Lateral Ankle Sprain


What is a Lateral Ankle Sprain 

A lateral ankle sprain is a very common injury that occurs when the foot rolls underneath the ankle or leg (see picture below)

The structures that can be injured on the outside of the ankle are shown in the picture below

How the foot lands when the injury occurs will change the structures that are injured.

 


Causes of an Lateral Ankle Sprain

An inversion ankle injury is an acute injury that results in landing on the ankle in an inverted position.

The risk of an ankle inversion injury is increased with:

  • Specific sporting activities (basketball, soccer, netball)
  • Previous ankle sprains
  • Hypermobile joints
  • High arched foot
  • Metatarsus adductus foot posture
  • Long feet
  • Poor non supportive footwear

 


Diagnosis of a Lateral Ankle Sprain

Diagnosis is usually based or symptoms and a complete assessment of your foot and ankle.

X-ray and CT scans can help determine any injuries to bones

Ultrasound and MRI are beneficial when investigating the soft tissue effected

 


Classification

Typically ligaments are injured after an ankle sprain – for a complete list of the structures that can be impacted see the next section.

Because ankle sprains typically involve only ligaments they are graded in the same way.

Grade 1:  Stretching, small tears

Grade 2: Larger partial tear

Grade 3 Complete tear


Structures injured with an Lateral Ankle Sprain

Structures that are commonly involved with a lateral ankle sprain are the:

Anterior talo-fibular ligament (ATFL) – Click for more information

Structures that can also be injured although not as common:

Peroneal Tendons – Click for more information

Calcaneo-fibular ligament- Click for more information

Ankle Sydesmosis (Anterior Tibio-fibular ligament) – Click for more information

Ankle Sydesmosis injury (Posterior Tibio-fibular ligament) – Click for more information

Calcaneo-fibular – Click for more information

Fibular fracture – Click for more information

Avulsion fracture of the fibular- Click for more information

Avulsion fracture of the 5th metatarsal- Click for more information

Avulsion fracture of the talus- Click for more information

Osteochondral lesion of the talus – Click for more information

Bifurcate ligament injury – Click for more information

 

 


Treatment of Lateral Ankle Sprain

Treatment will depend on the structures affected (click above for more information)

Typically treatment will involve RICE

R- rest

I – ice

C – compression

E- elevation

 

Other treatments can include:

CAM walkers (Moon Boots)

Lace up ankle bracing

Rehabilitation exercises with a strengthening program

More supportive shoes

Surgery

 


 

Call The Foot and Ankle Centre for diagnosis and advice on professional management and treatment options.