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Table 1: PRiSM (Pediatric Research in Sports Medicine) classification system for lateral discoid meniscus.17 |
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|
Component |
Description |
|
Width |
|
|
W0 |
Normal |
|
W1 |
Incomplete, wider than normal, covering < 90% of the tibial plateau |
|
W2 |
Almost complete/full, covering ≥ 90% of the tibial plateau |
|
Height |
|
|
H0 |
Normal, similar to a normal meniscus |
|
H1 |
Abnormal, greater than a normal meniscus |
|
Instability |
|
|
S0 |
Normal stability |
|
SA |
Abnormal stability in the anterior half of the meniscus |
|
SP |
Abnormal stability in the posterior half of the meniscus |
|
SAP |
Abnormal stability in the anterior and posterior meniscus |
|
Tear type |
|
|
T0 |
No tear or tear in the central/flatten zone |
|
THA |
Horizontal in the anterior half |
|
THP |
Degenerative/complex/radial |
|
THAP |
Tear location |
|
TDA |
Radial, complex, or degenerative tear in the anterior half |
|
TDP |
Radial, complex, or degenerative tear in the posterior half |
|
TDAP |
Radial, complex, or degenerative tear in the anterior and posterior halves |