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STUDY DESIGN Clinical review of pediatric patients with lumbar spondylolysis and biomechanical analysis using finite-element lumbar spine model. OBJECTIVES To evaluate the usefulness of the signal changes observed on MR images of the pedicle for the early diagnosis of spondylolysis, and to investigate the pathomechanism of the signal changes based on the(More)
STUDY DESIGN To determine the effect of cage/spacer stiffness on the stresses in the bone graft and cage subsidence. OBJECTIVE To investigate the effect of cage stiffness on the biomechanics of the fused segment in the lumbar region using finite element analysis. SUMMARY OF BACKGROUND DATA There are a wide variety of cage/spacer designs available for(More)
Associated fractures of the distal ulnar metaphysis were present in 19 of 320 distal radial fractures requiring either closed manipulation or surgical treatment over a 2-year period. Four morphological patterns of ulnar fracture were encountered, the commonest being the type 1 simple extra-articular fracture of the distal end of ulna with minimal(More)
BACKGROUND Studies delineating the adjacent level effect of single level disc replacement systems have been reported in literature. The aim of this study was to compare the adjacent level biomechanics of bi-level disc replacement, bi-level fusion and a construct having adjoining level disc replacement and fusion system. METHODS In total, biomechanics of(More)
STUDY DESIGN/SETTING Retrospective review of clinical outcomes after anterior cervical discectomy and fusion (ACDF) surgery with allograft and plating in patients over 55 years of age. OBJECTIVE To evaluate the results of ACDF surgery in patients aged 55 years and older. SUMMARY OF BACKGROUND DATA ACDF surgery has been a standard treatment for cervical(More)
Percutaneous pinning, which has been recommended for unstable, unimpacted two-part fractures of the proximal humerus, requires satisfactory closed reduction and maintenance of reduction with minimum arm movement. Most surgeons usually keep the image intensifier in the anteroposterior (AP) plane and rotate the arm to obtain a second view. This arm movement(More)
STUDY DESIGN The authors measured the thickness and quality of occipital bone regions to determine screw placement during occipitocervical fusion and described the projection of the posterior dural venous sinuses. OBJECTIVE This study provides anatomic data relevant to areas of screw placement into the occiput during occipitocervical fixation. SUMMARY(More)
Computed tomographic (CT) coronal images of the posterior talocalcaneal joint were compared with lateral radiographic views and intraoperative findings in 35 patients with 36 intra-articular calcaneal fractures. The severity of articular incongruity and rotational displacement of the posterior facet fragment were not well appreciated in coronal CT images of(More)
STUDY DESIGN Biomechanical study using finite element model (FEM) of lumbar spine. OBJECTIVES Very high coincidence of spina bifida occulta (SBO) has been reported more than in 60% of lumbar spondylolysis. The altered biomechanics due to SBO is one considerable factor for this coincidence. Thus, in this study, the biomechanical changes in the lumbar spine(More)