Ottawa ankle rules, Weber classification, and stability assessment for ankle fractures. Evaluates medial clear space, syndesmosis, talar tilt, and treatment decisions.
The Ankle Fracture Treatment Calculator combines the Ottawa Ankle Rules for imaging decisions, Weber classification for fracture categorization, and stability metrics (medial clear space, tibiofibular clear space, talar tilt) to guide treatment decisions between conservative management and surgical intervention.
Ankle fractures are among the most common fractures in adults, with approximately 180 per 100,000 person-years. Treatment decisions hinge on two key factors: fracture pattern (Weber classification) and ankle mortise stability. Stable fractures can be managed conservatively with immobilization, while unstable fractures require open reduction and internal fixation (ORIF) to restore articular congruity and prevent post-traumatic arthritis.
This calculator implements the Ottawa Ankle Rules to determine imaging necessity (sensitivity ~98% for clinically significant fractures), classifies fractures by the Weber system (A/B/C relative to the syndesmosis), and evaluates stability using radiographic parameters. The tool integrates these assessments to provide a treatment recommendation backed by current orthopedic evidence. Check the example with realistic values before reporting.
Ankle fracture management requires integrating clinical examination, radiographic measurements, and classification systems. This calculator streamlines the decision process, reducing the risk of missed instability or unnecessary surgery. Keep these notes focused on your operational context. Tie the context to the calculator’s intended domain. Use this clarification to avoid ambiguous interpretation. Align this note with review checkpoints.
Ottawa Ankle Rules: X-ray if bone tenderness at malleoli/midfoot OR inability to weight-bear Stability criteria: Medial clear space ≤4 mm, Tibiofibular clear space ≤6 mm, Talar tilt ≤5° Weber A = stable, B = variable stability, C = unstable
Result: Unstable — Medial widened (5.5 mm), syndesmosis widened (7 mm). ORIF likely needed.
Weber B fracture with widened medial clear space (>4 mm) and tibiofibular overlap (>6 mm) indicates an unstable injury with deltoid and syndesmotic disruption requiring surgical stabilization.
Developed by Stiell et al. in 1992, the Ottawa Ankle Rules have been validated in over 40,000 patients across multiple emergency departments worldwide. Their near-perfect sensitivity (97.6%) for significant fractures means a negative Ottawa screen virtually excludes fracture, safely reducing unnecessary X-rays by 30-40% and saving significant healthcare costs.
Weber A fractures (below the syndesmosis) are typically stable and respond to conservative treatment. Weber B fractures (at the syndesmosis level) have variable stability — the key decision point is whether the medial structures (deltoid ligament) are intact. Weber C fractures (above the syndesmosis) imply syndesmotic disruption and are presumed unstable requiring surgical fixation.
Modern evidence supports early mobilization after stable fixation. Current protocols often allow early range-of-motion exercises within 1-2 weeks, protected weight-bearing at 2-4 weeks (based on fixation stability), and progressive strengthening starting at 6 weeks. Return to sport typically occurs at 12-16 weeks with full rehabilitation completion.
Clinical decision rules that identify which ankle injury patients need X-rays. They have ~98% sensitivity for significant fractures and can safely reduce imaging by 30-40%.
Medial clear space >4 mm on a mortise view suggests deltoid ligament disruption, making the ankle mortise unstable even in isolated lateral malleolus fractures. Use this as a practical reminder before finalizing the result.
Yes, if the ankle is stable (normal medial clear space, no syndesmosis widening, minimal talar tilt). Gravity stress or external rotation stress films help determine stability.
Weber C fractures, bimalleolar/trimalleolar fractures, fractures with >2 mm displacement, open fractures, and any fracture with mortise incongruity or instability on stress testing. Keep this note short and outcome-focused for reuse.
Measured 1 cm above the tibial plafond, it should be <6 mm. Widening suggests tibiofibular syndesmosis disruption, which increases ankle instability.
Non-operative: 6-8 weeks in boot/cast. Post-ORIF: 6-12 weeks non-weight-bearing, then gradual return. Full recovery including sports may take 4-6 months.