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[en] The Grassmannian representation for gauge-invariant amplitudes for arbitrary number of legs with one of them being off-shell is derived for the case of N = 4 SYM. The obtained formula are successfully checked against known BCFW results for MHVn, NMHV4 and NMHV5 amplitudes.
[en] Sixteen patients suspected of having meniscal lesions, were examined bt magnetic resonance (MR) and arthroscopy, MR and arthroscopy corelate well for meniscal and cruciate ligament lesions. Damage of the articular cartilage was, however, not detected by MR (author). 15 refs.; 4 figs.; 1 tab
[en] Forty two cases of L-C-P disease which visited Chonnam University Hospital during the past 4 years and 8 months from January 1974 to August 1978 were radiologically evaluated. The results were as follows; 1. Sex incidence revealed male predominance with male to female ratio about 6 : 1. 2. The distribution of affect side showed 59.5% in right, 38.1% in left, 2.4% in both. 3. Six to nine years old group was most commonly affected (15 cases, 35.7%), and 30 cases (71.4%) were in 3 to 15 years old group. 4. When visiting hospital, the stage of disease was most commonly noted in avascular stage (22 cases), and the duration of disease was most common below 4 months (22 cases). 5. T.D.D. was measured in 42 cases irrelevalent to stage of disease, and ranged about 5-12 mm in normal hip joints, and there was largely about 2 mm wider then normal ones in affected hip joint.
[en] The hypothesis of this study was that length, torsion, and axis of a leg phantom can be measured accurately and reproducibly by magnetic resonance imaging (MRI) and that this can be applied to patients with leg deformities. Two phantoms and 30 patients (genu varum, n=15; genu valgum, n=15) were investigated using an optimized MRI technique. Reference measurements were performed with a micrometer screw and a goniometer. Patient leg length and axis were compared with long radiographs in bipedal stance. Intra- and interobserver reproducibility and accuracy were calculated using the mean absolute difference (MAD) and the 95% confidence interval. In patients, comparisons were done using a paired Student's t-test. MAD, intraobserver MAD, and interobserver MAD were 0.03, 0.03, 0.04 mm (length); 0.98, 1.2, 0.98 (torsion); and 0.18, 0.23, 0.22 (axis), respectively. In patients, leg length was underestimated by MRI (-2.4 ± 0.7%; 1.9±0.7 cm; P<0.001). The hip-knee-ankle angle (HKA) did not show significant differences in varus knees (-0.5 ± 1.0 ; P>0.05), while it was significantly underestimated in valgus knees (-3.6 ± 2.8 ; P<0.05). The phantom study revealed that leg length, torsion, and axis can be measured accurately and reproducibly by MRI. Although underestimation of leg length and HKA in valgus knees occurred, this optimized MRI technique can be applied to patients with leg deformities. (orig.)
[en] Femoral arteriography has assumed in recent years a greater clinical and surgical significance, especially since the advent of arterial grafting for occlusive arterial disease. Evaluation of the site and extent of occlusion, the state of distal arterial tree and degree of collateral circulation can best be obtained by serialographic studies. Authors analyzed 28 cases of clinically and radiologically diagnosed Buerger's disease in GURO hospital radiology, College of medicine, Korea University, during last 6 months from March to August 1984. The result are as follows; 1. The age distribution were between 20 and 50 years old, and most commonly involved age group was 20-29. 2. The most frequent finding was the obstruction of peripheral artery with or without collateral vessel and almost all patient had occlusion more than 1 segmental branch. 3. The most frequently involved arteries in Buerger's disease were trifurcation area below the knee joint, anterior and posterior tibial artery and peroneal artery. Peroneal artery was less commonly involved than anterior or posterior tibial artery
[en] Calcific myonecrosis is a rare and latent condition of the lower extremities after a trauma and is characterized by the formation of a fusiform mass lesion in the anterior compartment of the leg showing peripheral dystrophic calcification and central liquefaction. We report the radiologic findings of calcific myonecrosis in a patient with a lower extremity calcified mass lesion
[en] The intermittent pneumatic compression (IPC) therapy has been used in post-traumatic rehabilitation of fractures of crusis, and it has reduced the oedema as measured immediately after the treatment. The purpose of the present study was to assess the amount of oedema, and its distribution with CT in lower leg fracture patients before and after IPC treatment (author). 6 refs. 2 tabs
[en] The results of the electrical impedance method, for determining the increase of extracellular fluid area in edematous legs, and CT are compared in evaluating the degree of edema of extremities. (H.W.). 4 refs
[en] Snapping hip syndrome has been described as a hip pain accompanied by an audible snapping during motion of the hip or while walking. The variable causes of its external, internal, and intra-articular origins have been described. The most common extemal snapping hip has been associated with a thickened posterior border of the iliotibial band or of the anterior border of the gluteus maximus muscle slipping over the greater trochanter. The aim of this study was to evaluate the dynamic ultrasound findings of external snapping hip syndrome with review of the literature. We studied 5 patients (7 cases) with external snapping hip and pain over the greater trochanter during walking or hip motion (3 males and 2 females, age range, 14-32 years; mean, 19 years). Two patients reported bilateral snapping hips.