These are ultrasound images of the right knee joint following a motorcycle accident. There is a curvilinear echogenic structure within the medial part of the right knee joint cavity. Diagnosis: traumatic rupture of the distal insertion of the medial cruciate ligament, which now floats within the fluid distended (possible hemorrhagic) joint space.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgSfY5OXJJYXV1WjKNO7v4XhYz-EzJ-PdF6vdM3EDK5BbOPfaJjFdPCGrpvrZ5YRehf5SfGjqTe8whjN8-PAYosCcJGtRqQQUSDkLdFluQ4ClD88Ht7hXf9yAMT7j9XyoCw6-ifBxmJ63Kv/s400/medial-cruciate-ligament-tear-1a.jpg)