Pareek et al reported the SIFK score for predicting the risk of arthroplasty on a patient with subchondral insufficiency fracture of the knee (SIFK). The authors are from the Mayo Clinic.
Subchondral insufficiency fractures of the knee was previously known as spontaneous osteonecrosis of the knee (SONK). This is associated with small fractures of subchondral bone assoicated with mechanical overload in an older patient.
Parameters:
(1) Kellgren-Lawrence Grade, from 1 to 4
(2) SIFK on medial femoral condyle (MFC)
(3) lateral meniscus root tear
(4) lateral meniscus extrusion
(5) medial meniscus extrusion
Parameter
Finding
Points
Kellgren-Lawrence grade
< 4
0
4
2
SIFK on MFC
no
0
yes
2
lateral meniscus root tear
no
0
yes
2
lateral meniscus extrusion
no
0
yes
4
medial meniscus extrusion
no
0
yes
1
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 11
Total Score
Risk Group
Risk of Arthroplasty
0 to 2
low
8.8%
3 or 4
medium
40.4%
5 to 11
high
78.9%
Performance:
• The area under the ROC curve is 0.83.
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