Recurrent Instability of the Patella (RIP) Score of Hevesi et al

Description

Hevesi et al reported the Recurrent Instability of the Patella (RIP) score for evaluating a patient with a lateral dislocation of the patella. This can help to identify a patient at risk for recurrence. The authors are from the Mayo Clinic.

Patient selection: after first lateral dislocation

Patient exclusion: chronic patellar subluxation

Parameters:

(1) tibial tubercle to trochlear groove distance (TT-TG)

(2) patellar length (PL)

(3) age of the patient in years

(4) skeletal immaturity (primarily pediatric patients)

(5) trochlear dysplasia (using the Dejour et al classification)

TT-TG to PL ratio =

= (TT to TG) / (PL)

Parameter	Finding	Points
age	< 25	2
	>= 25	0
skeletal immaturity	present	1
	absent	0
trochlear dysplasia	absent	0
	present	1
ratio of TT-TG/PL	< 0.5	0
	>= 0.5	1

total score =

= SUM(points for all of the scored parameters)

Interpretation:

• minimum score: 0

• maximum score: 5

• The higher the score the greater the risk of recurrent dislocation.

Score	Risk of Recurrent Dislocation	10-Year Risk of Recurrent Dislocation
0 or 1	low	0%
2 or 3	intermediate	31%
4 or 5	high	79%

Performance:

• The area under the ROC curve is 0.875.

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Recurrent Instability of the Patella (RIP) Score of Hevesi et al

Description

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