Advanced scores · Patellofemoral
Norwich Patellar Instability Score (NPI)
Condition-specific score developed specifically for patellar instability measuring patient confidence during activities that may provoke dislocation.
- 19 questions
- 5-8 min
- Score 0 to 100, lower is better
- Validated
About the NPI
Who it is for
Patients with patellar instability, recurrent patellar dislocation, or post-stabilization surgery (MPFL reconstruction, trochleoplasty).
What it measures
Patient confidence across 19 activities that may provoke patellar instability, from low-risk (lying in bed) to high-risk (pivoting sports).
Sections
- Multiple activity-specific items
Reading your score
0 = no instability problems, 100 = severe instability problems. Note: reversed direction from most scores.