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Ottawa Knee Rules suggest a knee X-ray series is only required for knee injury patients with any of these 5 findings: 1. Age 55 or older 2. Isolated tenderness of the _________ (that is, no bone tenderness of the knee other than the patella). 3. Tenderness at the head of the __________ 4. Inability to flex to 90 degrees. 5. Inability to bear weight both immediately and in the emergency department (4 steps; unable to transfer weight twice onto each lower limb regardless of limping).

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