Ankle Fracture

Your ankle isn't really a single joint — it's a ring of bone with three parts. The big shin bone (the tibia) ends in a knob on the inside of your ankle (the medial malleolus). The smaller leg bone (the fibula) ends in a knob on the outside (the lateral malleolus). Between them sits a small block of bone (the talus) that the whole leg pivots on. The two malleoli grip the talus like a wrench grips a nut — that grip is called the ankle mortise, and it's what keeps the joint surfaces lined up while you stand, walk, and push off.

An ankle fracture almost always happens from twisting — rolling the foot inward or outward as you misstep off a curb, plant awkwardly in a sport, or come down wrong off a stair. The direction the foot twists determines exactly which side of the ring breaks first and which ligaments tear next. Surgeons describe the pattern using a system called the Lauge-Hansen classification, but for you the punchline is simple: the ring can tolerate a single break and still hold its shape, but a break in two places almost always lets the joint drift.

That's the decisive question in every ankle fracture: not whether a bone is broken, but whether the ring is stable. A single fibula fracture with the talus still centered under the tibia is usually stable — it heals in a boot. A break that disrupts the ring on two sides (a bimalleolar fracture, or one malleolus broken plus the corresponding ligament torn) is unstable — the talus will drift under your body weight and the joint surface will heal misaligned, leading to early arthritis. Unstable patterns get fixed in the operating room. Stability is what drives the decision, not how dramatic the X-ray looks.

Symptoms

You'll usually know the moment it happens. A sharp twist, immediate pain, often a snap or pop, and an ankle that goes from supporting weight to refusing to. Within an hour or two the ankle swells dramatically, the skin around the malleoli tightens, and bruising spreads down toward the toes. Bearing weight is usually impossible, or at most produces a hobbling few steps. The pain localizes well — point tenderness directly over the bony knob on the inside or outside of the ankle is the classic finding, and a stable injury without that bony tenderness is almost always a sprain rather than a fracture (the basis of the Ottawa Ankle Rules that decide whether an X-ray is needed at all).

What's not typical: numbness, loss of pulses in the foot, severe pain out of proportion to the injury, or a foot that's grossly deformed and pointing the wrong direction. Those are warnings that the broken bones have stretched or compressed a nerve, kinked the artery feeding the foot, or created a real risk of compartment syndrome — all of which need urgent evaluation rather than a clinic appointment next week. The same goes for any break that's come through the skin (an open fracture) — that's a same-day surgical problem because the bone is now contaminated and the infection clock is running.

Diagnosis & Evaluation

Evaluation begins at the bedside. The surgeon palpates the malleoli and the length of the fibula for tenderness, inspects the skin for blistering or tension, checks the neurovascular exam, and tests whether the patient can bear weight — the Ottawa Ankle Rules give a structured way to decide whether imaging is needed at all. Standard AP, lateral, and mortise X-rays characterize the fracture pattern and, most importantly, show whether the talus sits centered in the mortise. CT is added for complex pilon fractures, posterior malleolus involvement, or preoperative planning. When an isolated fibula fracture is found but the medial side of the ankle is tender, a gravity stress view or external rotation stress X-ray is used to unmask occult mortise instability that a resting film can miss.

Non-Surgical Treatment

1. Walking Boot or Short-Leg Cast

   Stable isolated lateral malleolus fractures without mortise widening are managed in a removable boot with protected weight-bearing until the fracture is reliably painless and the X-ray shows healing.

2. Protected Weight-Bearing

   Stable patterns tolerate early weight-bearing in the boot; unstable patterns or those at risk of displacement are kept non-weight-bearing until the surgeon confirms the fracture is holding position.

3. Serial Imaging

   Repeat X-rays out of the boot confirm the talus has not drifted. Any late displacement changes the plan toward surgery.

When Surgery Is Considered

Surgery is offered when the ankle cannot be trusted to hold its shape under body weight — any mortise instability, bimalleolar or trimalleolar patterns, talar shift on weight-bearing films, syndesmotic disruption, and open injuries. The goal is to restore the ring: fibular length and rotation, medial buttress, posterior-malleolar support, and syndesmotic alignment.

Ankle fracture ORIF is the primary operation, with plate-and-screw fixation of the fibula, screws or a small plate medially, and syndesmotic fixation when needed. Fractures that extend into the weight-bearing tibial plafond (pilon injuries) are typically coordinated through a regional Level-1 trauma center in San Antonio.

If non-operative care is not enough, these procedures are offered by the OSI team for this condition:

• Ankle fracture ORIFFoot & Ankle

Providers Who Treat Ankle Fracture

Michael S. Vrana, M.D.

David B. Templin, M.D.

Trent Twitero, M.D.

External patient-education references and related OSI pages for additional background:

• Britannica — Bone disease (fractures)
• Britannica — Ankle (anatomy)
• AAOS OrthoInfo — patient education library
• OSI glossary — orthopedic terminology in plain language