RESUMO
La ruptura de ligamento cruzado anterior (LCA) es la lesión de rodilla más común que se trata de una reconstruc- ción quirúrgica. El objetivo principal de esta revisión fue analizar la importancia de la función de los músculos isquiosurales como factor de riesgo de posibles lesiones de LCA. Se llevó a cabo siguiendo las normas Preferred Reported Item for Systematic Reviews and Meta- analyses (PRISMA). La fuente de la recopilación de datos fue la consulta directa de las bases de datos Pubmed, Sportdiscus, Web of Science y Scopus. Para la recuperación documental, se utilizaron varias palabras clave y se evaluó la calidad de los estudios que fueron seleccionados mediante la escala PEDro. Los déficits de la función muscular en los músculos isquiosurales se han relacionado con una mayor translación tibial anterior y, como consecuencia, un incremento del estrés tensional sobre el LCA entre los 10° y 45° de flexión de rodilla. Una co-activación de los músculos isquiosurales con el músculo cuádriceps femoral puede ser de gran ayuda para reducir los factores de riesgo de la lesión LCA.
SUMMARY: Anterior cruciate ligament (ACL) rupture is the most common knee injury to undergo surgery in the sports setting. The main objective of this review was to analyze the importance of hamstring function as a risk factor for potential ACL injury. It was conducted following the Preferred Reported Item for Systematic Reviews and Meta-analyses (PRISMA) guidelines. The source of data collection was direct consultation of the Pubmed, Sportdiscus, Web of Science and Scopus databases. For documentary retrieval, several key words were used and the quality of the studies that were selected was assessed using the PEDro scale. Muscle function deficits in the hamstrings have been related to increased anterior tibial translation and, as a consequence, increased tensional stress on the ACL between 10° and 45° of knee flexion. A co-activation of the hamstrings with the quadriceps may be helpful in reducing the risk factors for ACL injury.
Assuntos
Humanos , Estresse Mecânico , Músculos Isquiossurais/fisiopatologia , Lesões do Ligamento Cruzado Anterior/etiologia , Fatores de Risco , Esportes de EquipeRESUMO
Objective: To summarize the research progress of tibial transverse transport (TTT) in treatment of chronic ischemic diseases of the lower extremities. Methods: The related literature was systematically searched and the mechanisms, clinical treatment methods, clinical efficacy, indications, contraindications, and complications of TTT were discussed. Results: Based on the law of tension-stress, TTT is a new method in the treatment of chronic ischemic diseases of the lower extremities. It can relieve the ischemic symptoms, promote the wound healing, and increase the limb salvage rate. The clinical application in recent years has shown good effectiveness, and the scope of application is expanding. Conclusion: Due to the current limited clinical application, the sample size of the TTT for the chronic ischemic diseases of the lower extremities is relatively small, and the follow-up time is limited. So its validity, long-term effectiveness, and bone transport standards are need further research.
RESUMO
[Objective]To explore the clinical efficiency,operative methods,apparatus assembly and postoperative administration of Ilizarov technique in the correction of talipes equinovarus.[Method]From January 2003 to May 2006,32 patients were corrected with QIN Si-he's orthotics devices on the Ilizarov principle of tension-stress,which involved 15 males and 17 females,the age ranged from 10 to 25 years.Among these patients,2 were caused by peroneal nerve injury,l by tumor in the vertebral canal,5 by meningocele,11 were caused by poliomyelitis,13 by congenital talipes equino-varus.In accordance with deformities,external fixator and limitied operative methods were dertermined.The limited release of soft tissue were performed in 7 patients,limited osteotomy in 25 patients.The dynamic muscle balance operation were performed in 9 patients with imbalance of muscle strength.According to the Ilizarov technique,the fixative rods were installed.The telescopic rods on the apparatus were rotated one week after the operation,the divices had corrective function in three-dimensional directions.The deformity of talipes equinovarus,internal rotation and drooping of the forefoot were gradually corrected,and the patients could bear weight and walked on the deformed foot.The mean duration of traction were 42 days,then removed the external fixator maintained with plaster for a site time.[Result]All patients were followed up from 12 months to 37 months with an average of 17 months.There was no recurrence of the deformity and feet function was good while walking on full weight-bearing.None of the complication occurred postoperatively sush as infection in the incision,neurovascular injury and ankle dislocation.[Conclusion]With Ilizarov technique to correct talipes equinovarus is a safe,minimally invasive and effective method.Combined with limited operation Ilizarov technique can correct severe talipes equinovarus which is unattainable by traditional orthopedic surgery,and shorten the treatment period,avoid severe complications.
RESUMO
Objective To investigate the shape and F-actin of human periodontal ligament fibroblasts(HPDLF) under different tension stress in vitro so as to learn the stress-biological effects of HPDLF. Methods HPDLF were cultivated for 6 passages and observed morphologically and identified by immunocytochemistry to be positive anti-vimentin and negative anti-keratin. HPDLF were divided into four groups: control (without tension stress), static tension stress (5 kPa), dynamic tension stress group 1 (5 to 0 to 5 kPa at the frequency of 3/min) and dynamic tension stress group 2 (5 to 2.5 to 5 kPa at the frequency of 3/min). The cells of each group were observed at the different time points of 16, 24, 32 h. The projection areas and shapes of cells as well as the structure of F-actin were examined by laser scanning confocal microscope and immunity fluorescence technique. The relationship among tension stress, time, shape and the structure of F-actin of HPDLF was analysed. Results In the dynamic tension stress group 1 and 2, the shape and the arrangement of F-actin of some HPDLF underwent regular changes at 16, 24 h, but the changes appeared to be obvious at 32 h. In the static tension stress group, it was found the increase of interspace of HPDLF, but no obvious changes in the structure of F-actin. Conclusion Different tension stress patterns had different effects on the shape and F-actin of HPDLF. Especially in the dynamic tension stress group 2, it showed direct ratio between the cell projection areas, the average fluorescence density and different loading time.