Peter T. Simonian

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Closed manipulative reduction and percutaneous fixation of a displaced sacral fracture is a treatment alternative that offers several advantages. The fracture is reduced and stabilized without an extensile surgical exposure. The risks of surgical wound problems, especially infection, are lessened. Operative and anesthesia times are decreased by using(More)
The operative management of pelvic ring fractures and dislocations is difficult. Posterior pelvic ring disruptions are often associated with severe soft-tissue injuries and high infection rates. Percutaneous iliosacral screw fixation of the posterior pelvis has become popular with improved fluoroscopic imaging techniques. The percutaneous iliosacral screw(More)
OBJECTIVE To report on the early complications related to the percutaneous placement of iliosacral screws for the operative treatment of displaced posterior pelvic ring disruptions. STUDY DESIGN Prospective, consecutive. SETTING Level-one trauma center. PATIENTS One hundred seventy-seven consecutive patients with unstable pelvic ring fractures. One(More)
Malpositioning of iliosacral screws happens more often when common variations in the morphology of the upper sacral segments are unrecognized. Radiological-anatomic correlations of sacral anatomy were studied in 10 fresh-frozen cadaveric pelvises without evidence of skeletal disease, obtained from six male and four female donors. Eighty consecutive patients(More)
Four cases of subcutaneous pretibial ganglion, with direct communication to the tibial tunnel after autologous reconstruction of the anterior cruciate ligament (ACL) with hamstrings or iliotibial band, are reported. Tibial graft fixation was with a staple in three cases, and with a screw and soft tissue washer in one. The average time to ganglion(More)
The purpose of this study was to evaluate pubic ramus fracture fixation. This biomechanical evaluation compared standard plating techniques with retrograde medullary screw fixation of a superior pubic ramus fracture in a pelvic fracture model. Six fresh-frozen, cadaveric pelvic specimens with a mean age of 79 years were harvested. These specimens were(More)
Retrograde medullary screws were used in 26 patients with unstable pelvic ring injuries to stabilize the superior public ramus fractures. The posterior pelvic ring fractures and dislocations were fixed with iliosacral screws. The retrograde screws were inserted after closed manipulative reductions of the superior pubic ramus fractures in 15 patients and(More)
The purpose of this study was to document the effect of muscle fatigue on glenohumeral kinematics. Twelve male volunteers without shoulder disease and with an average age of 27 years were studied. Glenohumeral anteroposterior radiographs were taken at 45 degrees intervals as the arm was abducted in the plane of the scapula from 0 degree to 135 degrees. This(More)
Fifty-seven consecutive patients (58 knees) with an acute, isolated, posterior cruciate ligament (PCL) injury were treated nonoperatively. Clinical, radiographic, and functional assessment was performed at a mean follow-up of 6.9 years (range 2 to 19.3 years) after the initial diagnosis. At the time of initial documentation of the injury, the posterior(More)
We treated 17 knees in 15 patients with severe ligament derangement and dislocation by open repair and reconstruction. We assessed the competence of all structures thought to be important for stability by clinical examination, MRI interpretation, and surgery. Our findings showed that in these polytrauma patients clinical examination was not an accurate(More)