DX
Complete rupture of the CCL with mild joint effusion, synovial thickening and suspected traumatic intraarticular hematoma. Suspected mild degeneration of the lateral meniscus without fissure/rupture. Mild exostosis of the recess/groove of the extensor digital longus.
Outcome
The sonographic findings are pathognomonic for a complete rupture of the CCL. I suspect a traumatic intraarticular hematoma which would match with the acute onset/reported history. Damage of the collateral ligaments and the menisci is not obvious. The mildly inhomogeneous texture of the lateral meniscus is most probably consistent with degenerative changes on a microscopic level and not of clinical relevance.
