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1.
Microb Pathog ; 175: 105992, 2023 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-36649779

RESUMEN

Infections due to Acinetobacter baumannii (A. baumannii) are rapidly increasing worldwide and consequently therapeutic options for treatment are limited. The emergence of multi drug resistant (MDR) strains has rendered available antibiotics ineffective, necessitating the urgent discovery of new drugs and drug targets. The vitamin B6 biosynthetic pathway has been considered as a potential antibacterial drug target but it is as yet uncharacterized for A. baumannii. In the current work, we have carried out in silico and biochemical characterization of Erythrose-4-phosphate dehydrogenase (E4PDH) (EC 1.2.1.72). This enzyme catalyzes the first step in the deoxyxylulose-5-phosphate (DXP) dependent Vitamin B6 biosynthetic pathway i.e. the conversion of d-erythrose-4-phosphate (E4P) to 4-Phosphoerythronate. E4PDH also possesses an additional activity whereby it can catalyze the conversion of Glyceraldehyde-3-phosphate (G3P) to 1,3 bisphosphoglycerate (1,3BPG). Our studies have revealed that this enzyme exhibits an alternate moonlighting function as a cell surface receptor for the human iron transport proteins transferrin (Tf) and lactoferrin (Lf). The present work reports the internalization of Tf and consequent iron acquisition as an alternate strategy for iron acquisition. Given its essential role in two crucial pathways i.e. metabolism and iron acquisition, A. baumannii E4PDH may play a vital role in bacterial pathogenesis.


Asunto(s)
Acinetobacter baumannii , Humanos , Antibacterianos/farmacología , Hierro/metabolismo , Vitamina B 6 , Oxidorreductasas , Fosfatos/farmacología , Farmacorresistencia Bacteriana Múltiple
2.
Arch Orthop Trauma Surg ; 143(1): 269-276, 2023 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-34259926

RESUMEN

BACKGROUND: The use of social media in orthopaedic surgery and its allied associations has not been studied. There are various associations which are actively engaged in social media platforms to enhance their impact with their users across the globe. We evaluated the social media presence and extent of involvement of orthopaedics journals and their publishing companies, orthopaedics organizations, orthopaedics device firms, and health organizations. MATERIALS AND METHODS: We compiled a global list of orthopaedics journals and publishing companies, orthopaedics organizations, orthopaedics device firms and health organizations affiliated to orthopaedics (USA) through the internet and their reliable online links. All the categories and their contents were screened on various social media networking sites (Facebook, Twitter, and LinkedIn) in terms of their membership, likes, followers and active participation. Comparable variables were selected and compared. RESULTS: Orthopaedics journals corresponding to sports and health were more notable than others on social networking platforms, i.e., British Journal of Sports Medicine and American Journal of Sports Medicine. Medscape, Lancet, and Elsevier being the multispeciality health and information publishing companies have remarkable participation on Facebook, Twitter and LinkedIn. Medtronic has maximum followers on all discussed social networking sites. Mayo Clinic Rochester, Minnesota and Cleveland Clinic, Cleveland, Ohio were more admired than other orthopaedics hospitals on Facebook and Twitter in USA. American Academy of Orthopaedic Surgeons was the most popular society on Facebook and LinkedIn while American Orthopaedics Society for Sports Medicine was most talked about on twitter. CONCLUSIONS: Although the active involvement of orthopaedics journals and their publishers is lower than multispecialty publishing companies but increasing trends were found recently. Orthopaedics organisations and device firms were actively involved on social networking while orthopaedics multispeciality health organizations associated with renowned universities have huge likes or followers. The social networking has the potential to flourish these journals and organisations in the near future as large populations over the globe have been actively participating and growing in their numbers exponentially.


Asunto(s)
Procedimientos Ortopédicos , Ortopedia , Medios de Comunicación Sociales , Humanos , Publicaciones Periódicas como Asunto
3.
Eur J Orthop Surg Traumatol ; 33(4): 1223-1230, 2023 May.
Artículo en Inglés | MEDLINE | ID: mdl-35543884

RESUMEN

INTRODUCTION: Consensus is lacking regarding management of posttraumatic infected diaphyseal nonunions of femur following intramedullary nailing. Present study reports outcomes of single stage standardised treatment protocol using monolateral rail external fixator/limb reconstruction system in this type of infected diaphyseal femoral nonunions. METHODS: This retrospective study included 26 patients with mean age of 31.7 years having posttraumatic infected diaphyseal femoral nonunions following intramedullary nailing and managed with radical debridement and monolateral rail fixator. The results were assessed by Association for the Study and Application of the Method of Ilizarov criteria. RESULTS: Mean intraoperative bone gap was 4.34 (range, 2-7) cm. Mean gain in bone length was 4.04 (range, 0-7) cm. Fracture united primarily in 22 cases and after freshening of edges, fixator adjustment and fibular grafting in three more patients. Infection persisted in one patient. Most common complications were superficial pin tract infection (15 patients) and loss of more than 30° knee flexion (13 patients). The bone results were excellent, good, and poor in 15, 9, and 2 patients, respectively. The functional results were excellent, good, fair, and poor in 11,13,1 and 1 patient, respectively. CONCLUSION: Single stage procedure including radical debridement, acute docking, distraction osteogenesis at corticotomy site and stabilization with monolateral rail fixator reliably achieves good to excellent bone and functional results, union and eradication of infection in majority of infected nonunions of femoral diaphysis developing after intramedullary fixation. We recommend acute docking in bone gap ≤ 5 cm.


Asunto(s)
Fracturas del Fémur , Fijación Intramedular de Fracturas , Fracturas no Consolidadas , Osteogénesis por Distracción , Humanos , Adulto , Estudios Retrospectivos , Diáfisis , Fémur/cirugía , Osteogénesis por Distracción/métodos , Fijadores Externos , Fracturas del Fémur/cirugía , Fracturas no Consolidadas/etiología , Fijación Intramedular de Fracturas/efectos adversos , Resultado del Tratamiento
4.
Arch Orthop Trauma Surg ; 142(8): 1923-1932, 2022 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-33983526

RESUMEN

AIM: The present prospective randomized study compared the bone transport technique (BT) and Masquelet technique (MT) in the treatment of infected gap non-union of the tibia. PATIENTS AND METHODS: Total 25 patients with infected gap non-union of the tibia with bone gap upto 6 cm were randomised into BT group (group I, 13 patients) and MT (group II, 12 patients). The mean age was 31.77 years in group I and 39.67 years in group II. The mean intra-operative bone gap was 3.92 cm in group I and 3.79 cm in group II. Monolateral fixator was applied in nine patients each in both groups, while four and three fractures were stabilized with ring fixators in group I and II, respectively. Mean follow-up was 31.62 months and 30.42 months in group I and II, respectively. Bone and functional results were compared using the association for the study and application of the method of Ilizarov (ASAMI) criteria. RESULTS: The average fixator period was 9.42 and 16.33 months in group I and II, respectively (p < 0.001). Union was achieved in 12 (92%) patients and 6 (50%) patients in group I and II, respectively. The functional results were excellent (eight and two), good (four and six), fair (zero and three) and poor (one and one) in group I and II respectively, (p 0.23). The Bone results were excellent, good and poor in nine, three and one patients in group I, and three, three and six patients in group II respectively, (p 0.109). CONCLUSIONS: The functional and bone results were comparable but more reliable in bone transport than the Masquelet technique. The fixator duration and incidence of non-union were higher in MT group. Ilizarov bone transport technique should be preferred in infected non-union of the tibia with bone loss upto 6 cm.


Asunto(s)
Fracturas no Consolidadas , Técnica de Ilizarov , Fracturas de la Tibia , Adulto , Fijadores Externos , Curación de Fractura , Fracturas no Consolidadas/cirugía , Humanos , Estudios Prospectivos , Estudios Retrospectivos , Tibia/cirugía , Fracturas de la Tibia/cirugía , Resultado del Tratamiento
5.
Chin J Traumatol ; 22(5): 281-285, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31447309

RESUMEN

PURPOSE: The medial patellofemoral ligament (MPFL) acts as primary restraint to lateral patellar dislocation and its rupture has been reported in almost all cases of acute patellar dislocation. Various surgical techniques have been described for MPFL reconstruction, using many femoral and patellar fixation techniques and different grafts. This article details our technique for MPFL reconstruction using semitendinosus graft which avoids the use of implant at patellar end. METHODS: Twenty patients (8 males and 12 females) with complaints regarding acute and chronic lateral patellar instability were evaluated and treated by MPFL reconstruction procedure. The mean age of patients was 21 years (range 17-34 years). MPFL reconstruction was performed using semitendinosus graft passing through two parallel, obliquely directed tunnels created in patella. Fixation of graft was done with an interference screw only at the femoral end. Mean follow-up period after intervention was 26.4 months (range 23-30 months). Results were evaluated using Kujala score. RESULTS: All patients gained adequate patellar stability and full arc of motion. No incidence of patella fracture was noted. There were no postoperative complications related to the procedure. There was no recurrence of instability in patella at final follow-up. CONCLUSION: Passing the graft through the tunnels in patella without use of any implant has given excellent functional outcome and moreover has the advantages of less implant-related complications and cost-effectiveness.


Asunto(s)
Procedimientos Ortopédicos/métodos , Luxación de la Rótula/cirugía , Ligamento Rotuliano/cirugía , Procedimientos de Cirugía Plástica/métodos , Adolescente , Adulto , Autoinjertos , Tornillos Óseos , Femenino , Músculos Isquiosurales/trasplante , Humanos , Masculino , Resultado del Tratamiento , Adulto Joven
6.
Chin J Traumatol ; 20(1): 39-44, 2017 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-28202370

RESUMEN

PURPOSE: New research is focusing on the use of autologous growth factors to increase the effect of bone fracture healing while decreasing the amount of healing time for the patient. Platelets have been demonstrated to be the natural storage vessel for several growth factors and cytokines that promote blood coagulation, tissue repair, and the process of bone mineralization. The present study aims to evaluate the role of platelet-rich plasma (PRP) in healing of acute femoral shaft fractures radiologically. We hypothesize that it provides artificial hematoma and releases various growth factors. METHODS: This prospective randomized study was carried out in 72 patients of traumatic fracture of the femoral shaft operated with interlocking nails (closed or open). Patients were divided into two groups: study group A (n = 33) treated with intramedullary nailing & PRP injection/gel application in the same setting; and control group B (n = 39) treated with intramedullary nailing without PRP application. Both groups were further divided into two subgroups. Study group included subgroup A1 (n = 14) operated with closed intramedullary nailing and PRP injection at the fracture site under radiological control, and subgroup A2 (n = 19) operated with open intramedullary nailing and PRP gel along with fibrin membrane application at the fracture site; while control group included subgroup B1 (n = 16) operated with closed intramedullary nailing, and subgroup B2 (n = 23) operated with open intramedullary nailing. Radiological assessment of fracture healing was done by measuring the cortex to callus ratio every month till union at 6 months. RESULTS: Measurements of mean cortex to callus ratio revealed significant difference between the groups A & B at third and fourth months. Measurements of mean cortex to callus ratio did not reveal significant difference between the subgroups at first and sixth months. A statistically significant difference was observed between subgroups A1 & B2 and B1 & B2 at the second month; between subgroups A1 & B2, A2 & B2 and B1 & B2 at the third month; and between subgroups A1 & B2 at fourth and fifth months. CONCLUSION: PRP has no effect on femoral shaft fracture healing treated with closed intramedullary nailing. However, PRP and matrix scaffold provided by fibrin membrane may provide an artificial hematoma effect in the initial phase of healing in open or failed closed intramedullary nailing.


Asunto(s)
Fracturas del Fémur/cirugía , Fijación Intramedular de Fracturas , Curación de Fractura , Plasma Rico en Plaquetas , Enfermedad Aguda , Adolescente , Adulto , Fracturas del Fémur/diagnóstico por imagen , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos
7.
J Ayub Med Coll Abbottabad ; 29(3): 462-465, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-29076683

RESUMEN

BACKGROUND: Due to precarious blood supply, skin coverage for defects of leg, heel, dorsum of foot and the ankle has been a complicated task for plastic surgeons & orthopaedic surgeons. The present study aimed to prospectively evaluate the outcome of distally based sural flap for coverage of defects distal third of leg, ankle & foot. METHODS: In this study 15 patients with soft tissue defects on distal third of leg in (n=2), heel (n=4), medial malleolus (n=3), lateral malleolus (n=1), Achillis tendon (n=2), anterior ankle (n=2) and in dorsum of foot (n=1) were operated for coverage of defect by distally based sural flap. All the cases were done as secondary procedures. RESULTS: All the flaps showed good results except five minor complications. Three flaps showed superficial skin necrosis and two showed partial tip necrosis. CONCLUSIONS: Distally based sural artery flap is very useful in covering the defects of lower leg, heel and dorsum of foot. It is reliable, easy to raise with minimal morbidity to the patient. This flap does not sacrifice any of the major vessels of the limb and hence it is very safe flap.


Asunto(s)
Traumatismos de la Pierna/cirugía , Traumatismos de los Tejidos Blandos/cirugía , Colgajos Quirúrgicos , Adolescente , Adulto , Niño , Femenino , Humanos , Masculino , Persona de Mediana Edad , Complicaciones Posoperatorias , Estudios Prospectivos , Colgajos Quirúrgicos/irrigación sanguínea , Adulto Joven
8.
J Orthop Traumatol ; 18(1): 31-36, 2017 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-27468849

RESUMEN

BACKGROUND: To evaluate results of a technique for treating neglected epiphyseal injuries of the distal radius with ulnar impaction. MATERIALS AND METHODS: This retrospective study involved six cases (four males; two females), all of whom sustained the primary injury during childhood (range 9-12 years of age). All presented with wrist deformity and ulnar-sided wrist pain. They were managed with osteotomy of the distal radius, osteotomy and shortening of the ulna, harvesting the bone grafts, and distal radioulnar joint (DRUJ) reduction performed simultaneously through a dorsal midline approach. Mean follow-up was 30 months (range 24-36). RESULTS: Deformity correction and pain relief was observed in all patients. Flexion arc increased from an average of 60° to 102.5°, supination from an average of 31.67° to 67.50°, and pronation from an average of 30.83° to 61.67°. The mean preoperative DASH score was 87.5, which improved to 18.72 postoperatively. CONCLUSION: Neglected epiphyseal injuries of the distal radius are difficult to manage and many variations are described for handing each of the associated problems. Our technique provides an option for managing this injury with an easy surgical approach, single incision, and cost effectiveness. All the four components of the surgery, which include osteotomy of the distal radius, osteotomy of the ulna, harvesting the bone grafts, and DRUJ reduction were done through a single incision and in a single sitting. Level of evidence IV.


Asunto(s)
Fracturas Mal Unidas/cirugía , Deformidades Adquiridas de la Articulación/cirugía , Osteotomía , Fracturas del Radio/complicaciones , Cúbito/cirugía , Articulación de la Muñeca , Adolescente , Niño , Epífisis/lesiones , Femenino , Fracturas Mal Unidas/diagnóstico por imagen , Fracturas Mal Unidas/etiología , Humanos , Deformidades Adquiridas de la Articulación/diagnóstico por imagen , Deformidades Adquiridas de la Articulación/etiología , Masculino , Fracturas del Radio/diagnóstico por imagen , Fracturas del Radio/cirugía , Estudios Retrospectivos , Tiempo de Tratamiento , Resultado del Tratamiento , Cúbito/diagnóstico por imagen , Adulto Joven
9.
J Orthop Traumatol ; 15(3): 173-9, 2014 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-24879360

RESUMEN

BACKGROUND: Posterior wall fractures are the most common of all acetabular fractures, and there is universal consensus that displaced fractures are best treated with anatomical reduction and stable internal fixation. Though early and mid term results for such studies are available, few shed light on long term results. This study was performed to evaluate long term functional and radiological outcomes in patients with posterior wall acetabular fractures and to determine factors that may contribute adversely to a satisfactory final outcome. MATERIALS AND METHODS: We retrospectively analysed the hospital records for patients who underwent open reduction and internal fixation (ORIF) for posterior wall acetabular fractures. Twenty-five patients (20 men, five women), including one with bilateral posterior wall fracture, with a mean age of 41.28 ± 7.16 years (range 25-60 years) and a mean follow-up of 12.92 ± 6.36 years (range 5-22 years) who met the inclusion criteria formed the study cohort. Matta's criteria were used to grade postoperative reduction and final radiological outcome. Functional outcome at final follow-up was assessed according to d'Aubigné and Postel score. RESULTS: Anatomic reduction was achieved in 22 hips, imperfect in four and poor in none. Radiological outcome at final follow-up revealed excellent results in ten hips, good in eight, fair in five and poor in three. The final d'Aubigné and Postel scores were excellent in 14 hips, good in six and fair and poor in three each. Patients with anatomical reduction had a favourable functional and radiological long term outcome. However, the presence of associated injuries in lower limbs and a body mass index (BMI) >25 adversely affected the final functional outcome. Osteonecrosis was seen in three patients, heterotopic ossification in two and Morel Lavallee lesion in one. One patient had postoperative sciatic nerve palsy, which recovered 6 weeks after surgery. CONCLUSION: Anatomic postoperative reduction leads to optimal functional and radiological outcome on long term follow-up; however, the presence of associated lower-limb injuries and BMI >25 adversely affects a satisfactory final outcome in patients with posterior wall acetabular fractures. LEVEL OF EVIDENCE: (Level 4) Retrospective case series.


Asunto(s)
Acetábulo/lesiones , Fijación Interna de Fracturas , Fracturas Óseas/cirugía , Adulto , Femenino , Estudios de Seguimiento , Fracturas Óseas/diagnóstico por imagen , Fracturas Óseas/fisiopatología , Humanos , Masculino , Persona de Mediana Edad , Radiografía , Recuperación de la Función , Estudios Retrospectivos , Factores de Tiempo , Resultado del Tratamiento
10.
Chin J Traumatol ; 16(2): 118-21, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-23540903

RESUMEN

Nonunion in tibial plateau fractures is very rare. Limited literature is available on Pubmed search on intraarticular tibial nonunion. Most of the cases reported have been following failed surgical treatment and none was neglected fractures. Three patients of isolated and neglected medial tibial plateau nonunion with almost similar demographic profile are reported in this paper. All the three patients were managed by minimally invasive compression fixation using lag screws supplemented with limb realignment procedure of high tibial osteotomy. We discussed the injury mechanism, management and rehabilitation in such cases and reviewed the available literature regarding such a presentation.


Asunto(s)
Fijación Interna de Fracturas/métodos , Seudoartrosis/cirugía , Fracturas de la Tibia/cirugía , Adulto , Tornillos Óseos , Curación de Fractura , Humanos , Masculino , Osteotomía
11.
Chin J Traumatol ; 16(6): 365-7, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-24295585

RESUMEN

Radial nerve palsy is the most common neurological involvement in humeral shaft fractures. But combined radial and median nerve injury in a closed diaphyseal fracture of the humerus is rare. Combined injury to both radial and median nerve can cause significant disability. A detailed clinical examination is therefore necessary following humeral shaft fractures. We report a patient with closed diaphyseal humeral fracture (AO 12A-2.3) together with radial and median nerve palsy, its management and review of the literature. As the patient had two nerves involved, surgical exploration was planned. Fracture was reduced and fixed with a 4.5 mm narrow dynamic compression plate. There was no external injury to both radial and median nerves on surgical exploration. Neurological recovery started at 3 weeks' follow-up. Complete recovery was seen at 12 weeks. Careful clinical examination is of the utmost importance in early diagnosis of combined nerve injuries, which allows better management and rehabilitation of the patient.


Asunto(s)
Nervio Mediano , Neuropatía Radial , Placas Óseas , Humanos , Fracturas del Húmero/cirugía , Húmero
12.
Chin J Traumatol ; 16(6): 339-43, 2013.
Artículo en Inglés | MEDLINE | ID: mdl-24295579

RESUMEN

OBJECTIVE: Metaphyseal-diaphyseal fractures of the distal radius are a major treatment dilemma and orthopaedic surgeons have to pay due consideration to restoration of anatomy of distal radius together with rotation of the radial shaft and maintenance of radial bow and interosseous space. We performed this study to evaluate the clinic-radiological outcome of metaphyseal-diaphyseal fractures of the distal radius treated with long volar locking plates. METHODS: This prospective study involved 27 patients (22 males and 5 females) with metaphyseal-diaphyseal fracture of the distal radius. Their mean age was (30.12+/-11.48) years (range 19-52 years) and the follow-up was 26.8 months (range 22-34 months). All patients underwent open reduction and internal fixation with a long volar locking plate. According to AO/OTA classification, there were 7 type A3, 13 type C2 and 7 type C3 fractures. Subjective assessment was done based on the disabilities of the arm, shoulder and hand (DASH) questionnaire. Functional evaluation was done by measuring grip strength and range of motion around the wrist and the radiological determinants included radial angle, radial length, volar angle and ulnar variance. The final assessment was done according to Gartland and Werley scoring system. RESULTS: Postoperative radiological parameters were well maintained throughout the trial, and there was significant improvement in the functional parameters from 6 weeks to final follow-up. The average DASH scores improved from 37.5 at 6 weeks to 4.2 at final follow-up. Final assessment using Gartland and Werley scoring system revealed 66.67% (n equal to 18) excellent and 33.33% (n equal to 9) good results. There was one case of superficial infection which responded to antibiotics and another carpel tunnel syndrome which was managed conservatively. CONCLUSION: Volar locking plate fixation for metaphyseal-diaphyseal fractures of distal radius is associated with excellent to good functional outcome, early rehabilitation and minimal complications.


Asunto(s)
Fracturas del Radio , Radio (Anatomía) , Placas Óseas , Fijación Interna de Fracturas , Humanos , Estudios Prospectivos
13.
Int Wound J ; 10(4): 455-60, 2013 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-22697785

RESUMEN

The recurrence of pressure ulcers (PrUs) and dehiscence of reconstructive flap have always been a problem. The present study aimed to evaluate the results of reconstructive flap surgeries in patients with spinal cord injury (SCI) having PrUs, using classic and modified flaps with improvisations to decrease wound dehiscence, flap necrosis and tension in flap. This is a prospective clinical study. The setting was a tertiary care centre in northern India. Thirty-five patients with SCI having 37 stage III and IV PrUs. PrUs were treated using classic and modified flaps with improvisations. The outcome was evaluated using criteria of wound dehiscence, flap necrosis and recurrence. The results of flap surgery were excellent in 32 (86·48%) patients, good in 4 (10·81%) patients and poor in 1 (2·7%) patient. Partial flap necrosis (2·7%), low incidence of PrU recurrence rate at flap site (5·4%) and overall PrU recurrence (11·4%) were the complications observed. Improvisation of classic and modified techniques of flap surgeries along with reinforcement of general care principles of paraplegia can be effective in minimising complications often associated with PrU reconstructive surgery thus improving the ultimate outcome.


Asunto(s)
Procedimientos de Cirugía Plástica/métodos , Úlcera por Presión/etiología , Úlcera por Presión/cirugía , Traumatismos de la Médula Espinal/complicaciones , Colgajos Quirúrgicos/irrigación sanguínea , Cicatrización de Heridas/fisiología , Adolescente , Adulto , Estudios de Cohortes , Desbridamiento/métodos , Femenino , Estudios de Seguimiento , Rechazo de Injerto , Supervivencia de Injerto , Humanos , India , Masculino , Persona de Mediana Edad , Paraplejía/complicaciones , Paraplejía/diagnóstico , Complicaciones Posoperatorias/fisiopatología , Complicaciones Posoperatorias/terapia , Úlcera por Presión/fisiopatología , Estudios Prospectivos , Procedimientos de Cirugía Plástica/efectos adversos , Recurrencia , Medición de Riesgo , Índice de Severidad de la Enfermedad , Traumatismos de la Médula Espinal/diagnóstico , Centros de Atención Terciaria , Resultado del Tratamiento , Adulto Joven
14.
Environ Sci Pollut Res Int ; 30(44): 98609-98618, 2023 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-35796931

RESUMEN

Glass-ceramics with novel composition xZrO2.7P2O5.19CaO.24Na2O.(50-x)B2O3 (x = 0, 2, 4, 6, and 8 mol%) have been synthesized using melt quench technique. The synthesized compositions were characterized and analyzed by X-ray diffraction, field emission scanning electron microscopy, infrared absorption, and impedance spectroscopy. X-ray diffraction profiles of prepared samples confirm the existence of phases corresponding to Na3Ca6(PO4)5 crystal (with crystallite size ~ 23 nm). Infrared absorbance spectra reveal the presence of phosphate and borate units (PO3, PO4, BO3, BO4) in the glass matrix. Different dielectric parameters such as dielectric loss, electric modulus, and tangent loss were evaluated. Their variations with temperature and frequency confirm the non- Debye relaxation behavior of prepared samples. A phenomenal description of the capacitive behavior was studied by considering the circuit having a parallel combination of constant phase element and bulk resistance. The conduction is found to be governed by overlapping large polaron tunneling (OLPT) and follow OLPT model. The results indicate that ZrO2 substituted alkali phosphoborate glass-ceramics can be used as eco-friendly and safe dielectric materials.


Asunto(s)
Álcalis , Circonio , Circonio/química , Impedancia Eléctrica , Espectroscopía Dieléctrica , Cerámica/química
15.
Injury ; 53(10): 3464-3470, 2022 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-36008173

RESUMEN

BACKGROUND: Management of open fractures of tibia is still a matter of debate due to high incidence of infections. Traditionally external fixators have been advocated in managing open tibial fractures. Due to limited efficacy of systemic antibiotics, recently antibiotic coated intramedullary interlocking nails have been developed for the management of open tibia fractures. Therefore, we conducted this prospective randomized study to compare the functional and radiological outcomes of primary ring fixator versus antibiotic coated nail in open diaphyseal tibial fractures. METHODS: The study included 32 patients with Gustilo-Anderson type II and type IIIA fractures of tibial diaphysis. Out of them 16 patients were managed with Ring External Fixator (Group I) and 16 were managed with OssiproÒ gentamicin intramedullary interlocking tibial nail (Group II). The radiological and functional outcomes were assessed at final follow-up according to and SMFA criteria. Statistical analysis of the data was performed using IBM SPSS statistics 2.0 software. Chi square test and independent student t-test were used and a P value <0.05 was considered statistically significant RESULTS: Union was achieved in 15 patients (93.8%) in group I and 13 patients (81.2%) in group II. Pin tract infection was seen in 6 patients (37.5%) in group I, whereas infection was present in 2 patients (12.5%) in group II. Bone results were excellent in 13 patients (81.3%), good in 2 patients (12.5%), poor in one patient (6.3%). In group II, bone results were excellent in 12 patients (75%), good in one patient (6.2%), poor in 3 patients (18.8%). At 1 year of final follow up, mean SMFA score was 24.41±5.87 in group I, whereas mean SMFA score was 23.703±8.02 in group II. CONCLUSION: Ring fixator as well as antibiotic coated tibial interlocking nail achieved comparable rates of union in the present study. Complication rates were similar in both the groups and the functional and radiological outcomes were comparable in both groups. Results of this study indicate that although ring fixation is an established option for management of open tibial fractures, antibiotic-coated intramedullary nail is also a reliable option in open Grade II and grade IIIA injuries. LEVEL OF EVIDENCE: Level II.


Asunto(s)
Fijación Intramedular de Fracturas , Fracturas Abiertas , Fracturas de la Tibia , Antibacterianos/uso terapéutico , Clavos Ortopédicos , Diáfisis/diagnóstico por imagen , Diáfisis/cirugía , Fijación Intramedular de Fracturas/métodos , Curación de Fractura , Fracturas Abiertas/complicaciones , Fracturas Abiertas/diagnóstico por imagen , Fracturas Abiertas/cirugía , Gentamicinas , Humanos , Estudios Prospectivos , Tibia , Fracturas de la Tibia/complicaciones , Fracturas de la Tibia/diagnóstico por imagen , Fracturas de la Tibia/cirugía , Resultado del Tratamiento
16.
Bioorg Med Chem Lett ; 20(3): 893-5, 2010 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-20047831

RESUMEN

A series of benzyl-[3-(benzylamino-methyl)-cyclohexylmethyl]-amine derivatives with different substitution pattern on the aromatic ring have been prepared and evaluated for their antibacterial activity against Gram-positive and Gram-negative bacterial strains. Most of the compounds exhibit potent activity against Pseudomonas aeruginosa and Staphylococcus epidermidis while compounds 6l and 6m showed antibacterial activity against all the four bacterial strains with MIC values ranging from 0.002 to 0.016 microg/mL and no hemolytic activity up to 512 microg/mL in mammalian erythrocytes was observed.


Asunto(s)
Antibacterianos/síntesis química , Antibacterianos/farmacología , Farmacorresistencia Bacteriana Múltiple/fisiología , Bencilaminas/síntesis química , Bencilaminas/farmacología , Ciclohexanos/síntesis química , Ciclohexanos/farmacología , Farmacorresistencia Bacteriana Múltiple/efectos de los fármacos , Bacterias Gramnegativas/efectos de los fármacos , Bacterias Gramnegativas/crecimiento & desarrollo , Bacterias Grampositivas/efectos de los fármacos , Bacterias Grampositivas/crecimiento & desarrollo , Humanos , Pruebas de Sensibilidad Microbiana/métodos
17.
J Spinal Cord Med ; 33(4): 396-400, 2010.
Artículo en Inglés | MEDLINE | ID: mdl-21061899

RESUMEN

STUDY DESIGN: Prospective clinical study. BACKGROUND: Pressure ulcers interfere with the rehabilitation process in patients with spinal cord injury (SCI) and are a significant deterrent to participation in activities that contribute to independent, productive, and satisfying life. OBJECTIVE: To evaluate the effect of surgery for pressure ulcers on general health and quality of life in patients with SCI. SETTING: Tertiary care center in northern India. METHODS: Various types of flap surgery were performed on 30 patients with SCI and 32 pressure ulcers (stages III and IV). Outcome was evaluated using general improvement in health (hemoglobin, serum proteins, and general well-being), patient satisfaction, and global quality of life scores (according to the visual analog scale). RESULTS: At admission, the mean values of global quality of life, hemoglobin, serum albumin, and total serum proteins were 50.15 (range, 30-65), 8.75 g/dL (range, 6-12 g/dL), 3.12 g/dL (range, 2.9-4.3 g/dL), and 5.21 (range, 5-6.2 g/dL), respectively. At 6-month follow up, mean values of global quality of life score, hemoglobin, serum albumin, and total serum proteins were 87.36 (range, 44-96), 10.85 g/dL (range, 8.2-13.5 g/dL), 3.89 g/dL (range, 3.2-4.5 g/dL), and 6.43 g/dL (range, 5.85-6.70 g/dL), respectively. The overall rise in quality of life scores, hemoglobin, serum albumin, and total serum proteins was statistically significant. Most of the patients (76.7%) reported improvement in subjective well-being, and 83.3% were satisfied with the ultimate outcome of the surgery. CONCLUSION: Results suggest that surgery for stages III and IV pressure ulcers offers the greatest benefit to the patients in terms of improvement in general health (anemia, hypoproteinemia, and general well-being) and quality of life.


Asunto(s)
Úlcera por Presión/psicología , Úlcera por Presión/cirugía , Calidad de Vida , Colgajos Quirúrgicos , Adolescente , Adulto , Albúminas/metabolismo , Proteínas Sanguíneas/metabolismo , Femenino , Estudios de Seguimiento , Hemoglobinas/metabolismo , Humanos , India , Masculino , Persona de Mediana Edad , Examen Neurológico , Pruebas Neuropsicológicas , Úlcera por Presión/sangre , Úlcera por Presión/etiología , Estudios Retrospectivos , Traumatismos de la Médula Espinal/complicaciones , Factores de Tiempo , Resultado del Tratamiento , Adulto Joven
18.
Int Orthop ; 34(8): 1285-90, 2010 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-19820935

RESUMEN

Open reduction and internal fixation in distal tibial fractures jeopardises fracture fragment vascularity and often results in soft tissue complications. Minimally invasive osteosynthesis, if possible, offers the best possible option as it permits adequate fixation in a biological manner. Seventy-nine consecutive adult patients with distal tibial fractures, including one patient with a bilateral fracture of the distal tibia, treated with locking plates, were retrospectively reviewed. The 4.5-mm limited-contact locking compression plate (LC-LCP) was used in 33 fractures, the metaphyseal LCP in 27 fractures and the distal medial tibial LCP in the remaining 20 fractures. Fibula fixation was performed in the majority of comminuted fractures (n = 41) to maintain the second column of the ankle so as to achieve indirect reduction and to prevent collapse of the fracture. There were two cases of delayed wound breakdown in fractures fixed with the 4.5-mm LC-LCP. Five patients required primary bone grafting and three patients required secondary bone grafting. All cases of delayed union (n = 7) and nonunion (n = 3) were observed in cases where plates were used in bridge mode. Minimally invasive plate osteosynthesis (MIPO) with LCP was observed to be a reliable method of stabilisation for these fractures. Peri-operative docking of fracture ends may be a good option in severely impacted fractures with gap. The precontoured distal medial tibial LCP was observed to be a better tolerated implant in comparison to the 4.5-mm LC-LCP or metaphyseal LCP with respect to complications of soft tissues, bone healing and functional outcome, though its contour needs to be modified.


Asunto(s)
Placas Óseas , Fijación Intramedular de Fracturas/métodos , Procedimientos Quirúrgicos Mínimamente Invasivos/métodos , Fracturas de la Tibia/cirugía , Adolescente , Adulto , Trasplante Óseo , Femenino , Fijación Intramedular de Fracturas/efectos adversos , Fijación Intramedular de Fracturas/instrumentación , Curación de Fractura , Fracturas Conminutas/cirugía , Fracturas no Consolidadas/etiología , Humanos , Masculino , Persona de Mediana Edad , Complicaciones Posoperatorias/radioterapia , Estudios Retrospectivos , Resultado del Tratamiento , Adulto Joven
19.
Foot Ankle Surg ; 16(3): e76-8, 2010 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-20655006

RESUMEN

Extraskeletal osteochondroma of the foot are rare benign cartilaginous tumours. We present a case of soft-tissue osteochondroma in the heel pad superficial to the postero-inferior aspect of the calcaneus. We propose the pathogenesis of this lesion might be related to metaplasia in the plantar aponeurosis as described in literature, or it may be a fracture of the calcaneal osteochondroma, growing and presenting as soft-tissue lesion in the heel pad.


Asunto(s)
Osteocondroma/diagnóstico , Neoplasias de los Tejidos Blandos/diagnóstico , Adulto , Biopsia , Diagnóstico Diferencial , Estudios de Seguimiento , Talón , Humanos , Masculino , Procedimientos Ortopédicos/métodos , Osteocondroma/cirugía , Fotomicrografía , Neoplasias de los Tejidos Blandos/cirugía
20.
Forensic Sci Int ; 312: 110311, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32473526

RESUMEN

A large number of digital photos are being generated and with the help of advanced image editing software and image altering tools, it is very easy to manipulate a digital image nowadays. These manipulated or tampered images can be used to delude the public, defame a person's personality and business as well, change political views or affect the criminal investigation. The raw image can be mutilated in parts or as a whole image so there is a need for detection of what type of image tampering is performed and then localize the tampered region. Initially, single handcrafted manipulated images were used to detect the only image tampering present in the image but in a real-world scenario, a single image can be mutilated by numerous image manipulation techniques. Nowadays, multiple tampering operations are performed on the image and post-processing is done to erase the traces left behind by the tampering operation, making it more difficult for the detector to detect the tampering. It is seen that the recent techniques that are used to detect image manipulation are based on deep learning methods. In this paper, more focus is on the study of various recent image manipulation detection techniques. We have examined various image forgeries that can be performed on the image and various image manipulation detection and localization methods.

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