Humeral avulsion of the posterior band of the inferior glenohumeral ligament: MR arthrography and clinical correlation in 17 patients.

OBJECTIVE: The purpose of this article is to describe the MR arthrography findings of humeral avulsion of the posterior band of the inferior glenohumeral ligament in 17 patients. To elucidate the clinical importance of this abnormality, we also correlate our imaging findings with the presence of coexisting structural abnormalities; clinical presentation; and, when available, arthroscopic evaluation (n = 8). CONCLUSION: Humeral avulsion or insufficiency of the posterior band of the inferior glenohumeral ligament can be easily detected using MR arthrography. This ligamentous abnormality may be seen in isolation, or it may occur in conjunction with posterior or, less often, anteroinferior capsulolabral abnormalities. The presence of this lesion in a subgroup of patients with the clinical diagnosis of multidirectional instability may offer insight into the causes and pathogenesis of this complex entity.

MR imaging of soft-tissue masses of the foot.

As with other parts of the musculoskeletal system, the soft tissues of the foot can be affected by a wide variety of pathologic entities including trauma, congenital abnormalities, infections, and neoplastic disorders. While plain radiographs are usually the initial examination for evaluation of pathology, magnetic resonance imaging (MRI) is critical to evaluate for abnormalities within the ligaments, tendons, and other nonosseous structures within the foot. The constellation of clinical and MRI findings often allows a relatively specific diagnosis to be rendered. This article discusses both benign and malignant processes within the soft tissues of the foot and presents their characteristic imaging findings with MRI.