Before starting on this section, it is vital that you can answer the following questions:
- What are the 7 tarsal bones?
- Which joint is responsible for inversion and eversion of the ankle joint?
- What are the lateral ligaments and what is their origin and attachments?
Not quite sure what the answers are? Do not worry, click on the button below!
After completing the “Ankle Sprain” section, you will be able:
- To apply knowledge of the ankle joint to explain the pathophysiology
- To explain the clinical presentation and immediate management
- To describe the diagnosis
- To discuss the management
- To validate knowledge by completing the quiz
Inversion (Lateral) Ankle Sprain
Sport Risk Factors
Running and jumping sports such as football, squash, tennis and basketball.
Cristiano Ronaldo, the 4-time world football player of year, goes to change direction with the ball but rolls his right foot inwards. He immediately goes down with pain on the outside of his ankle. However, he is able to get up and walk over to the sidelines to be subbed off.
Sprain vs Strain
- Sprain = injury to ligaments
- Strain = injury to muscles (tendons)
TIP: sTrain has a ‘T‘, and Tendon starts with a ‘T‘.
The most common type of ankle sprain is an inversion (lateral) ankle sprain (85%), described in detail on this page:
1. Inversion injury, involving twisting of weight-bearing plantar-flexed foot.
2. Injures the anterior talofibular and calcaneofibular ligament of the lateral ligaments
- The lateral ligaments aim to resist over-inversion movement, however the anterior talofibular ligament is the weakest of these, hence it is more prone to injury from over-inversion.
- Stiffness and tenderness over the lateral ligament
- Pain on inversion
- Swelling (inflammation) and bruising (immediate → 48 hours)
- Follow the Ottawa ankle rules to decide if an immediate x-ray is needed to rule out a # (fracture) of the ankle and mid-foot.
Ottawa ankle rules:
- A decision aid to exclude fractures of the ankle in patients with an ankle sprain. Rule out an order to x-ray the patient for a suspected ankle fracture (as a differential) if 3 things are NOT present with pain in the malleolar zone:
1. Bone tenderness in the posterior edge of the lateral malleolus
2. Inability to weight bear immediately and in ED
3. Bone tenderness in the posterior edge of medial malleolus
TIP: * Mnemonic Alert * If it is an ankle fracture, then you are hanging off a LIMb
L: Lateral malleolus (bone tenderness)
I: Inability to weight bear
M: Medial malleolus (bone tenderness)
- Clinical diagnosis and examination
- Ottawa ankle rule to rule out an ankle fracture
Classification of an ankle sprain is by grades I-III:
- Grade I (mild): stretched ligament or small tears
- Grade II (moderate): incomplete tear
- Grade III (severe): complete tear, causing mechanical instability of the joint.
Progression of management depends on the grade of the ankle sprain.
If Grade I:
1. PRICE +/- analgesia.
TIP: * Mnemonic Alert * PRICE
- P: Protection from further injury
- R: Rest from activity 48-72hrs
- I: Ice applied to the affected area
- C: Compression of the ankle joint with an elasticated bandage
- E: Elevation of the ankle joint above the level of the heart
If Grade II/III:
- Below knee immobilisation for 10 days
Baldwin A, Hjelde N, Goumalatsou C, Myers G. (2016). Oxford Handbook of Clinical Specialities. 10th ed. Oxford: Oxford University Press.
Moore K, Dalley A, Agur A. (2014). Clinically Oriented Anatomy. 7th ed. Philadelphia: Wolters Kluwer.
National Institute for Health and Care Excellence: Clinical Knowledge Summaries. (2016). Sprains and strains. [online]. Available at: https://cks.nice.org.uk/sprains-and-strains#!topicsummary [accessed 1 March 2017].
Teach Me Anatomy. (2017). The Ankle Joint. [online]. Available at: http://teachmeanatomy.info/upper-limb/joints/elbow-joint/ [accessed 1 March 2017].