No abstract available.
Inflammation*

An experimental study of the tensile bonding strength of acrylic bone cement was carried out by using the tubular bones of 12 mongolian dogs. Following observations were made: 1. The later the cementing stage, the weaker was the tensile bonding strength of bone cement. 2. When saline or synovial fluid was interposed between the contact surfaces of the recipient bone and the cement, the tensile bonding strength of bone cement decreased by more than 50% of that when the bonding surface was dry. 3. When the bonded bone was stored in Hartmans solution, the tensile bonding strength of bone cement was reduced to 15–25% of the strength when stored in air.
Animals ; Dogs ; Polymethyl Methacrylate ; Synovial Fluid

The origin of the popliteal cyst is the popliteal bursa and frequently combined with the intraarticular lesion. And open excision has been commonly used as a treatment. The authors reviewed 39 cases of popliteal cyst in 38 patients, mangaged with arthroscopic method at Department of Orthopedic Surgery, College of Medicine, Korea University Hospital from June 1989 to July 1993 and the following results were obtained. l. Among 39 cases, 35 cases(89.7%) were associated with intraarticular lesions of the knee joint; 25 cases(71.4%) were chondral injuries, 6 cases(17.1%) were meniscus tear, 2 cases(5.7%) were rheumatoid arthritis and 2 cases were plica syndrome. 2. 20 cases(51.2%) were shown to have the communication between cyst and joint. 3. During operation, position change of the patient and another draping was not necessary. And the blue stained wall enabled authors to remove more completely the popliteal cyst than other conventional operative procedures. 4. Becuase of the short skin incision, the operation time was saved and we were able to recommend early excercise of the knee joint and ambulation. The operative treatment of popliteal cyst with the arthroscopy is the one staged method to excise the cyst and to intervent the combined intraarticular pathology which develop the cyst, and is one of the recommendable method bacause of small skin incision, short hospitalization and early rehabilitation.
Arthritis, Rheumatoid ; Arthroscopy ; Hospitalization ; Humans ; Joints ; Knee Joint ; Korea ; Methods ; Orthopedics ; Pathology ; Popliteal Cyst ; Rehabilitation ; Skin ; Surgical Procedures, Operative ; Tears ; Walking

One of the primary functions for which bones have evolved is to act as a structural support. To achieve this, bones remodel throughout life so that their structure remains optimal for the prevailing mechanical environment. Bone remodeling consists of an initial phase of osteoclastic bone resorption followed by a bone formation period. Prostaglandins are potent regulators of bone formation and bone resorption that can have both stimulatory and inhibitory effects. Elevation of intracellular cAMP is an important intracellular signaling mechanism involved in the regulation of the expression of many proteins. In this study we examine whether PGE or DBcAMP affects osteoblastic activation or osteoclastic differentiation in mouse bone marrow cells and osteosarcoma ROS 17/2.8 cells. The effect of PGE and DBcAMP on the cell proliferation was measured by the incorporation of [3H]- thymidine into DNA. As a result, PGE2 (0.5-1 ug/ml) and DBcAMP (0.1-0.5 mM) inhibited the [3H]-thymidine incorporation into DNA in a dose dependent manner. The effect of PGE2 and DBcAMP on the induction of alkaline phosphatase (ALP) was investigated in ROS 17/2.8 cells cultured in medium containing 0.4% fetal bovine serum. PGE and DBcAMP stimulated ALP activity in the cells in a dose- dependent manner. PGE2 also increased the intracellular cAMP content in a dose- dependent fashion with a maximal effect at 0.5 ug/ml. ROS 17/2.8 cells release nitric oxide upon stimulation of PGE2 or DBcAMP with interferon-r. PGE2 and DBcAMP increase the phosphorylation level of CREB (cAMP response element binding protein) without any change on the amount of CREB protein. Also, PGE (10-6 M) and DBcAMP (10-4 M) significantly increase the generation of osteoclasts in mouse bone marrow cell culture system. In conclusion, the results of this study suggested that cAMP appears to be an important regulatory molecule in the processes of bone formation and resorption.
Alkaline Phosphatase ; Animals ; Bone Marrow Cells ; Bone Remodeling ; Bone Resorption ; Bucladesine* ; Cell Proliferation ; Cyclic AMP Response Element-Binding Protein ; Dinoprostone* ; DNA ; Metabolism* ; Mice ; Nitric Oxide ; Osteoblasts ; Osteoclasts ; Osteogenesis ; Osteosarcoma ; Phosphorylation ; Prostaglandins ; Prostaglandins E ; Response Elements ; Thymidine

No abstract available.
Retreatment* ; Treatment Failure*

STUDY DESIGN: The authors analysed the recovery of clinical symptoms after percutaneous drainage and irrigation in pyogenic vertebral osteomyelitis. OBJECTIVES: To determine the role of percutaneous drainage and irrigation in pyogenic vertebral osteomyelitis. SUMMARY OF LITERATURE REVIEW: Pyogenic vertebral osteomyelitis is a relatively rare condition but its incidence is recently increasing due to common use of intravenous access devices and resultant nosocomial bacteremia. Management of the disease is not uniform and is controversial regarding the role of surgery and duration of use of antibiotics. At present, the role of percutaneous drainage of involved spines in treatment of pyogenic vertebral osteomyelitis is not well-known. MATERIALS AND METHODS: We report 3 cases of pyogenic vertebral osteomyelitis which were treated by continuous drainage with automated percutaneous lumbar discectomy device(APLD device) and draining tube after they haute failed to conservative treatment. APLD device, fluoroscopic guide, contrast media and continuous percutaneous draining tubes were used for this procedure. The percutaneous draining tubes were maintained for 7 to 11 days and each case was followed up for 6 to 10 weeks under admission. RESULTS: Symptoms were relieved 3 to 5 weeks after this procedure. The patients were followed up to 12 to 39 months and experienced no recurrence. CONCLUSIONS: Percutaneous drainage and irrigation with APLD device brought prompt and marked clinical recovery. It is indicated as a supplementary method to conservative treatment or in case of high operative risk patient due to poor general conditions. It has minimal invasiveness, short clinical course and low recurrence rate.
Anti-Bacterial Agents ; Bacteremia ; Contrast Media ; Diskectomy ; Drainage* ; Humans ; Incidence ; Osteomyelitis* ; Recurrence ; Spine

STUDY DESIGN: The indications of the lumbosacral spinal fusion has been very controversial. The posterior lumbar interbody fusion has the popularity of the spinal fusion: coaption of large surface areas of cancellous bone without shear forces, anatomic restoration and maintenance of more normal dimensions of the joint space, total discectomy as preparation for the fusion, and the accomplishment of better neural decompression without creating instability of the spine. OBJECTIVES: To evaluate the long-term results of the surgical management of degenerative lumbar disease by the modified transdiscal posterior lumbar interbody fusion technique using cancellous chip graft were analyzed. SUMMARY OF LITERATURE REVIEW: The disadvantages of classical posterior lumbar interbody fusion has a injury of nerve root by extensive retraction with the insertion of peg grafts into the disc space, compression of root by graft retropulsion, inadeguate removal of annulus fibrosus and end plates from excessive bleeding from venous plexus of spinal canal and from vertebral cancellous bone. MATERIALS & METHOD: Author's 43 cases who had transpedicular instrumentation and modified transdiscal PLIF using cancellous chip graft since 1989 in the Department of Orthopedic Surgery, Korea University Hospital were analyzed, retrospectively. After preparation of the interspace has been complete by total discectomy, removal of the cartilaginous end plates and perforation of the cortical plates using the ring curette, cancellous chip grafts are inserted into the interspace with the Funnel technique. The structural success of each fusion was documented by sequencial radiographs. The criteria for fusion included: homogenous amalgamation of the fusion mass and vertebral bodies, trabeculation, mass configuration, and no motion demonstrable by hyperflexion studies. The results obtained were as follows: 1. Stable fusion was obtained in 39 patients(91%) at post-operative 6 months. 2. Clinically no patient developed neurologic deficit after fusion and 41 patients (95.3%) had good results by Gill's criteria. 3. No significant complications influencing operative result were observed except minor complications such as paralytic ileus, transient dysuria and superficial infection. 4. In conclusion, modified transdiscal PLIF procedure using cancellous chip graft showed excellent clinical and radiological results to achieve spinal fusion and the procedure is technically feasible and should be considered more widely employed.
Decompression ; Diskectomy ; Dysuria ; Hemorrhage ; Humans ; Intestinal Pseudo-Obstruction ; Joints ; Korea ; Neurologic Manifestations ; Orthopedics ; Retrospective Studies ; Spinal Canal ; Spinal Fusion ; Spine ; Transplants*

BACKGROUND: This study was aimed at defining the varying responses of porcine coronary artery(PCA) to various wavelengths of ultraviolet irradiation, and at relating them to the changes in cyclic GMP contents. METHODS: The ring preparations of PCA with intact or removed endothelium were irradiated with the ultraviolet or visible light of wavelengths(240-520mm) from xenon lamp of a spectrofluorometer, and the changes in vascular tension were recorder on polygraph. For cyclic GMP assay, rat thoracic aorta was frozen after irradiation and homogenated. The supernatant was extracted with water-saturated ether and the cyclic GMP contents were measured with radioimmunoassay. RESULTS: Ultraviolet irradiation relaxed the preparations(UVR-relaxation) in resting state and those precontracted by prostaglandin F2alpha, the maximal relaxation occurring at 410nm, and the magnitude depending on the duration of irradiation. The UVR-relaxation was not affected by removing the endothelium, while it was markedly potentiated by pretreatment with Bay K 8644. The Bay K 8644-induced potentiation of UVR-relaxation was abolished by hemoglobin and slightly reduced by wrapping the rings with aluminum foil. Cyclic GMP contents in the increase was markedly potentiated by pretreatment with Bay K 8644. CONCLUSION: The observations suggest that UVR-relaxation in procine coronary artery is caused by activating the nitric oxide-cyclic GMP system, which is most sensitively activated by UVR of 410nm and that its potentiation induced by Bay K 8644 may be related nitrous substance released from the agent upon UVR.
3-Pyridinecarboxylic acid, 1,4-dihydro-2,6-dimethyl-5-nitro-4-(2-(trifluoromethyl)phenyl)-, Methyl ester* ; Aluminum ; Animals ; Aorta, Thoracic ; Bays* ; Coronary Vessels* ; Cyclic GMP ; Dinoprost ; Endothelium ; Ether ; Light* ; Passive Cutaneous Anaphylaxis ; Radioimmunoassay ; Rats ; Relaxation* ; Ultraviolet Rays ; Vasodilation ; Xenon

Recently, various implant cylinders were supplied, especially received gold cylinders, cast cylinders produced from premade gold and plastic cylinders and plastic cylinders. This study measured and compared precise fit produced when using conventional gold and plastic cylinders. The comparative fit of lapped and non-lapped castings made from plastic pattern was examined. The implant/abutment interface fit was evaluated by scanning electron microscopy(SEM) for each of four cylinders. The following results were obtained: 1. The case of plastic cylinder showed 9.67+/-1.50micrometer gap Steri-Oss fixture was connected. 2. The case oflapped casting made from plastic cylinder showed 3.01+/-2.81micrometer gap when Steri-Oss fixture was connected. 3. The case of gold/plastic cylinder showed 9.80+/-1.68micrometer gap when Steri-Oss fixture was connected. 4. The case of gold cylinder showed 5.47+/-2.43micrometer gap when Steri-Oss fixture was connected. 5. In case of each cylinder which was connected with Steri-Oss fixture, the size of gap was showed less in the order of the case of gold/plastic cylinder, the case of plastic cylinder, the case of gold cylinder and the case of lapped casting made from plastic cylinder. As results of this study, the use of premade gold cylinder offers an advantage over plastic patterns in precise fit. When plastic patterns are used, polishing of implant cylinder components should provide precise fit.
Plastics* ; Prostheses and Implants*

No abstract available.
Child* ; Humans