Mochizuki et al reported a score for evaluating a patient with an acute traumatic dislocation of the patella. This can help to identify a patient who may benefit from more aggressive management. The authors are from Nigata University in Japan.
Patient selection: acute patellar dislocation
Parameters:
(1) age of the patient in years
(2) sports injury
(3) hemarthrosis
(4) bone fragment on imaging studies
(5) lateral shift
(6) trochlea dysplasia
Parameter
Finding
Points
age
< 20
2
>= 20
0
sports injury
no
0
yes
1
hemarthrosis
no
0
yes
1
fragment
no
0
yes
3
lateral shift
no
0
yes
1
trochlea dysplasia
no
0
yes
2
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 10
Total Score
Risk Group
Recurrence Rate
0 to 4
low
5%
5 to 7
medium
48%
8 to 10
high
91%
Performance:
• The area under the ROC curve is 0.89.
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