MDCalc

Pittsburgh Knee Rules

Defines when knee x-rays are unnecessary, based on the Pittsburgh rules.

Mechanism: blunt trauma or fall

Age <12

Age >50

Unable to bear weight in ED (4 steps, limping is allowed)

Result:

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Advice

Patients who do not meet the Pittsburgh decision rules do not need an x-ray. If one of the conditions are met, then x-ray is recommended.

Management

For significant non-bony injuries, often crutches and a knee immobilizer can be helpful to assist with ambulation.

Critical Actions

Patients who do not meet the Pittsburgh decision rules do not need an x-ray. If one of the conditions are met, then x-ray is recommended.