Differential Diagnosis of Metatarsalgia.

Lesser (or central) metatarsalgia is defined as pain in the forefoot under or around the lesser metatarsals and their respective metatarsophalangeal joints. Two common causes of central metatarsalgia are Morton's neuroma (MN) and plantar plate (PP) injury. Because both clinical and imaging features overlap, establishing the correct differential diagnosis may be challenging.

Marginal impaction in posterior wall fractures of the acetabulum.

Objective: The purposes of this study were to describe the CT features of isolated posterior acetabular wall fractures with associated marginal impaction and to discuss the potential therapeutic implications of recognizing this type of fracture.

Conclusion: Marginal impaction is an important cause of articular incongruity that adversely affects prognosis. Radiologists should be capable of identifying posterior acetabular wall fracture patterns because they may be the first to suggest diagnoses.

Recurrent anterior glenohumeral instability: the quantification of glenoid bone loss using magnetic resonance imaging.

Objective: To investigate the accuracy of conventional magnetic resonance imaging (MRI) in determining the severity of glenoid bone loss in patients with anterior shoulder dislocation by comparing the results with arthroscopic measurements.

Subjects And Methods: Institutional review board approval and written consent from all patients were obtained. Thirty-six consecutive patients (29 men, seven women; mean age, 34.

Patellofemoral Instability: Evaluation by Magnetic Resonance Imaging.

Objective: To determine the contribution of magnetic resonance imaging (MRI) in evaluating patelofemoral instability.

Methods: 39 patients (45 knees) with patellar instability underwent knee magnetic resonance images between October 2009 and July 2011, at the Rede Lab's D'Or, in the city of Rio de Janeiro, State of Rio de Janeiro, were included. MRI were analyzed for the presence of bone, hyaline cartilage and soft-tissue abnormalities, as well as anatomic variants that may contribute to chronic patellar instability.

Arthrography of the shoulder: a modified ultrasound guided technique of joint injection at the rotator interval.

Objective: To describe an ultrasound guided technique of shoulder joint injection at the rotator interval space, using an endocavitary transducer and performed by a radiologist with no previous experience with arthrography.

Materials And Method: Accuracy of the intra-articular puncture and incidence of complications were evaluated in 180 consecutive patients submitted to joint puncture for shoulder MR arthrography.

Results: Puncture was accomplished successfully in all cases, of which 92% with one attempt, and 8% with two, both well tolerated by patients.