A new study in the January issue of Radiology found that an ultrasound can now be used to detect a posterior shoulder dislocation in infants 3 to 6 months old with a permanent brachial plexus birth injury (BPBI). A doctor from Finland performed ultrasonography to screen for posterior shoulder subluxation in 132 infants with brachial plexus at various times. Their research showed that posterior shoulder subluxation of the humeral head developed in one-third of the 27 patients with permanent BPBI that failed to heal in the first year. It was detected by ultrasound in 55 percent of patients at 3 months of age and in 89 percent of patients at 6 months of age. The ultrasound has proved to be a useful tool for diagnosis of a birth injury. It should be performed on the glenohumeral joint at age 3 and 6 months of age if the symptoms persist. To learn more about the ultrasound therapy, please click the link.