Skeletal radiology
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To evaluate technical success, complications, and effective dose in patients undergoing CT fluoroscopy-guided iliosacral screw placement for the fixation of unstable posterior pelvic ring injuries. ⋯ CT fluoroscopy-guided screw placement for the treatment of posterior pelvic ring instabilities can be performed with high technical success and a low complication rate. This method provides excellent intrainterventional visualization of iliac and sacral bones, as well as the sacral neuroforamina for precise screw placement by applying an acceptable effective patient dose.
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Late segmental collapse after internal fixation for femoral neck fracture is the phenomenon observed in post-traumatic osteonecrosis of the femoral head (ON), which has generally been reported to occur over a year or more after internal fixation. Subchondral insufficiency fracture of the femoral head (SIF) has also been recognized to cause femoral head collapse, however, only two cases of SIF after internal fixation for femoral neck fracture have been reported. ⋯ Clinically, differentiating SIF from ON is important because some cases of SIF have been reported to heal without surgical treatments. The timing of femoral head collapse after femoral neck fracture may be different between SIF and post-traumatic ON.
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Luxatio erecta or inferior glenohumeral dislocation is a rare type of shoulder dislocation, accounting for less than 1 % of all reported shoulder dislocations. We describe a 15-year-old male who presented with luxatio erecta following an injury to his shoulder that resulted from a mountain biking accident. Clinically, the patient had shoulder pain and fixed abduction of the arm. ⋯ The MR findings were confirmed on arthroscopy. The bone and soft tissue injury pattern seen in our patient clearly supports the described mechanism of injury for luxatio erecta and lends credence to the theory that a fracture of the greater tuberosity spares injury to the rotator cuff, especially in children. A review of the literature failed to reveal any prior description of the MRI or MRA findings of luxatio erecta in a pediatric patient or any publication with arthroscopic confirmation of the MR findings.