cliot (version 1.0.0)

rip_patella_score: Recurrent Instability of the Patella (RIP) Score

Description

Calculates the RIP Score to predict the risk of recurrent patellar dislocation. The score utilizes four clinical and radiographic factors: age, skeletal maturity (open physes), trochlear dysplasia, and history of contralateral dislocation.

Usage

rip_patella_score(age, skeletal_immature, trochlear_dysplasia,
                  contralateral_dislocation)

Value

A list containing:

RIP_Score

The calculated total score (Range 0-5).

Risk_Category

Classification (Low 0-1, Intermediate 2-3, High 4-5).

Recurrence_Risk

Estimated percentage risk of recurrence.

Arguments

age

Numeric. Patient age in years. (< 25 years adds 2 points).

skeletal_immature

Numeric (0 or 1). Are physes open (skeletally immature)? (1 = Yes, +1 point).

trochlear_dysplasia

Numeric (0 or 1). Presence of trochlear dysplasia on lateral radiograph. (1 = Yes, +1 point).

contralateral_dislocation

Numeric (0 or 1). History of contralateral patellar dislocation. (1 = Yes, +1 point).

References

Cheung JP, Fung B, Ip WY, Chow SP. Review on recurrent dislocation of the patella. Orthopedics. 2008;31(1):76-80. Hevesi M, Heckmann N, Brown GA, et al. The Recurrent Instability of the Patella (RIP) Score: A Statistically Based Predictive Tool for Recurrent Patellar Instability. Am J Sports Med. 2019;47(4):922-928. doi:10.1177/0363546518825255

Examples

# Example 1: High Risk
# 16yo (+2), Open Physes (+1), Dysplasia (+1), No contralateral history
# Score = 4
rip_patella_score(16, 1, 1, 0)

# Example 2: Low Risk
# 30yo (0), Closed Physes (0), Dysplasia (1), No contralateral history
# Score = 1
rip_patella_score(30, 0, 1, 0)