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Background@#To evaluate the demographics, clinical and radiographic features of calcific tendinitis of the shoulder in the Korean population, specifically focusing on the incidence of coexisting rotator cuff tear. @*Methods@#Between October 2014 and January 2015, we performed a prospective multicenter study with 506 patients from 11 training hospitals in Korea. We collected data of demographics and radiographic analysis based on simple radiographs, clinical assessments based on visual analog scale (VAS) and the American Shoulder Elbow Surgeons (ASES) score, and treatment modalities that are used currently. We also evaluated coexisting rotator cuff tear by ultrasonography (US) or magnetic resonance imaging (MRI) images. @*Results@#There were 402 female patients (79%) with mean age of 55 years (range, 31–87 years). Mean duration of symptoms was 16 months. Mean size of calcific materials was 11.4 mm (range, 0–35 mm). Mean value of VAS and ASES scores were 6.5 (range, 1–10) and 47 (range, 8–95), respectively. Of 383 patients (76%), 59 (15%) had rotator cuff tear including 15 full-thickness tears on US or MRI. Patients with rotator cuff tears were significantly associated with older age, recurrent symptoms, menstrual disorders in females, and having undergone calcification removal surgery and rotator cuff repair (all p<0.05). @*Conclusions@#This study reported demographic, radiographic, and clinical features of calcific tendinitis of the shoulder in Korean population, which were not different from those of Western population. Coexisting rotator cuff tear was found with 15% incidence in this large series, suggesting that further radiographic study to evaluate rotator cuff tear might be needed in some calcific tendinitis patients of older age and presenting with recurrent symptoms.
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Background@#To evaluate the demographics, clinical and radiographic features of calcific tendinitis of the shoulder in the Korean population, specifically focusing on the incidence of coexisting rotator cuff tear. @*Methods@#Between October 2014 and January 2015, we performed a prospective multicenter study with 506 patients from 11 training hospitals in Korea. We collected data of demographics and radiographic analysis based on simple radiographs, clinical assessments based on visual analog scale (VAS) and the American Shoulder Elbow Surgeons (ASES) score, and treatment modalities that are used currently. We also evaluated coexisting rotator cuff tear by ultrasonography (US) or magnetic resonance imaging (MRI) images. @*Results@#There were 402 female patients (79%) with mean age of 55 years (range, 31–87 years). Mean duration of symptoms was 16 months. Mean size of calcific materials was 11.4 mm (range, 0–35 mm). Mean value of VAS and ASES scores were 6.5 (range, 1–10) and 47 (range, 8–95), respectively. Of 383 patients (76%), 59 (15%) had rotator cuff tear including 15 full-thickness tears on US or MRI. Patients with rotator cuff tears were significantly associated with older age, recurrent symptoms, menstrual disorders in females, and having undergone calcification removal surgery and rotator cuff repair (all p<0.05). @*Conclusions@#This study reported demographic, radiographic, and clinical features of calcific tendinitis of the shoulder in Korean population, which were not different from those of Western population. Coexisting rotator cuff tear was found with 15% incidence in this large series, suggesting that further radiographic study to evaluate rotator cuff tear might be needed in some calcific tendinitis patients of older age and presenting with recurrent symptoms.
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BACKGROUND: This study aimed to investigate whether fatty infiltration (FI) measured on a single sagittal magnetic resonance imaging (MRI) slice can represent FI of the whole supraspinatus muscle. METHODS: This study retrospectively reviewed the MRIs of 106 patients (age 50–79 years) divided into three rotator cuff tear-size groups: medium, large, and massive. Fat mass and muscle mass on all T1-weighted sagittal MRI scans (FA and MA) were measured. Of the total MRI scans, the Y-view was defined as the most lateral image of the junction of the scapular spine with the scapular body on the oblique sagittal T1-weighted image. Fat mass and muscle mass seen on this Y-view single slice were recorded as F1 and M1, respectively. Fat mass and muscle mass were also assessed on MRI scans lateral and medial to the Y-view. The means of fat mass and muscle mass on these three slices were recorded as F3 and M3, respectively. Average FI ratios (fat mass/muscle mass) of the three assessment methods (F1/M1, FA/MA, and F3/M3) were compared. Intraclass correlation coefficients (ICCs) were calculated for inter- and intraobserver reliability. RESULTS: ICCs showed higher reliability (> 0.8) for all measurements. F1/M1 values were not statistically different from FA/MA and F3/M3 values (p > 0.05), except in males with medium and large tears. F3/M3 and FA/MA were not statistically different. The difference between F1/M1 and FA/MA did not exceed 2%. CONCLUSIONS: A single sagittal MRI slice can represent the whole FI in chronic rotator cuff tears, except in some patient groups. We recommend measurement of FI using a single sagittal MRI slice, given the effort required for repeated measurements.
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Humanos , Masculino , Imagen por Resonancia Magnética , Estudios Retrospectivos , Manguito de los Rotadores , Columna Vertebral , LágrimasRESUMEN
BACKGROUND: To determine the natural progression of conservatively treated rotator cuff tears, we evaluated changes in radiologic and clinical parameters in patients whose recalcitrant tears were neglected after conservative treatment. METHODS: A total of 73 patients with recalcitrant rotator cuff tears in spite of conservative treatment were included in this study. We measured changes in tear size and in the extent of fatty infiltration of the rotator cuff by comparing the initial and final follow-up magnetic resonance imagings (MRIs). To determine factors influencing the change in tear size, we collected the medical history of patients taken at the time of initial admission. RESULTS: The average follow-up period was 20.1 months, and the average increase in tear size across this period was 6.2 mm. In terms of steroid injection, we found that the increases in tear size of the steroid injection group (p=0.049) and of the sub-group that had received more than three steroid injections (p=0.010) were significantly greater than that of the non-steroid injection group. CONCLUSIONS: We found that the increase in cuff tear size was on average 6.2 mm across the follow-up period, indicating that neglecting cuff tears may cause them to progress into more severe tears. We also observed that a history of steroid injection might be a possible risk factor for a worse prognosis of cuff tears. Therefore, we suggest that patients with rotator cuff tears and a history of steroid injection are recommended aggressive modes of treatment such as surgery.
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Humanos , Estudios de Seguimiento , Imagen por Resonancia Magnética , Pronóstico , Estudios Retrospectivos , Factores de Riesgo , Manguito de los Rotadores , LágrimasRESUMEN
BACKGROUND: To determine the natural progression of conservatively treated rotator cuff tears, we evaluated changes in radiologic and clinical parameters in patients whose recalcitrant tears were neglected after conservative treatment. METHODS: A total of 73 patients with recalcitrant rotator cuff tears in spite of conservative treatment were included in this study. We measured changes in tear size and in the extent of fatty infiltration of the rotator cuff by comparing the initial and final follow-up magnetic resonance imagings (MRIs). To determine factors influencing the change in tear size, we collected the medical history of patients taken at the time of initial admission. RESULTS: The average follow-up period was 20.1 months, and the average increase in tear size across this period was 6.2 mm. In terms of steroid injection, we found that the increases in tear size of the steroid injection group (p=0.049) and of the sub-group that had received more than three steroid injections (p=0.010) were significantly greater than that of the non-steroid injection group. CONCLUSIONS: We found that the increase in cuff tear size was on average 6.2 mm across the follow-up period, indicating that neglecting cuff tears may cause them to progress into more severe tears. We also observed that a history of steroid injection might be a possible risk factor for a worse prognosis of cuff tears. Therefore, we suggest that patients with rotator cuff tears and a history of steroid injection are recommended aggressive modes of treatment such as surgery.
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Humanos , Estudios de Seguimiento , Imagen por Resonancia Magnética , Pronóstico , Estudios Retrospectivos , Factores de Riesgo , Manguito de los Rotadores , LágrimasRESUMEN
PURPOSE: The aim of this study is to examine the risk factors of cognitive impairment in elderly hip fracture patients with no underlying neurologic disease, and to determine its effect on functional recovery postoperatively. MATERIALS AND METHODS: From August 2012 to August 2013, 39 patients older than 65 years of age, who underwent hip fracture surgery and were followed-up for a minimum of 1 year at Hallym University Sacred Heart Hospital, were enrolled. All patients were assessed using Korean version of Mini-Mental State Examination (MMSE-K) after admission. All patients were divided into cognitive normal group (MMSE-K> or =24) and cognitive impairment group (MMSE-K<24). WOMAC (Western Ontario and McMaster University) score and Harris hip score were used for assessment of functional recovery at 6-month follow-up. RESULTS: Sixteen patients (41.0%) were classified as the cognitive impairment group. The number of underlying diseases was the only statistically different factor between the two groups. In the evaluation of functional outcome, the functional decline was less in the cognitive normal group. Risk factors for cognitive impairment in elderly hip fracture patients were old age, high body mass index, and the number of underlying diseases, particularly an endocrinologic disease like diabetes. CONCLUSION: Cognitive impairment in elderly patients may have a negative effect on functional recovery after hip fracture surgery. Therefore, we recommend routine evaluation of cognitive function in elderly hip fracture patients even with no underlying neurologic disease.
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Anciano , Humanos , Índice de Masa Corporal , Estudios de Seguimiento , Corazón , Fracturas de Cadera , Cadera , Ontario , Factores de RiesgoRESUMEN
BACKGROUND: There has been lack of epidemiology of proximal humerus fracture using nationwide database in Asia. The purpose of this study was to investigate the incidence of proximal humerus fracture and its mortality following proximal humerus fracture in Korean over 50 years of age. METHODS: The Korean National Health Insurance data were evaluated to determine the incidence and mortality of proximal humerus fracture aged 50 years or older from 2008 through 2012. RESULTS: Proximal humerus fracture increased by 40.5% over 5 year of study. The incidence of fracture increased from 104.7/100,000 in 2008 to 124.7/100,000 in 2012 in women and from 45.3/100,000 in 2008 to 52.0/100,000 in 2012 in men, respectively. One year mortality rate after proximal humerus fracture was 8.0% in 2008 and 7.0% in 2012. One year mortality rate were 10.8% for men and 7.0% for women in 2008 and 8.5% for men and 6.4% for women in 2012. CONCLUSIONS: Our study showed that the proximal humerus fracture in elderly was recently increasing and associated with high mortality in Korea. Considering proximal humerus fracture was associated with an increased risk of associated fractures and an increased mortality risk, public health strategy to prevent the proximal humerus fracture in elderly will be mandatory.
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Anciano , Femenino , Humanos , Masculino , Asia , Epidemiología , Fracturas del Húmero , Húmero , Incidencia , Corea (Geográfico) , Mortalidad , Programas Nacionales de Salud , Fracturas Osteoporóticas , Salud PúblicaRESUMEN
Old post burn contractures on feet still remain challenging problem for reconstructive surgeon. A 43-year-old male visited Hallym University Sacred Heart Hospital with the complain of foot deformity and difficulties in shoe fitting. His right 4th and 5th toes were inverted at dorsal foot. We released the contracture of 4, 5th metatarsophalangeal joint and lengthened extensor tendon by Z-plasty, and covered the resultant defect with the anterolateral thigh flap. The flap was successful and the deformity was corrected. As there have been few reports on reconstruction of foot dorsum, especially on post burn extension contractures in the toes, we report a rare case of contracture release and coverage by free flap.
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Adulto , Humanos , Masculino , Quemaduras , Anomalías Congénitas , Contractura , Pie , Deformidades del Pie , Colgajos Tisulares Libres , Corazón , Articulación Metatarsofalángica , Zapatos , Tendones , Muslo , Dedos del PieRESUMEN
PURPOSE: Most humeral fractures of children are treated satisfactorily with conservative method, thus surgical treatment is often reserved for limited conditions. In cases of an open fracture, inadequate reduction or multiple traumas, children with humeral shaft fractures require operative treatment. The aim of our study was to evaluate results and complications of pediatric humeral shaft fractures that were treated with flexible intramedullary nails. MATERIALS AND METHODS: A retrospective study was performed for 12 patients who were treated operatively by flexible intramedullary nails between March 2009 and September 2011. Surgical indications were an open fracture, an inability to maintain an adequate reduction, concomitant fractures, refractures and combined radial nerve injury. All patients were treated with 2 titanium flexible intramedullary nails by antegrade or retrograde techniques, according to the site of the fractures. RESULTS: The mean follow-up period was 15 months, and all patients achieved union status without major complications. There were no neurovascular injuries or infection during surgical procedures. However, 4 patients showed irritation at the insertion site of the nail, and 2 of them underwent early removal of nails at about 6 weeks due to skin lesions as well as pain and discomfort. One boy showed a fracture next to the proximal insertion site of the antegrade nail. All patients showed a full range of motion, and went back to daily life by the final follow-up. CONCLUSION: Flexible intramedullary nails are considered as a good option for the fracture of the pediatric humeral shaft. Surgeons should pay attention and use proper techniques to avoid complications.
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Niño , Humanos , Estudios de Seguimiento , Fracturas Abiertas , Fracturas del Húmero , Húmero , Traumatismo Múltiple , Uñas , Nervio Radial , Rango del Movimiento Articular , Estudios Retrospectivos , Piel , TitanioRESUMEN
Blood cells are transported into the brain and are thought to participate in neurodegenerative processes following hypoxic ischemic injury. We examined the possibility that transient forebrain ischemia (TFI) causes the blood-brain barrier (BBB) to become permeable to blood cells, possibly via dysfunction and degeneration of endothelial cells in rats. Extravasation of Evans blue and immunoglobulin G (IgG) was observed in the hippocampal CA1-2 areas within 8 h after TFI, and peaked at 48 h. This extravasation was accompanied by loss of tight junction proteins, occludin, and zonula occludens-1, and degeneration of endothelial cells in the CA1-2 areas. Iron overload and mitochondrial free radical production were evident in the microvessel endothelium of the hippocampus before endothelial cell damage occurred. Administration of deferoxamine (DFO), an iron chelator, or Neu2000, an antioxidant, blocked free radical production and endothelial cell degeneration. Our findings suggest that iron overload and iron-mediated free radical production cause loss of tight junction proteins and degeneration of endothelial cells, opening of the BBB after TFI.
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Animales , Masculino , Ratas , Barrera Hematoencefálica/metabolismo , Permeabilidad Capilar , Células Endoteliales/metabolismo , Azul de Evans/metabolismo , Radicales Libres/metabolismo , Hipocampo/metabolismo , Hierro/metabolismo , Ataque Isquémico Transitorio/patología , Proteínas de la Membrana/metabolismo , Ratas Sprague-DawleyRESUMEN
PURPOSE: To describe the surgical treatment of the complex dorsal metacarpophalangeal dislocations and its results, emphasizing on the modified volar approach with A1 pulley release. MATERIALS AND METHODS: We experienced 6 cases of dorsal dislocation of the metacarpophalangeal joint. We performed open reduction with the modified volar approach described by Eaton and Dray. Postoperatively posteroanterior and lateral radiographs of the index finger metacarpophalangeal joint and metacarpophalangeal joint range of motion was followed. RESULTS: One case with a large osteochondral fracture was operated with volar and doral approach both. Overall end results were good without any significant restriction of motion and stability of the fingers. CONCLUSION: Modified volar approach with A1 pulley release is an excellent method for complex dorsal metacarpophalangeal dislocations without osteochondral fracture.
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Benzodiazepinas , Luxaciones Articulares , Dedos , Articulación Metacarpofalángica , Rango del Movimiento ArticularRESUMEN
Myositis ossificans is a solitary benign ossifying lesion in the soft tissue. Occurring predominantly in muscles, a similar lesion may occasionally be found in subcutaneous tissues, tendons, fascia and periosteum. It is often misdiagnosed as an extraskeletal osteosarcoma because of its rapid growth. Therefore, it is sometimes called pseudomalignant myositis ossificans. Myositis ossificans rarely occurs in the distal portion of the finger. We present a case of myositis ossificans of finger and review the the clinical, radiographical, and histological presentation, as well as the appropriate therapeutic management.
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Fascia , Dedos , Músculos , Miositis , Miositis Osificante , Osteosarcoma , Periostio , Tejido Subcutáneo , TendonesRESUMEN
The possibility that P2X7 receptor (P2X7R) expression in microglia would mediate neuronal damage via reactive oxygen species (ROS) production was examined in the APPswe/PS1dE9 mouse model of Alzheimer's disease (AD). P2X7R was predominantly expressed in CD11b-immunopositive microglia from 3 months of age before Abeta plaque formation. In addition, gp91phox, a catalytic subunit of NADPH oxidase, and ethidium fluorescence were detected in P2X7R-positive microglial cells of animals at 6 months of age, indicating that P2X7R-positive microglia could produce ROS. Postsynaptic density 95-positive dendrites showed significant damage in regions positive for P2X7R in the cerebral cortex of 6 month-old mice. Taken together, up-regulation of P2X7R activation and ROS production in microglia are parallel with Abeta increase and correlate with synaptotoxicity in AD.
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Animales , Ratones , Envejecimiento , Enfermedad de Alzheimer/genética , Péptidos beta-Amiloides , Antígeno CD11b/inmunología , Western Blotting , Corteza Cerebral/metabolismo , Modelos Animales de Enfermedad , Expresión Génica , Ratones Transgénicos , Microglía/metabolismo , Neuronas/metabolismo , Placa Amiloide , Especies Reactivas de Oxígeno/metabolismo , Receptores Inmunológicos/análisis , Receptores Purinérgicos P2X7/genéticaRESUMEN
Emergency free flap has been advocated to cover the severely injured extremity for more than two decades, due to its numerous advantages such as low incidence of flap failure and infection rate and early recovery of function. But there are very few reports about these. The authors report their experience in using the emergency free flap for reconstruction of extremities. For last 10 years, 4 patients ranging from 3 to 27 years old with severely traumatized extremities were treated with emergency free flap transfers. Three were males and the other was a female. Flap size ranged from 2x5 cm2 to 7x22 cm2. The locations of the recipient site were the dorsum of the foot, the cubital fossa, the popliteal fossa and the upper arm. The number of the donor sites used was as follows: one scapular flap, two parascapular flaps, and one radial forearm flap with the radial bone. All of the flaps survived without need of re-exploration. There was no infection or flap loss. Involved joints have recovered a normal range of motion. Therefore, we consider that the emergency free flap is a very safe and reliable method to cover the severely injured extremities.
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Femenino , Humanos , Masculino , Brazo , Urgencias Médicas , Extremidades , Pie , Antebrazo , Colgajos Tisulares Libres , Incidencia , Articulaciones , Recuperación de la Función , Valores de Referencia , Donantes de TejidosRESUMEN
Interpostion arthroplasty with allograft has been known as a useful option for the shoulder arthropathy, but it has a limitation to immune response. We performed the pectoralis major muscle transfer for shoulder arthropathy. From January 2007 to December 2007, we performed the pectoralis major muscle transfer in 2 patients. They were 1 man and 1 woman, and the mean age of the patients was 70 years (range, 65 to 75). The average follow-up after surgery was 13 months (range, 12 to 14). We analyzed the clinical results by the American Shoulder and Elbow Surgeons (ASES) Score, and evaluated the pain by Visual Analogue Scale. The level of pain reduced from a preoperative average of 10 to a postoperative average of 1. The ASES scores increased from a preoperative mean of 9 to a postoperative mean of 58. These results indicated that interposition arthroplasty with the pectoralis major muscle transfer is a reliable treatment method for the shoulder arthropathy improving shoulder pain, and patient satisfaction.
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Femenino , Humanos , Artroplastia , Codo , Estudios de Seguimiento , Músculos , Satisfacción del Paciente , Hombro , Dolor de Hombro , Trasplante HomólogoRESUMEN
PURPOSE: Nailbed repair using fine 6-0 or 7-0 absorbable sutures can be technically demanding and time-consuming. We describe a simpler method of nailbed repair using 2-octyl cyanoacrylate (Dermabond(R)) topical adhesive. MATERIALS AND METHODS: Fifteen consecutive patients with nailbed injuries not involving the germinal matrix were repaired with Dermabond(R). There were 7 simple lacerations, 4 stellate lacerations and 4 severe crush injury according to Zook's classification. The appearance of the nail at twelve months was graded according to ridging, splitting, deformity, and sheen of the nail. RESULTS: Nailbed repairs using Dermabond(R) took on average 3.2 minutes to complete. Six patients had excellent aesthetic results, Eight had good results, and one patient with a crush injury had a fair result. There were no complications. CONCLUSION: Dermabond(R) is a useful tool for rapidly repairing acute nailbed injuries. The outcome of repairing injuries not involving the germinal matrix is similar to that expected for suture repairs of similar injuries.
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Humanos , Adhesivos , Anomalías Congénitas , Cianoacrilatos , Laceraciones , Uñas , SuturasRESUMEN
PURPOSE: The purpose of this article is to assess the efficacy of a bioabsorbable polylactide (PLA) plate and screw for treating injuries of ankle fractures. MATERIALS AND METHODS:24 patients who underwent an open reduction and internal fixation operation for ankle fractures from July 2005 to March 2007 were enrolled into the study. There were 15 men and 9 women. The average age of the patients was 44 years and the average follow-up period was 16 years and two months (16.2 months). All cases were divided into low grade fracture patient (11) who belongs in type A and B of Danis-Weber classification and high grade fracture patient (13) who belongs in type C1, C2 of Danis-Weber classification, and each groups were analyzed by clinical (Meyer score) and radiological finding at the time of their last follow-up evaluation. RESULTS:The clinical results according to Meyer scoring system, showed that all patient with low grade fracture had good to excellent result, but only 54% of patient with high grade fracture had good to excellent result. According to Cedell's radiologic finding, there were 91% cases above fair in low grade fracture. But there were 62% of patient above fair result in high grade fracture, the reduction losses were seen in 38% of patient with high grade fracture. CONCLUSION: Bioabsorbable PLA plate and screw is good internal fixation device which doesn't have additional operation for removal of implant because of slow absorption within the human body. It showed sufficient strength for acquisition and maintenance of reduction in low grade fracture, but need attention to use because of many cases of reduction loss in high grade fracture. So, it seems to be safe and effective when used in heeling of low grade fracture under considering about type of fracture sufficiently.
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Animales , Femenino , Humanos , Masculino , Absorción , Tobillo , Estudios de Seguimiento , Talón , Cuerpo Humano , Fijadores Internos , PoliésteresRESUMEN
Previously we demonstrated that ATP released from LPS-activated microglia induced IL-10 expression in a process involving P2 receptors, in an autocrine fashion. Therefore, in the present study we sought to determine which subtype of P2 receptor was responsible for the modulation of IL-10 expression in ATP-stimulated microglia. We found that the patterns of IL-10 production were dose-dependent (1, 10, 100, 1,000 micrometer) and bell-shaped. The concentrations of ATP, ATP-gammaS, ADP, and ADP-beta S that showed maximal IL-10 release were 100, 10, 100, and 100 micrometer respectively. The rank order of agonist potency for IL-10 production was 2'-3'-O-(4-benzoyl)-benzoyl ATP (BzATP) = dATP > 2-methylthio-ADP (2-meSADP). On the other hand, 2-methylthio-ATP (2-meSATP), alpha,beta-methylene ATP (alpha,beta-meATP), UTP, and UDP did not induce the release of IL-10 from microglia. Further, we obtained evidence of crosstalk between P2 receptors, in a situation where intracellular Ca2+ release and/or cAMP-activated PKA were the main contributors to extracellular ATP-(or ADP)-mediated IL-10 expression, and IL-10 production was down- regulated by either MRS2179 (a P2Y1 antagonist) or 5'-AMPS (a P2Y11 antagonist), indicating that both the P2Y1 and P2Y11 receptors are major receptors involved in IL-10 expression. In addition, we found that inhibition of IL-10 production by high concentrations of ATP-gammaS (100 micrometer) was restored by TNP-ATP (an antagonist of the P2X1, P2X3, and P2X4 receptors), and that IL-10 production by 2-meSADP was restored by 2meSAMP (a P2Y12 receptor antagonist) or pertusis toxin (PTX; a Gi protein inhibitor), indicating that the P2X1, P2X3, P2X4 receptor group, or the P2Y12 receptor, negatively modulate the P2Y11 receptor or the P2Y1 receptor, respectively.
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Animales , Ratas , Adenosina Difosfato/análogos & derivados , Adenosina Trifosfato/análogos & derivados , Adenilil Ciclasas/antagonistas & inhibidores , Calcio/metabolismo , Quelantes/farmacología , Proteínas Quinasas Dependientes de AMP Cíclico/antagonistas & inhibidores , Inhibidores Enzimáticos/farmacología , Espacio Extracelular/efectos de los fármacos , Regulación de la Expresión Génica/efectos de los fármacos , Interleucina-10/biosíntesis , Microglía/efectos de los fármacos , ARN Mensajero/genética , Ratas Sprague-Dawley , Receptor Cross-Talk/efectos de los fármacos , Receptores Purinérgicos P2/agonistas , Tionucleótidos/farmacologíaRESUMEN
Recent studies have reported that the "cholinergic anti-inflammatory pathway" regulates peripheral inflammatory responses via alpha7 nicotinic acetylcholine receptors (alpha7 nAChRs) and that acetylcholine and nicotine regulate the expression of proinflammatory mediators such as TNF-alpha and prostaglandin E2 in microglial cultures. In a previous study we showed that ATP released by beta-amyloid-stimulated microglia induced reactive oxygen species (ROS) production, in a process involving the P2X7 receptor (P2X7R), in an autocrine fashion. These observations led us to investigate whether stimulation by nicotine could regulate fibrillar beta amyloid peptide (1-42) (fA beta(1-42))-induced ROS production by modulating ATP efflux-mediated Ca2+ influx through P2X7R. Nicotine inhibited ROS generation in fA beta(1-42)-stimulated microglial cells, and this inhibition was blocked by mecamylamine, a non-selective nAChR antagonist, and a-bungarotoxin, a selective alpha7 nAChR antagonist. Nicotine inhibited NADPH oxidase activation and completely blocked Ca2+ influx in fA beta(1-42)-stimulated microglia. Moreover, ATP release from fA beta(1-42)-stimulated microglia was significantly suppressed by nicotine treatment. In contrast, nicotine did not inhibit 2',3'-O-(4-benzoyl)-benzoyl ATP (BzATP)-induced Ca2+ influx, but inhibited ROS generation in BzATP-stimulated microglia, indicating an inhibitory effect of nicotine on a signaling process downstream of P2X7R. Taken together, these results suggest that the inhibitory effect of nicotine on ROS production in fA beta(1-42)-stimulated microglia is mediated by indirect blockage of ATP release and by directly altering the signaling process downstream from P2X7R.
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Animales , Ratas , Adenosina Trifosfato/análogos & derivados , Amiloide/metabolismo , Péptidos beta-Amiloides/farmacología , Calcio/metabolismo , Activación Enzimática/efectos de los fármacos , Microglía/citología , NADPH Oxidasas/metabolismo , Nicotina/farmacología , Antagonistas Nicotínicos/farmacología , Fragmentos de Péptidos/farmacología , Ratas Sprague-Dawley , Especies Reactivas de Oxígeno/metabolismo , Receptores Nicotínicos/metabolismo , Receptores Purinérgicos P2/metabolismoRESUMEN
PURPOSE: To compare the effectiveness between minimally invasive plate osteosynthesis (MIPO) and interlocking IM nailing in the treatment of distal tibia fracture without involvement of ankle joint retrospectively. MATERIALS AND METHODS: 38 patients with distal tibia fracture from Jan. 2004 to Oct. 2005 were divided into two groups. Minimum follow-up was for 12 months. Group MIPO consisted of 18 patients were treated with MIPO and group Nail consisted of 20 patients were treated with interlocking intramedullary nail. The results were compared between two groups by assessing bony union time and operation time. Clinical evaluation was evaluated by Olerud score. RESULTS: The mean bony union time was 14.4 weeks (12~17 weeks) in group MIPO and 16.7 weeks (13~19 weeks) in group Nail (p=0.011). The mean operation time was 1.05 hours (0.6~1.6 hours) in group MIPO and 0.74 hours (0.4~1.1 hours) in group Nail (p=0.044). The Olerud score was 83.8 (75~100) in group MIPO and was 89.6 (70~100) in group Nail (p=0.075). In Complication, group MIPO showed one metal failure and two skin irritations, group Nail showed three superficial wound infections. CONCLUSION: MIPO was the shorter bony union time and the longer operation time than the interlocking intramedullary nailing. There were no significant differences between the two groups in clinical results.