A trimalleolar fracture is a severe ankle injury that involves three parts of the ankle joint:
- The lateral malleolus (on the outer part of the fibula)
- The medial malleolus (on the inner part of the tibia)
- The posterior malleolus (on the back of the tibia)
This type of fracture significantly affects ankle stability and often involves injury to the syndesmosis. The syndesmosis are the ligaments that hold the tibia and fibula together.
Trimalleolar fractures are almost always considered unstable and typically require surgical management. For this reason, if a patient is seen in Access Ortho with a Trimalleolar Fracture, they will be referred for surgical care.
Mechanism of Injury
The mechanism of injury for most trimalleolar fractures includes:
- High-energy trauma, such as car accidents or high-impact sports collisions.
- Twisting injuries during activities like netball, football, or trail running.
- Falls, particularly from heights or onto uneven ground.
Because this injury involves both bone and ligament structures, it often results in significant pain, swelling, and joint instability.
Symptoms and Diagnosis of a Trimalleolar Fracture
The symptoms of a trimalleolar fracture often include:
- Immediate, severe pain at the ankle
- Swelling and rapid bruising
- Inability to walk or bear weight
- Visible deformity in some cases
- A feeling that the ankle is “giving way” or unstable
If you have a visible deformity after an ankle injury, it is important to attend the nearest hospital emergency department as soon as possible.
Diagnosis
Accurate diagnosis is essential. To ensure a correct diagnosis, you will require a physical examination by a skilled medical provider. X-rays (AP, lateral, and mortise views) will be arranged to confirm the fracture pattern and displacement. Some patients will require a CT scan or MRI scan to assess the fracture and evaluate ligament injuries or syndesmotic damage.
Treatment Approaches for a Trimalleolar Fracture
Treatment for a trimalleolar fracture almost always involves surgery due to the unstable nature of the injury.
The most common surgery is Open Reduction and Internal Fixation (ORIF), where the bones are realigned and stabilised using metal plates and screws.
If the syndesmosis is disrupted, it may also require surgical stabilisation with screws or suture devices.
After surgery, the ankle is usually placed in a moon boot or splint, and non-weight bearing status is maintained for several weeks.
In rare cases where surgery is unsuitable (e.g. due to medical risk), a non-operative approach may be used, but only with close supervision and regular imaging to ensure joint alignment remains intact.
Prognosis for a Trimalleolar Fracture
Most trimalleolar fractures heal well with proper surgical management and rehabilitation, although recovery takes time and effort. Bone healing takes 6-8 weeks, while full recovery and return to normal activity can take 4-6 months.
Swelling, stiffness, and reduced motion are common for extended periods after a serious ankle injury.
With good rehab, most people regain the ability to walk, return to work, and even return to sport, although some high-impact activities may need to be modified.
In some cases, especially if the joint cartilage was damaged, patients may develop post-traumatic arthritis years after the injury.
How Access Ortho Can Help with Trimalleolar Fractures
Access Ortho offers timely, specialised care for patients with ankle injuries. Our team can manage acute injuries promptly and thoroughly. You don’t need a referral to see us.
Our clinics provide referrals for and immediate review of imaging, allowing for rapid diagnosis and assessment of your fracture. During your visit, we can supply a moon boot or splint to stabilise the injury and reduce discomfort. For more complex cases, we arrange streamlined referrals, ensuring you receive care without unnecessary delays.
If your injury is managed conservatively, we will continue your care with follow-up imaging, regular reviews, and clear guidance on your recovery timeline. We also support your rehabilitation process, helping you regain movement, strength, and confidence as you return to regular activity.