Knee dislocation

Question 1

Who is most likely to suffer a knee dislocation?

Answer 1

Teenagers
Females

Question 2

What at the 6 possible directions of knee dislocation?

Answer 2

• Posterior
• Anterior
• Medial
• Lateral
• Medial rotatory
• Lateral rotatory

Question 3

How may knee dislocation present?

Answer 3

There may be spontaneous relocation, but it is not a diagnosis to be missed, so lateral colateral ligament injury and a peroneal nerve injury should be assumed to be a knee dislocation

Question 4

What are some possible complications of knee dislocation?

Answer 4

There is a risk of damage to the popliteal artery, leading to tearing or thrombosis, common fibular nerve (Peroneal) injury and compartment syndrome

This can also lead to ligamentous laxity and arthrofirbosis and stiffness

Question 5

What investigation is used in suspected vascular injury due to knee dislocation?

Answer 5

Arteriogram and MRI

Question 6

How is ligamentous stability examined in knee dislocation?

Answer 6

Under anaesthetic

Question 7

How are knee dislocations managed?

Answer 7

Urgent management is required with reduction under sedation

Question 8

When is surgical reduction indicated in knee dislocation?

Answer 8

If the condyle has button-holed through the capsule

Question 9

How quickly should surgical repair be performed in vascular an nerve repair in knee dislocation?

Answer 9

Within 6 hours

Question 10

What is definitive surgical treatment of knee dislocation?

Answer 10

Sequential ligamentous repair