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Ottawa knee rule (Stiell 1995). Knee x-ray is indicated when any of: age 55 or older, bone tenderness at the fibular head, isolated patellar tenderness (caller-applied), inability to flex to 90 degrees, or inability to bear weight both imme

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Our latest check (2026-10-11)

Answering
Yes — valid x402 payment terms
Time to answer
204 ms
Price
$0.005 per call
Paying buyers, last 30 days
2 (directory's own records)
Paid calls, last 30 days
3
Category
Calculators and conversions
Address
https://api.magentlab.com/api/calc/ottawa_knee

Accuracy

Accuracy scores are published once a seller has enough paid checks against an independent record (at least 7 scored answers over at least 7 days). Until then no score is shown, and a missing score is never a pass.

For agents

This page as JSON: /sellers/bc1d4ea6f644.json. Paid lookup by address: GET /api/seller?resource=… ($0.001, x402).

Sellers can see the evidence behind their checks and ask for a re-check at [email protected].