PMC9479503_01
A 22-year-old male after 6 weeks inability to bear full weight, subsequent to knee dislocation. Frontal radiograph of the right knee shows impaction fracture of the medial femoral condyle. Linear demineralization is seen involving the medial femoral condyle, lateral femoral condyle, and lateral tibial plateau (red arrows).
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F1
In addition, faint linear demineralization was observed involving the medial femoral condyle, lateral femoral condyle, and lateral tibial plateau [Figure 1].
Same patient as above. Images from non-contrast knee magnetic resonance imaging. (a) Coronal T2 fat-saturated imaging shows band-like subchondral T2 hyperintensity involving the femoral condyles and tibial plateau (yellow arrows). Also demonstrated was complete tearing of the ACL and PCL, partial tearing of the MCL, and an impaction fracture of the medial femoral condyle, (b) sagittal proton-density fat-saturated imaging shows band-like subchondral T2 hyperintensity involving the patella and lateral tibial plateau (blue arrows), (c) axial proton-density fat-saturated imaging shows band-like subchondral T2 hyperintensity involving the patella and trochlear groove (white arrows). Additionally there is an impaction fracture of the anterior medial femoral condyle with subperiosteal hematoma formation.
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F2
Additionally seen was linear increased T2 signal underlying the cartilage in all three compartments, suggestive of hyperemia in the setting of disuse osteopenia [Figure 2].