about ultrasound findings of post-traumatic ulnar nerve subluxation
This is the case of a direct blow to a flexed elbow. The X-ray and Mri exams show a condylarfracture of the humerus, with a partial cortical bone detachment; a gross joint capsule distension is also evident.
Coronal Xbone-T1w Mri scan (0.3 Tesla) and Plain Radiography.
Coronal Stir (left) and T1w (right) Mri scans of the same patient (0.3 Tesla).
Why ultrasound in this case? Because after 1 month the patient feels pain on the posterior-medial aspect of the elbow, especially during the flexion-extension active movement, with distal pain irradiation to the forearm.
The dynamic ultrasound exam better depicts the clinical picture of a post-traumatic ulnar nerve subluxation at the sulcus ulnaris, togheter with a gross joint synovitis.
Axial T2w (left) and Stir (right) Mri scans of the same patient (0.3 Tesla).
This injury is considered in literature as the “least common of all tendon injuries”, and for this reason often misdiagnosed; I suggest always to pay attention when you find something “calcific“ after a trauma, especially with ultrasound imaging.
Today I show you the case of complete triceps tendon avulsion occurred after a falling injury that had happened eight days back.
Comparative examination between ultrasound scan and Sagittal T2w Mri Imaging (0.3 Tesla)
The X-ray examination still assumes great importance in this kind of injury.
Sagittal T2w Mri exam (0.3 Tesla) and plain radiograph of the same patient.