Overview
The ankle is a hinge formed by three bones: the tibia, whose inner knob is the medial malleolus; the fibula, whose lower end is the lateral malleolus; and the talus, which sits between them. The malleoli and the ligaments binding the tibia to the fibula (the syndesmosis) form a mortise that holds the talus centered. An ankle fracture is a break of one or more malleoli, and what matters is whether the talus is still perfectly seated; shifted even 1 to 2 mm, it loses a large share of its contact area and the cartilage wears out.
Treatment therefore turns on stability. A fracture of the fibula alone, with the mortise intact and the inner ligament undamaged, heals in a boot. A fracture with the talus displaced, with both sides of the ankle broken, or with the syndesmosis torn is unstable and is fixed surgically so the joint heals in its exact anatomic position.
Common Symptoms
- Immediate, severe pain after a twist, fall or misstep, with swelling within the hour
- Bruising that spreads over the ankle and into the foot and toes over the next day
- Tenderness directly over the bony knobs on either side of the ankle, rather than over the soft tissue in front of them
- Inability to take four steps, at the time of injury or in the clinic
- Visible deformity, which means a dislocation and needs the emergency department
The most common mimic is a bad ankle sprain, which hurts over the ligaments rather than the bone; only an X-ray settles it. Deep ankle pain months after either injury may be an osteochondral lesion of the talus, and a pop at the back of the ankle with weak push-off is an Achilles rupture.
Causes & Risk Factors
Most ankle fractures are rotational: the foot is planted and the body turns over it, in a soccer tackle, a step off a curb, a fall on a boat deck or a ski binding that did not release. The direction of the twist determines which bones break, so the X-ray pattern tells Dr. O'Donnell about the ligaments as well. Younger patients break ankles in sport and typically have good bone with unstable patterns; patients over 60 more often fall from standing height, and osteoporosis, diabetes and smoking slow healing and weaken fixation.
How It Is Diagnosed
Dr. O'Donnell palpates the medial and lateral malleoli, the base of the fifth metatarsal and the navicular, tests whether you can bear weight, and checks for tenderness over the inner deltoid ligament and along the fibula up to the knee, because a high fibula fracture with a torn syndesmosis (a Maisonneuve injury) can be mistaken for a medial ankle sprain. The squeeze test and the external rotation stress test screen the syndesmosis.
Three X-ray views, including the mortise view, show the fracture and the position of the talus. In an isolated fibula fracture, a weight-bearing or stress X-ray determines whether the deltoid ligament is intact, which is the difference between a boot and an operation. CT is ordered when the posterior malleolus is involved or the fracture enters the joint surface; MRI is used for suspected syndesmosis or cartilage injury when X-rays are equivocal. Patients injured while traveling can upload their films through mymedicalimages.com.
Treatment Options
Non-operative care
Stable fractures, meaning an isolated lateral malleolus fracture with the talus centered and no medial injury, or a non-displaced medial or posterior fragment, are treated in a walking boot for about 6 weeks weight bearing as tolerated. X-rays are repeated at 1 and 2 weeks to confirm the fragment has not moved, then at 6 weeks for healing. Ankle motion begins early out of the boot, and therapy restores strength and balance from week 6.
Ankle fracture fixation (ORIF)
Unstable fractures are treated with open reduction and internal fixation: bimalleolar and trimalleolar fractures, any fracture with the talus shifted on the mortise view, a fibula fracture with a torn deltoid ligament, and fractures with a syndesmosis injury, which is stabilized with a screw or a suture-button device. The fibula is fixed with a plate and screws and the medial malleolus with screws, restoring length and rotation exactly, as an outpatient at Bayside Surgery Center once swelling permits.
Recovery & What to Expect
The healing bone, not the hardware, has to carry the load, so weight bearing is protected until the fracture has united; a fixed syndesmosis extends that period.
| Phase | Timing | What happens |
|---|---|---|
| Protection | Weeks 0–2 | Splint then boot; non-weight-bearing on crutches; toe, knee and hip motion; elevation; no ankle motion until incisions have healed |
| Motion | Weeks 2–6 | Still non-weight-bearing; active ankle motion out of the boot in all four directions; gentle stretching; scar care; X-rays checked for healing |
| Weight bearing & strength | Weeks 6–12 | Progressive weight bearing when cleared; wean crutches and boot to a shoe; band and calf-raise strengthening; balance; gait training |
| Return to activity | Months 3–6 | Progressive strengthening and balance; running and agility as tolerated; sport-specific drills; cleared on symmetric strength and balance |
Desk work is possible within days with the leg elevated; driving an automatic resumes when the boot is off and, for a right ankle, when you can brake hard without hesitation, usually 8 to 10 weeks; running starts around month 3 and sport at 3 to 6 months. The full protocol is available as a PDF: ankle fracture ORIF.
Frequently Asked Questions
Can I walk on a broken ankle?
On a stable fracture, yes, in a walking boot as soon as pain allows, and it does not harm healing. On an unstable fracture, no: walking shifts the talus and worsens the injury. Most people can hobble on either, so that proves nothing; a twist with bony tenderness needs an X-ray.
How long does a broken ankle take to heal?
Bone unites in about 6 weeks whether the fracture is treated in a boot or with plates and screws. Strength, balance and a normal gait take another 6 weeks of therapy, and swelling can persist for months. Sport returns at 3 to 6 months once strength and balance match the other side.
Do I need surgery for an ankle fracture?
Only if the fracture is unstable. An isolated fibula fracture with the talus centered on the mortise view heals in a boot. Fractures on both sides of the ankle, any shift of the talus, a torn deltoid ligament or a torn syndesmosis need plate-and-screw fixation so the joint heals in its exact position and does not wear out early.
When can I drive after an ankle fracture?
For a left ankle and an automatic car, as soon as you are off narcotic pain medication. For a right ankle, not until the boot is off and you can stamp on the brake without hesitation, typically 8 to 10 weeks. Driving in a boot is unsafe.
Will the plate and screws need to come out?
Usually not. Hardware is removed only if it irritates the thin skin over the fibula, or if a syndesmosis screw was used rather than a suture-button device, in which case removal at about 3 months is planned. Otherwise the plate stays for life without causing trouble.
This page is for general education and is not a substitute for a medical evaluation. Treatment recommendations depend on your individual diagnosis and goals. Kevin O'Donnell, MD sees patients from Coral Gables, Miami, Brickell, Pinecrest and Coconut Grove at 475 Biltmore Way, and out-of-town patients by telemedicine.