MRI performed five days later shows an about 20 mm osteochondral defect of the lateral femoral condyle, and a matching thin articular loose body on the border of the lateral recess, best depicted in the coronal plane.
Substantial inhomogeneous joint effusion indicating hemarthrosis.
Laterally subluxated patella, edema at the medial patellofemoral ligament (MPFL) attachment. Inhomogeneously fibrillar MPFL indicating high-grade rupture, resultant soft tissue edema.
Inhomogeneously edematous lateral vastus muscle compartment indicating simultaneous muscle injury.
Some sequences are degraded by motion artifacts, but the exam is altogether diagnostic, no sedation was required.