In 1971, for purpose of reduction of peak stress occuring in cement and trabecular bone of the acetabulum, Harris reported a series of metal-backed acetabular components with removable polyethylene liners that could be replaced if excessive wear occured. Modular designs of hip prostheses have become popular recently, but they introduce the risk of disassembly of the components postoperatively. And introduce of loosening and infection of femoral or acetabular components by debris of polyethylene liner. We report a case of mechanical disassembly of polyethylene liner in cementless metal backed cup, and review previously reported articles.
Acetabulum ; Hip Prosthesis ; Polyethylene

No abstract available.
Laurence-Moon Syndrome*

No abstract available.
Laurence-Moon Syndrome*

No abstract available.
HL-60 Cells* ; Humans ; Mass Screening* ; Protein Kinases*

No abstract available.
Axis, Cervical Vertebra* ; Spondylolysis*

No abstract available.
Joints*

Cysticercosis is due to a larva of Taenia Solium. It is frequently reported in developing countries. It usually affects subcutaneous tissue, muscles and brain. But, spinal cysticercosis is rare and is usually diagnosed at surgery. Authors experienced a case of spinal cysticercosis accompanied with spondylolistheses at the same level. Space occupying lesion and arachnoiditis, confirmed by MMCT and MRI, were noted at the same level of spondylolistheses. So, it was very hard to make dicision whether we should open up the dura or not.
Arachnoid ; Arachnoiditis ; Brain ; Cysticercosis ; Developing Countries ; Larva ; Magnetic Resonance Imaging ; Muscles ; Spondylolisthesis ; Subcutaneous Tissue ; Taenia solium

We Studied 48 patients(62 hips) who were performed hip arthroplasties at the Department of Orthopaedic Surgery, Soonchunhyang University hospital from February 1990 to August 1992. The purpose of the present study was to compare canal filling ratio and clinical results of cases treated by cementless femoral stem with 19 Harris Galante(straight stem), 23 Anatomic(curved stem) and 20 Multilock (straight stem). The follow-up periods ranged from 12 months to 36 months. We assessed canal filling at metaphysis, mid-stem and distal canal, and clinical results according to canal filling. The results were as follows ; 1. The average filling ratio of the medullary canal by each type of stem in the coronal plane were as follows. Harris Galante ; 80. 5%, Anatomic ; 79. 4%, Multilock; 79. 8% in metaphysis. Harris Galante ; 88. 7%, Anatomic ; 88. 3%, Multilock ; 87. 3% in mid-stem. Harris Galante ; 95. 1%, Anatomic 90. 2%, Multilock ; 94. 5% in distal canal. At distal canal, the average canal filling of Harris Galante and Multilock were more excellent than Anatomic in coronal plane. 2. The average filling ratio of the medullary canal by each type of stem in the saggital plane were as follows. Harris Galante ; 64. 0%, Anatomic 69. 6%, Multilock ; 68. 6% in metaphysis. Harris Galante ; 79. 6%, Anatomic; 84. 5%, Multilock; 80. 2 in mid-stem. Harris Galante ; 78. 3%, Anatomic ; 82. 6%, Multilock ; 84. 5% in distal canal. At mid-stem, the average canal filling of Anatomic was more excellent than Multilock and Harris Galante. At metaphysis and distal canal, the average canal filling of Anatomic and Multilock were more excellent than Harris Galante in saggital plane. 3. The average Harris's hip scores of each type of stem at the final follow-up was 89. 9 in Harris Galante, 90. 3 in Anatomic and 91. 9 points in Multilock. There was no significance statistically(p>0.05). 4. The correlation between the average canal filling and thigh pain was not statistically significant (p>0. 05).
Arthroplasty ; Follow-Up Studies ; Hip ; Thigh

Mach bands, a visual phenomenon resulting from lateral inhibitory impulsess in the retina, are recognized aslucent or dense lines at the borders of different radiographic densities. A number of clinical situations have been described in which Mach bands may cause difficulty in radiographic diagnosis. Photodensitometric measurement of the film can differentiate the true change in film density from the Mach band which is an optical illusion. Authors present several examples of photodensitometric tracings of Mach bands, with the brief review of themechanism of their production.
Diagnosis ; Optical Illusions ; Retina

BACKGROUND/AIMS: Precore and core promoter mutations of hepatitis B virus (HBV) have been reported in Korea but their prevalence and clinical significance have not been determined. The aims of this study were to determine the prevalence of precore and core promoter mutations and their relationships to hepatitis B e antigen (HBeAg) status, viral replication level, and severity of liver disease in Korea. METHODS: Among the patients who visited the Liver Diseases Clinics (Chung Ang University Hospital) between December 1998 and August 1999, 150 patients were randomly selected: 50 HBeAg-positive HBV-DNA positive patients by a branched DNA (bDNA) assay, 50 HBeAg-negative bDNA-positive patients, and 50 HBeAg-negative bDNA-negative patients. Serum HBV-DNA was amplified by a polymerase chain reaction (PCR) in these patients and the core promoter/precore HBV sequence was determined in 135 of the patients whose sera were positive for HBV-DNA by PCR. RESULTS: All of the 135 determined HBV-DNA sequences had HBV genotype with T at nucleotide 1858. Precore mutation (A1896) was detected in 95.7% of HBeAg-negative bDNA-positive patients and 94.9% of HBeAg-negative bDNA-negative patients. In HBeAg-positive patients 88% had wild type and 12% had mixture of wild type and A1896 mutant. Core promoter TA mutation (T1762/A1764) was detected in 93.5% of HBeAg-negative bDNA-positive patients, 94.9% of HBeAg-negative bDNA-negative patients and 74% of HBeAg-positive patients. No correlation was found between the presence of precore/core promoter mutations and liver disease severity or HBV-DNA levels. CONCLUSION: Precore stop codon mutation occurred almost invariably, along with HBeAg seroconversion, irrespective of subsequent viral replication levels or disease severity. Core promoter TA mutation was frequent both in the HBeAg-positive patients and HBeAg-negative patients irrespective of viral replication levels or disease severity.
Adolescent ; Adult ; Aged ; DNA, Viral/analysis ; English Abstract ; Female ; Hepatitis B Virus/*genetics ; Hepatitis B e Antigens/analysis ; Hepatitis B, Chronic/*virology ; Human ; Korea ; Male ; Middle Aged ; *Mutation ; Promoter Regions (Genetics)/*genetics ; Sequence Analysis, DNA ; Viral Core Proteins/*genetics ; Viral Load