Foot and Ankle Fracture vs Sprain 2026 | DPM

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Feature	Ankle/Foot Sprain	Ankle/Foot Fracture	Clinical Significance
Mechanism	Ligament stretch/tear from inversion, eversion, or rotation	Bone failure from direct impact, axial load, or torque	History alone does not distinguish
Bruising location	Anterior lateral (ATFL zone)	May be diffuse; bony point tender (fibula, 5th MT base, navicular)	Bony point tenderness = X-ray required
Ottawa Ankle Rule	Negative — no bony tenderness at malleoli or navicular	Positive — bony tenderness at posterior malleolar tip or navicular	99% sensitivity for fracture; avoids unnecessary X-rays
Ottawa Foot Rule	Negative — no 5th MT base or navicular tenderness	Positive — 5th MT base or navicular point tender; cannot WB 4 steps	Identifies midfoot and base-of-5th-MT fractures
Weight-bearing ability	Usually can bear weight (painful)	Often cannot bear weight 4 steps immediately	Cannot bear weight = higher fracture probability
X-ray	Normal bone (stress fractures will also be X-ray negative initially)	Cortical break, displacement, avulsion fragment	Stress fractures require MRI or bone scan

Condition Often Confused	Key Distinguishing Feature	Test to Order	Consequence of Missing
Jones Fracture vs lateral ankle sprain	5th MT base point tenderness (proximal diaphysis vs styloid)	Foot X-ray; Ottawa Foot Rule	Jones fracture nonunion if treated as sprain
Lisfranc injury vs midfoot sprain	Plantar ecchymosis; weight-bearing X-ray diastasis	Bilateral weight-bearing AP foot X-ray	Progressive midfoot collapse; post-traumatic arthritis
5th MT avulsion vs peroneal tendon tear	Avulsion at styloid vs peroneal subluxation proximal	Foot X-ray; MRI if peroneal tear suspected	Peroneal tear missed; instability undertreated
Syndesmotic injury vs lateral sprain	Squeeze test positive; external rotation stress pain	Mortise X-ray; MRI; stress fluoroscopy	Syndesmotic instability → ankle incongruency → arthritis
Talar OCD vs ankle sprain	Persistent pain 4–6 weeks after sprain; medial talar dome tenderness	MRI	Osteochondral lesion progression; loose body

You rolled your ankle or dropped something on your foot. Now you’re asking the question every injured person asks: is it broken? The answer matters because treatment is different — and getting it wrong in either direction has consequences.

Sprains: What’s Actually Injured

An ankle sprain is a stretch or tear of a ligament — the fibrous tissue that connects bones. Most ankle sprains involve the lateral (outside) ligaments, particularly the anterior talofibular ligament (ATFL). Sprains cause pain, swelling, bruising, and difficulty walking, but the bones are intact.

Fractures: When Bone Breaks

A fracture is a break in one or more bones. In the ankle, the fibula and tibia form the mortise; fractures most commonly affect the lateral malleolus (end of the fibula). In the foot, the metatarsals, navicular, and calcaneus are common fracture sites. Even non-displaced fractures require appropriate treatment to heal correctly.

The Ottawa Ankle and Foot Rules

The Ottawa Rules are validated clinical guidelines for determining when X-rays are needed after ankle injury. An ankle X-ray is indicated if there is pain around the ankle bones plus either bone tenderness at the back edge or tip of the lateral or medial malleolus, or an inability to walk 4 steps. A foot X-ray is indicated if there is midfoot pain plus either bone tenderness at the navicular or the base of the 5th metatarsal, or an inability to walk 4 steps. These rules are highly sensitive for fractures.

Clinical Clues That Suggest Fracture

Point tenderness directly over a bone (vs. soft tissue tenderness) strongly suggests fracture. The sound or feeling of a “pop” or “snap” can occur with both sprains and fractures, so it’s not definitive. Rapid, severe swelling within the first hour suggests bleeding around a fracture. Inability to bear any weight also raises fracture concern.

When to Get an X-Ray

If you meet any of the Ottawa criteria, or if you’re uncertain about the severity of your injury, get an X-ray. Missing a fracture means it may heal in a malposition, never heal at all, or require later surgery that could have been avoided. Stress fractures in particular are commonly missed as simple strains.

Treatment Differences

Grade I and II sprains: RICE, functional bracing, early weight-bearing as tolerated, physical therapy. Grade III sprains: possible short-term immobilization, then rehabilitation. Non-displaced fractures: boot or cast immobilization. Displaced or unstable fractures: surgical fixation.

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