Jon Arthur Jacobson

Learn More
The infrapatellar fat pad of Hoffa is an intracapsular structure that is routinely visualized on magnetic resonance images of the knee. Because disease in this region is not uncommon, it is important to be familiar with the various pathologic entities that may occur here. Abnormalities that are intrinsic to this fat pad include Hoffa disease, intracapsular(More)
Ultrasound was used to effectively diagnose and precisely locate a torn interosseous membrane in 2 forearm fracture/dislocations. The ultrasound appearance of the torn interosseous membrane in cadavers and in the fractures/dislocations shows disruption of the anterior and posterior layers in midsubstance or adjacent to the radius or ulna. The surgical(More)
Interpretation of computed tomographic and magnetic resonance arthrograms of the shoulder is complicated by normal variants of the labrum and glenohumeral ligaments. A superior sublabral recess is located at the 12 o'clock position and represents a normal recess between the superior labrum and the cartilage of the glenoid cavity. A sublabral foramen is(More)
OBJECTIVE The objective of this study was to assess the ability of sonography to reveal Baker's cysts using MR imaging as a gold standard. MATERIALS AND METHODS The study group consisted of 36 consecutive knees in 36 patients evaluated with both MR imaging and sonography. Inclusion criteria included axial proton density-weighted or T2-weighted MR images,(More)
PURPOSE To define magnetic resonance (MR) imaging findings in patients with the iliotibial band friction syndrome (ITBFS) and to correlate these findings with anatomic features defined at magnetic resonance (MR) arthrography in cadavers. MATERIALS AND METHODS The anatomic relationship of the iliotibial tract (ITT) to the lateral recesses of the knee joint(More)
PURPOSE To retrospectively evaluate the imaging features of os peroneum fractures and associated peroneus longus tendon injuries at radiography and ultrasonography (US) and to retrospectively compare these imaging features with those of multipartite os peroneum. MATERIALS AND METHODS Institutional review board approval was obtained and informed consent(More)
OBJECTIVE The purpose of our study was to determine which wrist fractures are not prospectively diagnosed at radiography using CT as a gold standard and to identify specific fracture patterns. MATERIALS AND METHODS Through a search of radiology records from January 1 to December 31, 2005, 103 consecutive patients were identified as having radiographic and(More)
OBJECTIVE The purpose of this investigation was to characterize the MRI appearance of the quadriceps fat pad and to correlate the findings with other knee abnormalities, anatomic measurements of the extensor mechanism, and findings from history and at physical examination. MATERIALS AND METHODS Ninety-two consecutive knee MRI examinations from 84 patients(More)
OBJECTIVE The purpose of this article is to describe the role of advanced imaging using ultrasound, CT, and MRI in the assessment and diagnosis of gout. CONCLUSION Dual-energy CT can quantitatively identify monosodium urate crystal deposits with high sensitivity and specificity within joints, tendons, and periarticular soft tissues. There are several(More)