ToolsCalculators
Recurrent Instability of the Patella (RIP) Score
Predicts long-term recurrence risk after a first-time patellar dislocation.
Recurrent Instability of the Patella (RIP) Score
Age at first dislocation
Skeletal immaturity (open physes)
Trochlear dysplasia (Dejour A-D)
Or lateral trochlear inclination <11 deg or trochlear depth <3 mm on MRI.
TT-TG / patellar length ratio >= 0.5
Result0 points
Low risk: about 0% 10-year recurrent instability.
- 10-year recurrence
- 0%
When to use
- Counselling patients on recurrence risk after a first-time lateral patellar dislocation.
Formula
Points: age <25 years = 2; skeletal immaturity = 1; trochlear dysplasia (Dejour A-D) = 1; TT-TG/PL ratio >=0.5 = 1. Range 0-5. Low 0-1 (0%), intermediate 2-3 (30.6%), high 4-5 (79.2%) 10-year recurrence.
Pearls and pitfalls
- High-risk patients may be considered for early stabilisation surgery rather than conservative management.