The mechanical stiffness of Unilateral-Ring Hybrid External Fixation(URHEF) was analyzed and compared with conventional Ilizarov circular external fixation system and unilateral fixation with DynaExtor(R). Our URHEF is basically a unilateral external fixation system which affords easier incorporation and removal of the Ilizarov rings(200mm in diameter) coupled with connecting clamps at anytime, if needed. It allows controlled axial micromotion in due time. For mechanical test, URHEF system was constructed using a DynaExtor(R) fixed with two or three half pins(6 mm in diameter) attached with two proximal and distal Ilizarov rings fixed with an olive pin and a half pin on each ring. Unilateral fixation system was constructed with a DynaExtor(R) fixed with 2 or 3 half pins. Ring fixation system was constructed with four Ilizarov rings(140mm in diameter). Ilizarov system were assembled into 90degrees-90degrees and 45degrees-13 5degrees configurations with 2 olive pins, respectively. The distance between the center of pylon and the pin-clamp interface was equalized, being 70mm, in all the systems. Stiffness in axial compression, anteroposterior and lateral bending was measured. On axial compression and lateral bending tests, URHEF was stiffer than DynaExtor(R) and Ilizarov systems. On anteroposterior bending test, URHEF was less stiff than 90degrees-50degrees configuration of the Ilizarov system but stiffer than 45degrees-135degrees configuration. Considering the fact that instead of 90degrees-90degrees transfixing pin fixatin system, 45degrees-135degrees configuration system is generally used in clinical practice, URHEF appears to be significantly stiffer than unilateral(DynaExtor(R)) and circular (Ilizarov)fixation systems. This mechanical study implicates that URHEF can be beneficially applied in the clinical use with assurance of mechanical stability.
External Fixators ; Olea

The purpose of this study is to evaluate biomechanical stability of Korean Ilizarov fixator before clinical application. We measured the ultimate tensile load and stiffness of Ilizarov smooth wire and olive wire, bending stiffness of half-pin, ultimate compressive load and stiffness of Ilizarov ring using Instron 1331. Four types of Ilizarov assembly were tested for measuring stiffness of axial compression, anteroposterior bending, and lateral bending. There were group I fixed with only smooth wires; group II with only olive wires; group III with wires and half-pins; and group IV with only half-pins. The results of Korean Ilizarov apparatus were compared to those of American Ilizarov apparatus using unpaired t-test. The ultimate tensile strength of Korean smooth wire was greater than that of American wire. The ultimate tensile strength of Korean olive wire was lower than that of American wire. There was no significant difference of stiffness of axial compression, anteroposterior bending, and lateral bending between American and Korean apparatus. There was no significant difference of axial compression stiffness and bending stiffness between group III and group IV. In conclusion, Korean Ilizarov apparatus can be used with good stability for treatment of fracture, internal bone transport, and limb lengthening according to this biomechanical study.
Extremities ; Olea ; Tensile Strength

If the intramedullary nail fails for any reason, the broken nail must be removed by a closed or open manner to perform the next procedure for osteosynthesis. Numerous techniques have been introduced but the removal was difficult to do without special equipment. We have successfully removed the distal segment only with the olive tipped and straight guide rod which are ordinary equipment for intramedullary nailing. We found that this is a very simple, safe and economic method for retrieval of the distal fragment of broken femoral and tibial nails.
Femur* ; Fracture Fixation, Intramedullary ; Olea

The current study describes seven species that are new to the lichen mycota of South Korea. A taxonomic description of Arthonia excipienda, A. radiata, Arthothelium ruanum, Enterographa leucolyta, Fissurina elaiocarpa, Rinodina oleae, and Thelotrema porinaceum was given and supported by distribution, ecology, and illustrations. Each species was compared with a species showing close resemblance.
Classification ; Ecology ; Lichens* ; Olea ; Republic of Korea*

This study was undertaken to investigate the optimal conditions for challenge testing with DNCB in 3 vehicles applied to guinea pigs in standardized amount/ area (pg/cm2) The results are sumrnarized as follows: 1) All test reactions were negative when tested in 10 unsensitized animals. 2) There were significant difference in positive rate between 0. 05%, DNCB in alcohol and 0.1% DNCB in alcohol, but there were no significant difference between 0. l%, DNCB in alcohol and 0, 2% DNCB in alcohol. Same results were obtaincd when DNCR was dissolved in acetone. 3) Acetone gives the significantly higher degree of positive reactions, indicating that alcohol may be the safer vehicle in eliciting a response than acetone. 4) With DNCB in olive oil, relatively few animals reacted compared to the results obtained with alcohol and acetone. Furthermore, olive oil is slippery and difficult to utilize when attempting to delineate surface area. 5) With alcohol, we obtained a good correlation between the amount applied and the resulting response, showing that this vehicle might be a superior vehicle in eliciting contact allergy.
Acetone ; Animals ; Dinitrochlorobenzene* ; Guinea Pigs* ; Guinea* ; Hypersensitivity* ; Olea ; Olive Oil

A typical case of collodion baby was reported. On admission, the entire skin surface of this infant was covered with collodion-like membrane with fissures and exfoliations. Flexion contracture of all four extrimities and ectropion of both eyes were also appeared on admission. The family history and laboratory findings were unremarkable. The skin lesions were almost completely healed after application of copious amount of Vit. A cream; Prednisolone ointment and Olive oil for one month. A brief review of literatures were presented.
Collodion* ; Contracture ; Ectropion ; Humans ; Infant ; Membranes ; Olea ; Prednisolone ; Skin

PURPOSE: Wingspan is the only FDA approved self-expanding stent for intracranial artery and known to have better delivery compared to balloon expandable stent. However, some delivery failure has been reported but incidence and mechanism of the failure have not been completely elucidated. We present the cause and mechanism of Wingspan deployment failure experienced in our Institute. MATERIALS AND METHODS: We experienced deployment failure in seven patients (8.8%) out of 80 patients who underwent Wingspan stenting since 2007. Mean age of the patients was 62 (range 47~78) and male to female ratio was 6:1. We evaluated the cause and mechanism why the deployment was not successful and how we could manage it subsequently. RESULTS: We categorized failures occurred in seven patients into three categories: delivery failure (n = 3), deployment failure of stent (n = 3), retrieval failure of dual tapered (olive) tip of the inner body through the deployed the stent (n = 1). The technical failure in using Wingspan stent (delivery, deployment and retrieval failures) are related to tortuousness of the proximal (n =4) as well as distal (n =1) cerebral vessels to the stenotic lesion and bulky profile of the olive tip (n =2). CONCLUSION: The technical failure in using Wingspan stent (delivery, deployment and retrieval failures) are related to tortuousness of the proximal as well as distal cerebral vessels to the stenotic lesion and bulky profile of the olive tip. To avoid device-related complication, complete understanding of the stent design is mandatory before using the stent.
Arteries ; Atherosclerosis ; Female ; Humans ; Incidence ; Male ; Olea ; Stents

Hypertrophic olivary degeneration is usually caused by a lesion in the triangle of Guillain and Mollaret. The inciting pathology includes ischemic, inflammatory, degenerative or, less frequently, traumatic lesions. Clinically, it is usually accompanied by palatal myoclonus or other forms of segmental myoclonus. We present four patients with hypertrophic olivary degeneration studied with MRI after severe head trauma. MRI was performed between 5 and 18 months respectively after trauma. Although post-traumatic tremor was observed in three patients, none of patients showed palatal myoclonus. MRI showed multiple post-traumatic lesions within the dentato-rubro-olivary pathway associated with enlargement and increased signal intensity of the inferior olives.
Craniocerebral Trauma ; Humans ; Magnetic Resonance Imaging ; Myoclonus ; Olea ; Pathology ; Tremor

The purpose of this study was to evaluate clinically and histopathologically the effects to the periodontal tissue in rats after Cyclosporin A(CsA) administration and to determine whether there is a relationship between dosage of CsA or blood CsA level and the severity of gingival overgrowth in rats. Twenty 6-week-old Sprauge-Dawley rats were randomized into 4groups. The control group received olive oil only and the test groups received daily CsA in olive oil via gastric feeding for 6weeks at a 3,10, and 30 mg/Kg. Rats were weighed to evaluate the systemic effect of drug and stone models were made from alginate impressions of upper and lower anterior region at 2-week interval. On completion of oral CsA administration, blood were collected and blood CsA levels were quantitated by TDxFLx analyzer. Rats were sacrificed and their upper and lower jaws were removed together with the surrounding gingiva and soft tissue for light microscopic examination. The results were as follows: 1. The weight gain of CsA-treated rats was much less than of the control group and central incisors were gradually displaced and separated in the test groups. 2. The extensive fibrovascular proliferation and scattered inflammatoy infiltrates in an edematous stroma were observed in enlarged gingiva of CsA-treated rats. 3. The increase in buccolingual, mesiodistal dimension of the anterior teeth and vertical height of the interdental papilla showed dose-dependent manner in CsA-treated rats. 4. Significant positive correlation exists between blood CsA level and the severity of gingival overgrowth in anterior teeth. This result indicates that the severity of gingival enlargement in CsA treated rats is correlated with dosage of CsA administration and blood CsA level.
Animals ; Cyclosporine* ; Gingiva ; Gingival Overgrowth* ; Incisor ; Jaw ; Olea ; Rats* ; Tooth ; Weight Gain ; Olive Oil

PURPOSE: Palatal myoclonus(PM) is an involuntary cyclic movement of the soft palate and is known to be caused by the hypertrophic degeneration of the inferior oilvary nucleus of the medulla, secondary to the dentato-rubro-tegmental tract lesions. Our purpose is to describe the brain magnetic resonance(MR) imaging findings in palatal myoclonus. MATERIALS AND METHODS: We retrospectively analyzed the locations and causes of primary lesions in the dentato-rubro-tegmental tract and correlated them with changes in MR signal intensity and size of the inferior olive on T2-weighted MR images in 10 patients with palatal myoclonus. RESULTS: All cases showed hyperintensity in one or both inferior olive and six cases showed accompaning enlargement. The locations of the primary lesions were dorsal aspect of pons(central tegmental tract) in eight patients and the dentate nucleus in one, and no lesion was found in the dentato-rubro-tegmental tract in one. Among eight patients who had lesions in the ports, the ipsilateral inferior olivary nuclei showed changes in five and bilateral olive were involved in three. In the case with a lesion in the dentate nucleus, the contralateral inferior olivary nucleus was involved. The causes of primary lesions were hemorrhage in eight cases and traumatic brain stem injury in one. CONCLUSION: MR specifically showed enlargement and hyperintensity of the inferior olivary nucleus on T2-weighted images and matching lesions in the ports or the dentate nucleus in patients with palatal myoclonus.
Brain ; Brain Stem ; Cerebellar Nuclei ; Hemorrhage ; Humans ; Myoclonus ; Olea ; Olivary Nucleus ; Palate, Soft ; Retrospective Studies