Using Double-Contrast CT Arthrography to Confirm Suspected Dissociation of a Cemented Polyethylene Liner in the Setting of Revision Total Hip Arthroplasty: A Case Report.

Case: A 67-year-old woman who underwent a re-revision of a total hip arthroplasty with a cemented polyethylene liner fell 14 months after surgery. The patient had symptoms of pain and weakness; however, clinical, laboratory, and radiographic evaluation did not disclose fracture, infection, osteolysis, or component migration. Liner dissociation was suspected, and a double-contrast computed tomography (CT) arthrogram confirmed failure at the cement-liner interface.

CT-guided iliosacral screw placement.

Computed tomography (CT)-guided iliosacral screw placement for posttraumatic instability of that joint is a safe procedure that may be performed in a radiology department. CT guidance allows more accurate screw placement than traditional fluoroscopic imaging in the operating room. This article describes the technique for placing cannulated surgical screws percutaneously across the iliosacral joint in patients with unstable pelvic fractures using CT for guidance.

Results of a computed tomography protocol evaluating distal third tibial shaft fractures to assess noncontiguous malleolar fractures.

Background: Intra-articular tibia fractures are reported to occur in 1% to 25% of tibia diaphyseal fractures. The objective of this study was to create a standard protocol to evaluate noncontiguous malleolar fractures associated with distal third tibial diaphyseal fractures using computed tomography (CT).

Methods: Sixty-six patients with 67 distal third tibia fractures were treated at a level one trauma center from December 2005 to November 2007.

Defining the relationship between rotator cuff injury and proximal humerus fractures.

The purpose of our study was to correlate radiographic characteristics with rotator cuff tendon injury on magnetic resonance imaging after fractures of the proximal humerus. We prospectively obtained magnetic resonance imaging on 30 patients with proximal humerus fractures after classifying each fracture radiographically using Neer and AO systems and determining the displacement of the greater tuberosity. Twelve patients (40.

CT-guided iliosacral screw placement: technique and clinical experience.

Objective: The purpose of this study was to describe the technique of and experience in using CT guidance for percutaneous iliosacral screw placement in patients with unstable pelvic fractures.

Conclusion: CT-guided iliosacral screw placement is a safe and accurate procedure that can be performed by radiologists in a radiology suite.

Knee injury in patients experiencing a high-energy traumatic ipsilateral hip dislocation.

Background: Traumatic hip dislocation results from the dissipation of a large amount of energy about the hip joint. Clinically, these forces often are first transmitted through the knee en route to the hip. It is therefore logical to look for coexistent ipsilateral knee injury in patients with a traumatic hip dislocation.

Fatigue fracture of the sacrum in an adolescent.

There are relatively few reports of sacral stress fractures in children. In adolescents, sacral stress fractures have been reported in patients involved in vigorous athletic activity. Recognition of these fractures is important to avoid unnecessary biopsy if the findings are confused with tumor or infection.

Correlation of joint fluid and internal derangement on knee MRI.

Objective: To test the hypothesis that in symptomatic patients, knees in which MRI examinations demonstrate no significant effusion will also be free of internal derangement.

Design And Patients: One hundred and fifteen knee MRI examinations performed between March 2002 and June 2002 at our institution were retrospectively reviewed, evaluating for both the presence of knee effusions and concurrent internal derangement. The amount of joint fluid was measured quantitatively by obtaining anteroposterior measurements in the midline and lateral aspects of the suprapatellar pouch using sagittal MR images.

MRI of tibialis anterior tendon rupture.

Ruptures of the tibialis anterior tendon are rare. We present the clinical histories and MRI findings of three recent male patients with tibialis anterior tendon rupture aged 58-67 years, all of whom presented with pain over the dorsum of the ankle. Two of the three patients presented with complete rupture showing discontinuity of the tendon, thickening of the retracted portion of the tendon, and excess fluid in the tendon sheath.