Degree of injury for acetabulum and femoral head.
|Grade 0: normal cartilage||10||1.5|
|Grade 1: fibrillation||95||13.8|
|Grade 2: wave sign||281||41.0|
|Grade 3: cleavage tear between labrum and articular cartilage||210||30.6|
|Grade 4: exposed bone in the acetabulum||90||13.1|
|Cartilage injury ≥ Grade 2||581||84.7|
|Femoral head (ICRS)|
|Grade 0: normal cartilage||521||75.9|
|Grade 1: nearly normal||52||7.6|
|Grade 2: abnormal||68||9.9|
|Grade 3: partial loss of cartilage||29||4.2|
|Grade 4: exposed bone||16||2.3|
|Cartilage injury ≥ Grade 2||113||16.5|
|Combined cartilage injury|
|Acetabulum OR femoral head cartilage injury ≥ Grade 2||601||88.2|
|Acetabulum AND femoral head cartilage injury ≥ Grade 2||93||13.6|
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