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array:24 [ "pii" => "S1807593222020439" "issn" => "18075932" "doi" => "10.6061/clinics/2013(12)11" "estado" => "S300" "fechaPublicacion" => "2013-01-01" "aid" => "2043" "copyright" => "CLINICS" "copyrightAnyo" => "2013" "documento" => "article" "crossmark" => 0 "licencia" => "https://creativecommons.org/licenses/by-nc/3.0/" "subdocumento" => "fla" "cita" => "Clinics. 2013;68:1543-7" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "itemSiguiente" => array:19 [ "pii" => "S1807593222020440" "issn" => "18075932" "doi" => "10.6061/clinics/2013(12)12" "estado" => "S300" "fechaPublicacion" => "2013-01-01" "aid" => "2044" "copyright" => "CLINICS" "documento" => "article" "crossmark" => 0 "licencia" => "https://creativecommons.org/licenses/by-nc/3.0/" "subdocumento" => "fla" "cita" => "Clinics. 2013;68:1548-54" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "en" => array:12 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">BASIC RESEARCH</span>" "titulo" => "Local and remote ischemic preconditioning protect against intestinal ischemic/reperfusion injury after supraceliac aortic clamping" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1548" "paginaFinal" => "1554" ] ] "contieneResumen" => array:1 [ "en" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig1" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 731 "Ancho" => 722 "Tamanyo" => 49524 ] ] "descripcion" => array:1 [ "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">Experimental protocol (A) and main arterial pressure variations during the experiment in the control, ischemia and reperfusion (IR), local ischemic preconditioning (LIPC), and remote ischemic preconditioning (RIPC) groups (B). Data are expressed as the mean ± SE for 7 animals per group. (*) <span class="elsevierStyleItalic">p</span><0.001: IR, LIPC, and RIPC <span class="elsevierStyleItalic">vs</span>. control, (†) <span class="elsevierStyleItalic">p</span><0.001: LIPC <span class="elsevierStyleItalic">vs</span>. control.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Nilon Erling, Edna Frasson de Souza Montero, Paulina Sannomiya, Luiz Francisco Poli-de-Figueiredo (in memoriam)" "autores" => array:4 [ 0 => array:3 [ "nombre" => "Nilon" "apellidos" => "Erling" "sufijo" => "Junior" ] 1 => array:2 [ "nombre" => "Edna Frasson" "apellidos" => "de Souza Montero" ] 2 => array:2 [ "nombre" => "Paulina" "apellidos" => "Sannomiya" ] 3 => array:2 [ "nombre" => "Luiz Francisco" "apellidos" => "Poli-de-Figueiredo (in memoriam)" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222020440?idApp=UINPBA00004N" "url" => "/18075932/0000006800000012/v1_202212011241/S1807593222020440/v1_202212011241/en/main.assets" ] "itemAnterior" => array:19 [ "pii" => "S1807593222020427" "issn" => "18075932" "doi" => "10.6061/clinics/2013(12)10" "estado" => "S300" "fechaPublicacion" => "2013-01-01" "aid" => "2042" "copyright" => "CLINICS" "documento" => "article" "crossmark" => 0 "licencia" => "https://creativecommons.org/licenses/by-nc/3.0/" "subdocumento" => "fla" "cita" => "Clinics. 2013;68:1537-42" "abierto" => array:3 [ "ES" => true "ES2" => true "LATM" => true ] "gratuito" => true "lecturas" => array:1 [ "total" => 0 ] "en" => array:12 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">BASIC RESEARCH</span>" "titulo" => "Gender differences in microcirculation: Observation using the hamster cheek pouch" "tienePdf" => "en" "tieneTextoCompleto" => "en" "tieneResumen" => "en" "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1537" "paginaFinal" => "1542" ] ] "contieneResumen" => array:1 [ "en" => true ] "contieneTextoCompleto" => array:1 [ "en" => true ] "contienePdf" => array:1 [ "en" => true ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig3" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 254 "Ancho" => 782 "Tamanyo" => 17047 ] ] "descripcion" => array:1 [ "en" => "<p id="spara30" class="elsevierStyleSimplePara elsevierViewall">Arteriolar vasoconstriction induced by phenylephrine and endothelin-1 according to dose.</p>" ] ] ] "autores" => array:1 [ 0 => array:2 [ "autoresLista" => "Diogo Guarnieri Panazzolo, Lucia Henriques Alves da Silva, Fátima Zely Garcia de Almeida Cyrino, Fernando Lencastre Sicuro, Luiz Guilherme Kraemer-Aguiar, Eliete Bouskela" "autores" => array:6 [ 0 => array:2 [ "nombre" => "Diogo Guarnieri" "apellidos" => "Panazzolo" ] 1 => array:2 [ "nombre" => "Lucia Henriques Alves" "apellidos" => "da Silva" ] 2 => array:2 [ "nombre" => "Fátima Zely Garcia" "apellidos" => "de Almeida Cyrino" ] 3 => array:2 [ "nombre" => "Fernando Lencastre" "apellidos" => "Sicuro" ] 4 => array:2 [ "nombre" => "Luiz Guilherme" "apellidos" => "Kraemer-Aguiar" ] 5 => array:2 [ "nombre" => "Eliete" "apellidos" => "Bouskela" ] ] ] ] ] "idiomaDefecto" => "en" "EPUB" => "https://multimedia.elsevier.es/PublicationsMultimediaV1/item/epub/S1807593222020427?idApp=UINPBA00004N" "url" => "/18075932/0000006800000012/v1_202212011241/S1807593222020427/v1_202212011241/en/main.assets" ] "en" => array:19 [ "idiomaDefecto" => true "cabecera" => "<span class="elsevierStyleTextfn">BASIC RESEARCH</span>" "titulo" => "Biomechanical comparison of the four-strand cruciate and Strickland techniques in animal tendons" "tieneTextoCompleto" => true "paginas" => array:1 [ 0 => array:2 [ "paginaInicial" => "1543" "paginaFinal" => "1547" ] ] "autores" => array:1 [ 0 => array:4 [ "autoresLista" => "Raquel Bernardelli Iamaguchi, William Villani, Marcelo Rosa Rezende, Teng Hsiang Wei, Alvaro B Cho, Gustavo Bispo dos Santos, Rames Mattar" "autores" => array:7 [ 0 => array:4 [ "nombre" => "Raquel Bernardelli" "apellidos" => "Iamaguchi" "email" => array:1 [ 0 => "biraquel@bol.com.br" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "*" "identificador" => "cor1" ] ] ] 1 => array:2 [ "nombre" => "William" "apellidos" => "Villani" ] 2 => array:2 [ "nombre" => "Marcelo Rosa" "apellidos" => "Rezende" ] 3 => array:2 [ "nombre" => "Teng Hsiang" "apellidos" => "Wei" ] 4 => array:2 [ "nombre" => "Alvaro B" "apellidos" => "Cho" ] 5 => array:2 [ "nombre" => "Gustavo Bispo" "apellidos" => "dos Santos" ] 6 => array:3 [ "nombre" => "Rames" "apellidos" => "Mattar" "sufijo" => "Jr" ] ] "afiliaciones" => array:1 [ 0 => array:2 [ "entidad" => "Faculdade de Medicina da Universidade de São Paulo (USP), Institute of Orthopedics and Traumatology, São Paulo/SP, Brazil." "identificador" => "aff1" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor1" "etiqueta" => "*" "correspondencia" => "Tel.: 55 11 3021-4155" ] ] ] ] "resumenGrafico" => array:2 [ "original" => 0 "multimedia" => array:7 [ "identificador" => "fig3" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 572 "Ancho" => 742 "Tamanyo" => 14653 ] ] "descripcion" => array:1 [ "en" => "<p id="spara30" class="elsevierStyleSimplePara elsevierViewall">Maximum force to suture rupture.</p>" ] ] ] "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle60">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">Flexor tendon lesions have always been a challenge for hand surgeons. However, due to advances in materials and suture techniques, the functional results of flexor tendon tenorraphies have improved (<a class="elsevierStyleCrossRef" href="#bib1">1</a>,<a class="elsevierStyleCrossRef" href="#bib2">2</a>).</p><p id="para20" class="elsevierStylePara elsevierViewall">New suture techniques are designed to provide sufficient strength during early rehabilitation without increasing the incidence of premature suture rupture or the work required for flexion (<a class="elsevierStyleCrossRef" href="#bib3">3</a>). The strength of a flexor tendon repair is proportional to the number of suture strands that cross the repair site (<a class="elsevierStyleCrossRef" href="#bib1">1</a>,<a class="elsevierStyleCrossRef" href="#bib4">4</a>); however, this biomechanical advantage occurs at the expense of increased suture volume and decreased vascularity of the tendon, resulting in worse clinical outcomes, decreasing the incidence of adherence and increasing the requirement for secondary tenolysis (<a class="elsevierStyleCrossRef" href="#bib5">5</a>).</p><p id="para30" class="elsevierStylePara elsevierViewall">Moreover, increasing the number of suture strands prolongs the time of repair and increases the difficulty; consequently, many surgeons prefer four-strand sutures (<a class="elsevierStyleCrossRef" href="#bib5">5</a>,<a class="elsevierStyleCrossRef" href="#bib6">6</a>). Studies of four-strand sutures have reported good strength, but unequal loads can occur when two knots are used because the knot itself is a weak point of the suture (<a class="elsevierStyleCrossRef" href="#bib7">7</a>,<a class="elsevierStyleCrossRef" href="#bib8">8</a>).</p><p id="para40" class="elsevierStylePara elsevierViewall">In recent articles on suture techniques, the cruciate technique has provided good tensile strength and has required greater force for failure and for the formation of gaps, without increasing the operative times (<a class="elsevierStyleCrossRef" href="#bib6">6</a>,<a class="elsevierStyleCrossRef" href="#bib7">7</a>,<a class="elsevierStyleCrossRef" href="#bib9">9</a>)–(<a class="elsevierStyleCrossRef" href="#bib13">13</a>). The cruciate repair suture was first described by McLarney et al. (<a class="elsevierStyleCrossRef" href="#bib10">10</a>) and was considered the ideal technique by James W. Strickland, possessing the mechanical strength of a four-strand suture and technical simplicity of a two-strand suture (<a class="elsevierStyleCrossRef" href="#bib5">5</a>,<a class="elsevierStyleCrossRef" href="#bib12">12</a>). Although the cruciate technique provides better mechanical results <span class="elsevierStyleItalic">in vitro</span>, the Strickland technique remains one of the most widely used methods (<a class="elsevierStyleCrossRef" href="#bib14">14</a>).</p><p id="para50" class="elsevierStylePara elsevierViewall">With regard to completing tendon repairs, the circumferential epitendinous suture increases the strength of the tendon suture by 10% to 50% and reduces the gap between the stumps of the tendons (<a class="elsevierStyleCrossRef" href="#bib1">1</a>).</p><p id="para60" class="elsevierStylePara elsevierViewall">The objective of the present study was to compare different four-strand techniques, specifically the cruciate and Strickland sutures, both of which are reinforced by a continuous epitendinous suture in terms of the maximum load, maximum deformation, time elapsed until rupture and the stiffness of the sutures.</p></span><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle70">MATERIALS AND METHODS</span><p id="para70" class="elsevierStylePara elsevierViewall">Nineteen male and female New Zealand albino rabbits, between 3,500 g and 3,900 g, were acquired from the vivarium of the Faculty of Medicine, University of São Paulo, and were maintained in a laboratory for musculoskeletal research. The University of São Paulo Ethics Committee for Animal Resources approved this animal study.</p><p id="para80" class="elsevierStylePara elsevierViewall">The animals were euthanized with sodium thiopental at 75 mg/kg intraperitoneally, as per instructions from the Brazilian College of Animal Experimentation (COBEA, 2007). Both Achilles tendons from each rabbit were harvested, and the skin was sutured. The tendons were prepared immediately for testing. The animals were disposed of at the Center of Biological Material, University of São Paulo.</p><p id="para90" class="elsevierStylePara elsevierViewall">The tendons were divided into two groups, each consisting of 19 experiments. Each tendon was randomly repaired with one of the techniques: Group 1 received a Strickland suture (<a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a>); and Group 2 received a cruciate repair suture (<a class="elsevierStyleCrossRef" href="#fig2">Figure 2</a>). Both groups were reinforced with a circumferential, epitendinous, simple running suture.</p><elsevierMultimedia ident="fig1"></elsevierMultimedia><elsevierMultimedia ident="fig2"></elsevierMultimedia><p id="para100" class="elsevierStylePara elsevierViewall">Each tendon was sectioned into two parts with a number 15 scalpel using a straight transverse cut and was sutured according to the randomization of surgical techniques with a 4–0 Nylon suture and with the core suture placed 7 mm from the cut edge of the tendon. The circumferential, epitendinous, simple running suture was held with 6–0 Nylon and a core suture purchase of 2 mm.</p><p id="para110" class="elsevierStylePara elsevierViewall">The average cross-sectional volume of the tendons in Group 1 was 15.87 mm<span class="elsevierStyleSup">2</span><span class="elsevierStyleItalic">versus</span> 15.65 mm<span class="elsevierStyleSup">2</span> in Group 2. The groups were homogeneous with regard to volume.</p><p id="para120" class="elsevierStylePara elsevierViewall">The repaired tendons were tested for failure by constant progressive distraction using a Kratos® universal testing machine, equipped with a load cell of 100 kgf and adjusted to a range of 10 kgf (accuracy of 10 gf). The tendon was fixed in the testing machine using two rectangular grasps with a trapezoidal profile; the distal end of the tendon was attached to a fixed section of the machine, and the proximal end was connected to the load cell in the movable part of the machine. The measurement system consisted of one mechanical linear actuator, and the load transducer connected to the proximal end of the Achilles tendon was connected to a computer, using the ADS2000 Lynx® data acquisition system. The force and displacement data measured by the system were registered.</p><p id="para130" class="elsevierStylePara elsevierViewall">To measure the gap between the cut edges of the tendon during mechanical testing, the tests were synchronized with a Sony DCR-HC26 digital camera. A two-point template with known distance was placed beside the tendon as a reference for the gap. Maximum deformation was calculated by setting the gap between the cut edges of the tendons at the time of suture rupture, measured in millimeters. The gap at the repair site was measured using a program that automatically identifies, calculates and records the gap in millimeters, based on the distance between points on the template as a reference.</p><p id="para140" class="elsevierStylePara elsevierViewall">To ensure synchronization between the data from the machine-based tests and measurements from the computer, a light-emitting diode (LED) was placed in the visual field of a digital camera that lit up at the same instant that the computer started to acquire data from the testing machine. This synchronization of equipment allowed us to calculate in seconds the maximum time elapsed until the moment of suture rupture.</p><p id="para150" class="elsevierStylePara elsevierViewall">Based on data from the testing machine, a computer program calculated the maximum load at the time of suture rupture for each test, and the stiffness of the suture was obtained by dividing the maximum load by the maximum gap in Newtons per millimeter.</p><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle80">Ethics</span><p id="para160" class="elsevierStylePara elsevierViewall">The University of São Paulo Ethics Committee for Animal Resources approved this animal study.</p></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle90">Statistical analysis</span><p id="para170" class="elsevierStylePara elsevierViewall">In our statistical analysis, the data were parametric and unpaired. The sample distribution was normal, as assessed by the Kolmogorov-Smirnov test, and the variance was homogeneous by Levene's test. Student's t-test was employed for quantitative variables. Descriptive and inferential analyses were performed with SPSS software, version 17.0 for Windows.</p></span></span><span id="cesec50" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle100">RESULTS</span><p id="para180" class="elsevierStylePara elsevierViewall">Group 1 underwent tenorrhaphy by the Strickland method, as follows: the average maximum deformation or gapping of the cut edges of the tendons at the time of suture rupture was 12.68 mm (median 13.05 mm, SD 2.86 mm). Group 2, which underwent cruciate tenorrhaphy, had an average value of 11.74 mm (median 11.51 mm, SD 3.16 mm).</p><p id="para190" class="elsevierStylePara elsevierViewall">In Group 1, the average time that elapsed until the moment of suture rupture was 44.9 seconds (median 46.0 seconds, SD 9.8 seconds), compared with 40.2 seconds in Group 2 (median 38.9 seconds, SD 10.4 seconds).</p><p id="para200" class="elsevierStylePara elsevierViewall">In Group 1, the average maximum force at the time of suture rupture was 34.83 N (median 35.15 N, SD 10.27 N) <span class="elsevierStyleItalic">vs.</span> 35.13 N in Group 2 (median 35.44 N, SD 12.85 N).</p><p id="para210" class="elsevierStylePara elsevierViewall">The mean stiffness in Group 1 was 4.31 N/mm (median 3.92 N/mm, SD 1.35 N/mm), compared with 5.16 N/mm in Group 2 (median 4.87 N/mm, SD 1.45 N/mm).</p><p id="para220" class="elsevierStylePara elsevierViewall">In our statistical analysis, by Student's t-test (2 × 2 table), none of the parameters were statistically significant. The median maximum force that was required for suture rupture and the stiffness of the sutures were greater with cruciate repair (<span class="elsevierStyleItalic">p</span> = 0.94). The Strickland technique resulted in higher median maximum deformation with a wider final gap (<span class="elsevierStyleItalic">p</span> = 0.36) and a longer time elapsing until the moment of suture rupture (<span class="elsevierStyleItalic">p</span> = 0.15). Boxplots for these values were generated for the samples (<a class="elsevierStyleCrossRefs" href="#fig3">Figures 3 and 4</a>).</p><elsevierMultimedia ident="fig3"></elsevierMultimedia><elsevierMultimedia ident="fig4"></elsevierMultimedia></span><span id="cesec60" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle110">DISCUSSION</span><p id="para230" class="elsevierStylePara elsevierViewall">Various tendon sutures have been compared with regard to their techniques, materials and use of epitendinous sutures. The ideal suture, according to Strickland (<a class="elsevierStyleCrossRef" href="#bib1">1</a>), must: 1) be easy to perform; 2) be reliable; 3) result in homogeneous coaptation of the cut edges of the tendon; 4) create a lower gap in the suture zone; 5) provide less interference with tendon vascularity; and 6) provide sufficient strength to facilitate early rehabilitation.</p><p id="para240" class="elsevierStylePara elsevierViewall">The ideal suture can be achieved through techniques with a higher number of strands that cross the repair site, which, however, can also lead to increased technical difficulty and more time to perform (<a class="elsevierStyleCrossRef" href="#bib13">13</a>). Moreover, tendons can be injured, with impairments to vascularization, using techniques that use six or more strands (<a class="elsevierStyleCrossRef" href="#bib1">1</a>). The most widely used techniques are the four- and six-strand methods, which are considered superior to two-strand techniques (<a class="elsevierStyleCrossRef" href="#bib6">6</a>,<a class="elsevierStyleCrossRef" href="#bib15">15</a>).</p><p id="para250" class="elsevierStylePara elsevierViewall">The epitendinous suture increases the resistance of the tendon by 10% to 50% and reduces the gap at the repair site of the tendon. In the present study, epitendinous suturing was performed in both groups, but its presence in mechanical tests hindered the visualization and evaluation of gap formation at the repair site, thereby generating a homogeneous suture and increasing early suture resistance (<a class="elsevierStyleCrossRef" href="#bib1">1</a>).</p><p id="para260" class="elsevierStylePara elsevierViewall">Savage (<a class="elsevierStyleCrossRef" href="#bib16">16</a>) suggested that the ideal suture should withstand a force at the repair site that is five times greater than the force necessary to actively move the tendon without resistance. Initial studies of the cruciate technique (<a class="elsevierStyleCrossRef" href="#bib17">17</a>) demonstrated that it is capable of supporting strength beyond the physiological requirement for active movement.</p><p id="para270" class="elsevierStylePara elsevierViewall">In our study, both sutures attained a strength that exceeded 30 N, sufficient to allow for active rehabilitation protocols, per Viinikiainen et al. (<a class="elsevierStyleCrossRef" href="#bib18">18</a>,<a class="elsevierStyleCrossRef" href="#bib19">19</a>). Because the tests were performed in rabbit tendons <span class="elsevierStyleItalic">in vitro</span>, it was not possible to compare the values of human flexor tendons in the suture tests; these values should approximate one another, although rabbit tendons have less mechanical resistance and smaller diameters.</p><p id="para280" class="elsevierStylePara elsevierViewall">Another limitation of this experimental study, similar to all <span class="elsevierStyleItalic">in vitro</span> studies, was the inability to study the effects of postoperative edema, tendon resistance and gap formation during active movement (<a class="elsevierStyleCrossRef" href="#bib17">17</a>).</p><p id="para290" class="elsevierStylePara elsevierViewall">In this study, we also observed that the cruciate repair suture technique was easier to perform and had a lower volume at the repair site, with one suture knot, and a more homogeneous suture, which was consistent with the literature (<a class="elsevierStyleCrossRef" href="#bib6">6</a>,<a class="elsevierStyleCrossRef" href="#bib7">7</a>,<a class="elsevierStyleCrossRef" href="#bib10">10</a>). During the tests, the cruciate repair suture formed a more homogeneous graph of deformation <span class="elsevierStyleItalic">versus</span> resistance, whereas the Strickland suture had one of its knots rupture and rapidly lose resistance, which might be attributed to the difficulty in creating equal tension between the Kessler suture and the U suture of the Strickland technique.</p><p id="para300" class="elsevierStylePara elsevierViewall">Four-strand cruciate suture techniques are easier to perform, provide less interference with tendon gliding and are sufficiently strong for an early active motion protocol (<a class="elsevierStyleCrossRef" href="#bib15">15</a>,<a class="elsevierStyleCrossRef" href="#bib17">17</a>); in our study, however, there were no significant differences between the Strickland and cruciate repair techniques regarding the maximum load required to rupture the suture, the maximum deformation at failure or the stiffness, which can be explained by the number of tests that were performed with each technique. The cruciate repair suture also had a lower tendency toward gap formation, which will be evaluated in future studies.</p><p id="para310" class="elsevierStylePara elsevierViewall">Croog et al. (<a class="elsevierStyleCrossRef" href="#bib6">6</a>) studied various configurations of the cruciate repair suture and noted that the cross lock increased the overall resistance, as well as the resistance to gap formation (<a class="elsevierStyleCrossRef" href="#bib20">20</a>). Based on our observation that the simple cruciate repair suture had similar resistance compared with the Strickland technique, we recommend using the cross lock cruciate repair suture, which improves suture strength without significantly increasing the technical difficulty.</p><p id="para320" class="elsevierStylePara elsevierViewall">Hand surgeons should aim to simplify tendon sutures and to maintain the suture strength without increasing the technical difficulty (<a class="elsevierStyleCrossRef" href="#bib21">21</a>). Thus, we advocate the cruciate repair suture technique, which yielded results comparable to the Strickland method in our study, in addition to its reported advantages. The technical benefits of the cruciate repair suture under clinical conditions could generate a lower coefficient of friction, thereby reducing failures, which we did not address in our experiments (<a class="elsevierStyleCrossRef" href="#bib5">5</a>,<a class="elsevierStyleCrossRef" href="#bib6">6</a>,<a class="elsevierStyleCrossRef" href="#bib7">7</a>,<a class="elsevierStyleCrossRef" href="#bib9">9</a>,<a class="elsevierStyleCrossRef" href="#bib10">10</a>).</p><p id="para330" class="elsevierStylePara elsevierViewall">The cruciate repair suture is similar to the Strickland method with regard to the maximum load and the stiffness to suture rupture. Further studies should be conducted to investigate the clinical results of these techniques.</p></span><span id="cesec70" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle120">ACKNOWLEDGMENTS</span><p id="para340" class="elsevierStylePara elsevierViewall">The authors thank Cesar A. M. Pereira for helping to perform the mechanical tests in the Laboratory of Musculoskeletal Research (University of São Paulo).</p></span></span>" "textoCompletoSecciones" => array:1 [ "secciones" => array:7 [ 0 => array:2 [ "identificador" => "xpalclavsec1582069" "titulo" => "KEYWORDS" ] 1 => array:2 [ "identificador" => "cesec10" "titulo" => "INTRODUCTION" ] 2 => array:3 [ "identificador" => "cesec20" "titulo" => "MATERIALS AND METHODS" "secciones" => array:2 [ 0 => array:2 [ "identificador" => "cesec30" "titulo" => "Ethics" ] 1 => array:2 [ "identificador" => "cesec40" "titulo" => "Statistical analysis" ] ] ] 3 => array:2 [ "identificador" => "cesec50" "titulo" => "RESULTS" ] 4 => array:2 [ "identificador" => "cesec60" "titulo" => "DISCUSSION" ] 5 => array:2 [ "identificador" => "cesec70" "titulo" => "ACKNOWLEDGMENTS" ] 6 => array:1 [ "titulo" => "REFERENCES" ] ] ] "pdfFichero" => "main.pdf" "tienePdf" => true "fechaRecibido" => "2013-02-12" "fechaAceptado" => "2013-06-20" "PalabrasClave" => array:1 [ "en" => array:1 [ 0 => array:4 [ "clase" => "keyword" "titulo" => "KEYWORDS" "identificador" => "xpalclavsec1582069" "palabras" => array:3 [ 0 => "Tendon Repair" 1 => "Animal Experimentation" 2 => "Flexor Tendon" ] ] ] ] "tieneResumen" => true "resumen" => array:1 [ "en" => array:2 [ "resumen" => "<span id="ceabs10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle10">OBJECTIVE:</span><p id="spara50" class="elsevierStyleSimplePara elsevierViewall">The objective of this study was to compare two four-strand techniques: the traditional Strickland and cruciate techniques.</p></span> <span id="ceabs20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">METHODS:</span><p id="spara60" class="elsevierStyleSimplePara elsevierViewall">Thirty-eight Achilles tendons were removed from 19 rabbits and were assigned to two groups based on suture technique (Group 1, Strickland suture; Group 2, cruciate repair). The sutured tendons were subjected to constant progressive distraction using a universal testing machine (Kratos®). Based on data from the instrument, which were synchronized with the visualized gap at the suture site and at the time of suture rupture, the following data were obtained: maximum load to rupture, maximum deformation or gap, time elapsed until failure, and stiffness.</p></span> <span id="ceabs30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">RESULTS:</span><p id="spara70" class="elsevierStyleSimplePara elsevierViewall">In the statistical analysis, the data were parametric and unpaired, and by Kolmogorov-Smirnov test, the sample distribution was normal. By Student's t-test, there was no significant difference in any of the data: the cruciate repair sutures had slightly better mean stiffness, and the Strickland sutures had longer time-elapsed suture ruptures and higher average maximum deformation.</p></span> <span id="ceabs40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">CONCLUSIONS:</span><p id="spara80" class="elsevierStyleSimplePara elsevierViewall">The cruciate and Strickland techniques for flexor tendon sutures have similar mechanical characteristics <span class="elsevierStyleItalic">in vitro</span>.</p></span>" "secciones" => array:4 [ 0 => array:2 [ "identificador" => "ceabs10" "titulo" => "OBJECTIVE:" ] 1 => array:2 [ "identificador" => "ceabs20" "titulo" => "METHODS:" ] 2 => array:2 [ "identificador" => "ceabs30" "titulo" => "RESULTS:" ] 3 => array:2 [ "identificador" => "ceabs40" "titulo" => "CONCLUSIONS:" ] ] ] ] "NotaPie" => array:1 [ 0 => array:1 [ "nota" => "<p class="elsevierStyleNotepara" id="cenpara10">Iamaguchi RB contributed to the study design, data collection, assessment of the results, statistical analyses and manuscript preparation. Villani W and Santos GB contributed to the data collection. Rezende MR, Wei TH and Cho AB were responsible for the critical revision. Mattar R supervised the study.</p> <p class="elsevierStyleNotepara" id="cenpara20">No potential conflict of interest was reported.</p>" ] ] "multimedia" => array:4 [ 0 => array:7 [ "identificador" => "fig1" "etiqueta" => "Figure 1" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr1.jpeg" "Alto" => 256 "Ancho" => 664 "Tamanyo" => 13496 ] ] "descripcion" => array:1 [ "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">Strickland method.</p>" ] ] 1 => array:7 [ "identificador" => "fig2" "etiqueta" => "Figure 2" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr2.jpeg" "Alto" => 257 "Ancho" => 664 "Tamanyo" => 16321 ] ] "descripcion" => array:1 [ "en" => "<p id="spara20" class="elsevierStyleSimplePara elsevierViewall">Cruciate repair suture.</p>" ] ] 2 => array:7 [ "identificador" => "fig3" "etiqueta" => "Figure 3" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr3.jpeg" "Alto" => 572 "Ancho" => 742 "Tamanyo" => 14653 ] ] "descripcion" => array:1 [ "en" => "<p id="spara30" class="elsevierStyleSimplePara elsevierViewall">Maximum force to suture rupture.</p>" ] ] 3 => array:7 [ "identificador" => "fig4" "etiqueta" => "Figure 4" "tipo" => "MULTIMEDIAFIGURA" "mostrarFloat" => true "mostrarDisplay" => false "figura" => array:1 [ 0 => array:4 [ "imagen" => "gr4.jpeg" "Alto" => 568 "Ancho" => 742 "Tamanyo" => 12424 ] ] "descripcion" => array:1 [ "en" => "<p id="spara40" class="elsevierStyleSimplePara elsevierViewall">Stiffness of the groups.</p>" ] ] ] "bibliografia" => array:2 [ "titulo" => "REFERENCES" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "cebibsec10" "bibliografiaReferencia" => array:21 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:2 [ "contribucion" => array:1 [ 0 => array:2 [ "titulo" => "Flexor Tendon Injuries: I. 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Year/Month | Html | Total | |
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