopaedia.org, rID: 42948

AP, X-ray: An X-ray picture in which the beams pass from front-to-back (anteroposterior). As opposed to a PA (posteroanterior) film in which the rays pass through the body from back-to-front.

​AP X-Ray of L Knee

​Case courtesy of Samir Benoudina, Radiopaedia.org, rID: 42948

1. Medial femoral condyle.

2. Tibial spine.

3. Femorotibial joint - Medial compartment.

4. Tibia.

5. Fibula.

6. Fibular head.

7. Proximal tibiofibular joint.

8. Femorotibial joint - Lateral compartment.

9. Lateral femoral condyle.

10. Patella.

11. Femur.

12. Fabella.

13. Tibial tuberosity.

14. Femoropatellar joint.

15. Medial patellar joint.

16. Lateral patellar joint.

The half-moon shaped meniscus is cartilage that is found between the femur and tibia. The meniscus absorbs the impact load of the joint and is involved in stability. The meniscus is mostly avascular and is divided into the anterior horn, body, and posterior horn. A medial and lateral meniscus is connected by the transverse ligament.

What is the role of the meniscus?

Ligaments

Connect bone to bone

• LCL = Lateral collateral ligament

  • extends inferiorly from the lateral epicondyle of femur to the lateral surface of the head of the fibula

• MCL = Medial collateral ligament

• ACL = anterior cruciate ligament

• PCL = posterior cruciate ligament

--Complete anatomy, posterior view of knee

https://3d4medic.al/weSLvllp

-- add normal MRI

https://radiopaedia.org/cases/normal-knee-mri?lang=us

-- torn ACL MRI

https://radiopaedia.org/cases/full-thickness-acl-tear?lang=us

--Complete anatomy, posterior view of knee

https://3d4medic.al/weSLvllp

-- add normal MRI

https://radiopaedia.org/cases/normal-knee-mri?lang=us

-- torn ACL MRI

https://radiopaedia.org/cases/full-thickness-acl-tear?lang=us

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