The Ankle

Question 1

What is the MOI for an inversion ankle sprain?

Answer 1

Single most common injury to the active population.

Lateral ligaments are stressed with sudden inversion, plantarflexion, and internal rotation.

Question 2

Why are Eversion ankle sprains far less common (5-10% of all sprains) than Inversion sprains?

Answer 2

Bony protection (location of lateral malleolus) and ligament strength decreases likelihood of injury.

Question 3

What factors may cause someone to be predisposed to an Eversion ankle sprain?

Answer 3

Excessive pronation, hypermobility, or a depressed medial longitudinal arch.

Question 4

What are the Ottowa Ankle Rules?

Answer 4

1. Pain/tenderness along distal 6cm of tip of lateral malleolus
2. Pain/tenderness along distal 6cm of tip of medial malleolus
3. Pain/tenderness @ base of 5th metatarsal
4. Pain/tenderness @ Navicular
5. Inability to weight bear immediately after injury and for 4 steps during initial assessment

Question 5

What is a Syndesmotic Sprain and the MOI’s associated with it?

Answer 5

Injury to the distal Tibiofibular joint via excessive dorsiflexion and/or eversion/external rotation

Question 6

What is OCD?

Not the mental disorder

Answer 6

Osteochondritis Dissecans. One or several fragments of articular cartilage, w/ underlying subchondral bone partially or completely detach and move freely in the joint space.

Can be acute or chronic. May present with signs of atrophy, pain and effusion.