Pittsburgh Knee Rules

Purpose: The Pittsburgh Knee Rules were developed in order to determine the need for radiographs after acute knee injury secondary to the risk of fracture.

Stage of CPR Development: Validated.

Rule:

Blunt trauma or a fall as mechanism of injury PLUS either of the following:
1. Age older than 50 years or Younger than 12 years
2. Inability to walk 4 weight-bearing steps in the emergency department

Interpretation:

Study	Sensitivity	Specificity	NPV
Seaburg et al., 1994	1.00	0.79	100%
Bauer et al., 1995	1.00	N/A	100%
Seaburg et al., 1998	0.99	0.60	N/A
Simon et al., 2005	0.77	0.57-0.58	N/A
Cheung et al., 2013	0.86	0.51	98%