The Recurrent Instability of the Patella (RIP) score is a straightforward tool for assessing the likelihood of recurrent patellar instability. It operates on the basis of four key questions. Each question pertains to specific patient characteristics or anatomical features, and each answer contributes numerically to the overall score, which reflects the risk level.

- The first question asks whether the patient is younger than 25 years. If "Yes," this condition adds 2 points to the score.
- The second consideration is whether the patient exhibits skeletal immaturity. Affirmative responses contribute 1 point.
- Third, the presence of Dejour A-D dysplasia is evaluated, and a "Yes" answer again adds 1 point.
- Finally, the relationship between the tibial tubercle to trochlear groove distance and patellar length is assessed. Specifically, if this ratio is 0.5 or greater, it contributes 1 more point.

Totaling these points, the RIP score can range from 0 to 5. This score then fits into one of three interpretive categories:

- Scores of 0 or 1 suggest a low risk of recurrent patellar instability. These patients likely face minimal recurring issues.
- Scores of 2 or 3 indicate an intermediate risk. These individuals may experience some degree of recurrent instability and should be observed accordingly.
- Scores of 4 or 5 imply a high risk, signaling a significant likelihood of recurrent instability that may necessitate more proactive intervention or management. 

This structured assessment helps in stratifying patients according to their risk level for effectively targeting treatment options or preventive care.

The Recurrent Instability of the Patella score, or RIP score, is a clinical calculator used in the field of orthopedics, specifically for patients with recurrent patellar instability. This scoring system is designed to predict the risk of recurrent patellar dislocation. It takes into account factors such as age, gender, trochlear dysplasia, patella alta, and tibial tuberosity-trochlear groove distance. 

The RIP score is particularly useful in guiding treatment decisions for patients with recurrent patellar instability, helping clinicians to determine whether conservative or surgical management is more appropriate. 

Exclusion criteria for the use of the RIP score may include patients with acute patellar dislocation, those with a history of knee surgery, or those with other significant knee pathologies that could influence patellar stability.

Recurrent Instability of the Patella score (RIP score)