Presentation
Soccer - minor trauma. Mechanism not given. Decreased range of motion
Patient Data
Age: 24
Gender: Male
From the case:
Medial femoral condyle avulsion fracture

Small osseous fragemt adjacent to medial femoral condyl can be avulsion fracture or dystrophic calcification from previous trauma.
There is no cortication of this fragment therefere it is not an old osseous fragment.
Large joint effusion in the context of trauma is likely to be a hemarthrosis.