Ulnar collateral tear on ultrasound. The ligament has torn off the base of the proximal phalynx and has not healed 6 weeks after the injury. There is no avulsion fracture. No Stener lesion is noted. Note that these patients will seem stable if examined in extension with an intact volar plate. They need to be stressed in flexion (which is hard to image!). If the volar plate is also torn, they will be unstable in flexion and extension.