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Allograft tissue

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https://www.readbyqxmd.com/read/29352626/differences-between-sexes-in-the-standard-and-advanced-dimensioning-of-lateral-meniscal-allografts
#1
Patrycja Mickiewicz, Michał Walczak, Michał Łaszczyca, Damian Kusz, Zygmunt Wróbel
BACKGROUND: There are many different methods of meniscal allograft measurements, which depend on individual tissue bank procedures. Due to the lack of a standardised method of dimensioning, measurement results may vary between individual cases. Consequently, allograft may be mismatched to the patient's knee anatomy. The purpose of this study was to measure four meniscal dimensions - two standard and two specific - and then compare them between sexes. METHODS: Fourteen cadaveric lateral menisci (seven male and seven female) were scanned using a microtomography scanner...
January 15, 2018: Knee
https://www.readbyqxmd.com/read/29351870/de-novo-generation-in-an-in-vivo-rat-model-and-biomechanical-characterization-of-autologous-transplants-for-ligament-and-tendon-reconstruction
#2
Marc Soubeyrand, Elisabeth Laemmel, Nathalie Maurel, Amadou Diop, Thierry Lazure, Jacques Duranteau, Eric Vicaut
BACKGROUND: Surgical reconstruction of ligaments and tendons is frequently required in clinical practice. The commonly used autografts, allografts, or synthetic transplants present limitations in terms of availability, biocompatibility, cost, and mechanical properties that tissue bioengineering aims to overcome. It classically combines an exogenous extracellular matrix with cells, but this approach remains complex and expensive. Using a rat model, we tested a new bioengineering strategy for the in vivo and de novo generation of autologous grafts without the addition of extracellular matrix or cells, and analyzed their biomechanical and structural properties...
December 14, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/29348999/open-repair-of-quadriceps-tendon-with-suture-anchors-and-semitendinosus-tendon-allograft-augmentation
#3
Jorge Chahla, Nicholas N DePhillipo, Mark E Cinque, Nicholas I Kennedy, George F Lebus, Filippo Familiari, Gilbert Moatshe, Robert F LaPrade
Quadriceps tendinopathy in an increasingly recognized diagnosis can lead to quadriceps tendon rupture, especially in the older population. It can be caused by repeated micro trauma or also predisposed by systemic diseases such as diabetes mellitus and connective tissue disorders that can in turn lead to extensor mechanism deficits. Although a trial of conservative treatment is advocated, operative treatment should be performed in cases of persistent pain, extension deficit, or complete rupture of the tendon...
December 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29345755/expression-of-hepatic-progenitor-cell-markers-in-acute-cellular-rejection-of-liver-allografts-an-immunohistochemical-study
#4
Regina Cheuk-Lam Lo, Kristy Kwan-Shuen Chan, Carmen Oi-Ning Leung, Irene Oi-Lin Ng
BACKGROUND: Hepatic progenitor cells (HPC) are induced following liver injury to facilitate regeneration. Acute cellular rejection (ACR) is a common complication after liver transplantation as a result of immune-mediated liver injury. In this study we characterized HPC phenotype in liver allograft biopsy with ACR. We also explored the correlation between expression HPC immunophenotype and clinicopathological parameters. METHODS: Forty-four liver allograft biopsies performed between 2008-2016 in a single center with histologically proven ACR were examined for immunohistochemical expression of HPC markers CK19 and Sox9...
January 18, 2018: Clinical Transplantation
https://www.readbyqxmd.com/read/29338761/is-total-femoral-replacement-for-non-oncologic-and-oncologic-indications-a-safe-procedure-in-limb-preservation-surgery-a-single-center-experience-of-22-cases
#5
Andreas Toepfer, Norbert Harrasser, Isabel Petzschner, Florian Pohlig, Ulrich Lenze, Ludger Gerdesmeyer, Ruediger von Eisenhart-Rothe, Heinrich Mühlhofer, Christian Suren
BACKGROUND: Several surgical options for the reconstruction of massive bone defects have been described and include biologic methods with autografts and allografts, and the use of tumor endoprostheses (total femoral replacement, TFR). Several types of modular TFR are available, but nevertheless unpredictable outcomes and high complication rates have been described from most authors. The present study aims to compare results after TFR performed with modular total femur prosthesis MML (Fa...
January 16, 2018: European Journal of Medical Research
https://www.readbyqxmd.com/read/29338185/injectable-and-thermo-sensitive-hydrogel-and-pdlla-electrospun-nanofiber-membrane-composites-for-guided-spinal-fusion
#6
Ying Qu, BeiYu Wang, Bingyang Chu, Chenlu Liu, Xin Rong, Hua Chen, JinRong Peng, Zhiyong Qian
Spinal fusion is the classic treatment to achieve spinal stability for the treatment of the spinal disease. Generally, spinal fusion still has to combine a certain of bone matrix for promoting bone formation to achieve the desired fusion effect based on the surgery, including the traditional bone matrix, such as the autologous bone, allografts and xenografts. Nevertheless, some problems still existed such as the immunogenic problems, the secondary wound, and pathogenic transfer and so on. Here the injectable thermosensitive hydrogel could substitute to avoid the problems as a potential biological scaffold for tissue engineering...
January 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29338084/importance-of-b-cells-to-development-of-tregs-and-prolongation-of-tissue-allograft-survival-in-recipients-receiving-autologous-bone-marrow-transplantation
#7
Reginald M Gorczynski, Kaveh Farrokhi, Christopher Gorczynski, Hassan Sadozai, Fang Zhu, Ismat Khatri
We previously showed that congenic bone marrow transplantation (BMTx) post myeloablation augmented tissue allograft survival in association with increased Tregs of both host and bone marrow donor origin. Regulatory B cells (Bregs) can also modulate T cell immunity and B cells may be implicated in the development of Tregs. Accordingly, we explored the effect of B cell depletion in vivo on augmented graft survival post BMTx. C57BL/6 mice received BALB/c skin allografts followed 7d later by myeloablation using cyclophosphamide and busulphan...
January 16, 2018: Immunology
https://www.readbyqxmd.com/read/29330711/boosting-tendon-repair-interplay-of-cells-growth-factors-and-scaffold-free-and-gel-based-carriers
#8
REVIEW
Zexing Yan, Heyong Yin, Michael Nerlich, Christian G Pfeifer, Denitsa Docheva
BACKGROUND: Tendons are dense connective tissues and critical components for the integrity and function of the musculoskeletal system. Tendons connect bone to muscle and transmit forces on which locomotion entirely depends. Due to trauma, overuse and age-related degeneration, many people suffer from acute or chronic tendon injuries. Owing to their hypovascularity and hypocellularity, tendinopathies remain a substantial challenge for both clinicians and researchers. Surgical treatment includes suture or transplantation of autograft, allograft or xenograft, and these serve as the most common technique for rescuing tendon injuries...
January 5, 2018: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/29328886/osteochondral-graft-size-is-significantly-associated-with-increased-force-and-decreased-chondrocyte-viability
#9
Brian E Walczak, Matthew S Nies, Darrin J Trask, Scott Hetzel, Patrick J Roney, Matthew W Squire, Geoffrey S Baer
BACKGROUND: Insertion force has been shown to significantly reduce chondrocyte viability during osteochondral allograft transplantation. How graft size influences the required insertion force and chondrocyte viability has yet to be determined. Hypothesis/Purpose: The purpose was to characterize how graft size influences insertion force requirements and chondrocyte viability during osteochondral transplantation. The hypothesis was that larger grafts would require greater force and reduce chondrocyte viability...
January 1, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29327719/the-histomorphological-spectrum-of-restrictive-chronic-lung-allograft-dysfunction-and-implications-for-prognosis
#10
Jan H von der Thüsen, Elly Vandermeulen, Robin Vos, Birgit Weynand, Erik K Verbeken, Stijn E Verleden
Chronic lung allograft dysfunction continues to be the main contributor to poor long-term allograft survival after lung transplantation. The restrictive phenotype of chronic lung allograft dysfunction carries a particularly poor prognosis. Little is known about the pathogenetic mechanisms involved in restrictive chronic lung allograft dysfunction. In this study, we performed histomorphological and immunohistochemical analysis of restrictive chronic lung allograft dysfunction lungs. Explant lung tissue from 21 restrictive chronic lung allograft dysfunction patients was collected and histopathologic patterns of rejection, fibrosis and vascular changes were scored after routine histochemical stains and additional immunohistochemistry for endothelial markers and C4d...
January 12, 2018: Modern Pathology: An Official Journal of the United States and Canadian Academy of Pathology, Inc
https://www.readbyqxmd.com/read/29323942/comparison-of-juvenile-allogenous-articular-cartilage-and-bone-marrow-aspirate-concentrate-versus-microfracture-with-and-without-bone-marrow-aspirate-concentrate-in-arthroscopic-treatment-of-talar-osteochondral-lesions
#11
Sydney C Karnovsky, Bridget DeSandis, Amgad M Haleem, Carolyn M Sofka, Martin O'Malley, Mark C Drakos
BACKGROUND: The purpose of this study was to compare the functional and radiographic outcomes of patients who received juvenile allogenic chondrocyte implantation with autologous bone marrow aspirate (JACI-BMAC) for treatment of talar osteochondral lesions with those of patients who underwent microfracture (MF). METHODS: A total of 30 patients who underwent MF and 20 who received DeNovo NT for JACI-BMAC treatment between 2006 and 2014 were included. Additionally, 17 MF patients received supplemental BMAC treatment...
January 1, 2018: Foot & Ankle International
https://www.readbyqxmd.com/read/29319735/tibial-tunnel-enlargement-and-joint-instability-after-anterior-cruciate-ligament-reconstruction-a-prospective-comparison-between-autograft-and-allograft
#12
Qiang Zhang, Guangliang Hao, Mingyong Gu, Xuecheng Cao
PURPOSE: To investigate tibial tunnel widening and knee instability after ACL reconstruction with hamstring autograft or irradiated soft tissue allograft. METHODS: Eight-two patients were divided into two groups: autograft group and allograft group. Radiographic and clinical evaluations were performed. RESULTS: Seventy patients were followed up with median of 36.3 months (range 36-38 months). Tibial tunnel widening was at or greater than 30% for nine patients in the autograft group and 15 patients in the allograft group (P = 0...
December 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/29319572/vascularized-composite-allotransplantation-of-the-elbow-joint-a-cadaveric-study
#13
Mitchell A Pet, Angelo B Lipira, Yusha Liu, Dennis Kao, Jason H Ko
BACKGROUND: Surgical options for the unreconstructable elbow are limited to arthrodesis, total arthroplasty, or osteoarticular allograft reconstruction. Each of these options is limited by severe functional impairment and/or high complication rates. Vascularized allotransplantation of the elbow joint has the potential to mitigate these complications. In this study, we describe our technique for harvesting the elbow for vascularized joint transplantation and demonstrate the flap's vascularity using contrast angiography...
January 9, 2018: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/29318178/outcomes-after-dermal-allograft-reconstruction-of-chronic-or-subacute-pectoralis-major-tendon-ruptures
#14
Julie A Neumann, Christopher M Klein, Carola F van Eck, Hithem Rahmi, John M Itamura
Background: Avoiding delay in the surgical management of pectoralis major (PM) ruptures optimizes outcomes. However, this is not always possible, and when a tear becomes chronic or when a subacute tear has poor tissue quality, a graft can facilitate reconstruction. Purpose: The primary aim was to evaluate the clinical outcomes of PM reconstruction with dermal allograft augmentation for chronic tears or for subacute tears with poor tissue quality. A second aim was to determine patient and surgical factors affecting outcome...
January 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29317260/growth-factor-delivery-strategies-for-rotator-cuff-repair-and-regeneration
#15
Anupama Prabhath, Varadraj N Vernekar, Enid Sanchez, Cato T Laurencin
The high incidence of degenerative tears and prevalence of retears (20-95%) after surgical repair makes rotator cuff injuries a significant health problem. This high retear rate is attributed to the failure of the repaired tissue to regenerate the native tendon-to-bone insertion (enthesis). Biological augmentation of surgical repair such as autografts, allografts, and xenografts are confounded by donor site morbidity, immunogenicity, and disease transmission, respectively. In contrast, these risks may be alleviated via growth factor therapy, which can actively influence the healing environment to promote functional repair...
January 6, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29316256/immunosuppressive-effect-of-the-gut-microbiome-altered-by-high-dose-tacrolimus-in-mice
#16
Z Zhang, L Liu, H Tang, W Jiao, S Zeng, Y Xu, Q Zhang, Z Sun, A Mukherjee, X Zhang, X Hu
The alterations induced in gut microbiota by tacrolimus may affect immune function and organ transplantation. Mice were treated with a high-dose of tacrolimus for 14 days. The fecal microbiota were analyzed by pyrosequencing the 16S rRNA genes, and the effect on metabolism was predicted using the sequence data. The subgroups of T cells in the serum, gut-associated lymphoid tissue and draining lymph nodes were determined by flow cytometry. Tacrolimus treatment significantly altered the relative abundance of Allobaculum, Bacteroides and Lactobacillus and CD4+ CD25hi FoxP3+ regulatory T-cells in the colonic mucosa and the circulation...
January 9, 2018: American Journal of Transplantation
https://www.readbyqxmd.com/read/29311365/simultaneous-recognition-of-allogeneic-mhc-and-cognate-autoantigen-by-autoreactive-t-cells-in-transplant-rejection
#17
Adam L Burrack, Laurie G Landry, Janet Siebert, Marilyne Coulombe, Ronald G Gill, Maki Nakayama
The autoimmune condition is a primary obstacle to inducing tolerance in type 1 diabetes patients receiving allogeneic pancreas transplants. It is unknown how autoreactive T cells that recognize self-MHC molecules contribute to MHC-disparate allograft rejection. In this report, we show the presence and accumulation of dual-reactive, that is autoreactive and alloreactive, T cells in C3H islet allografts that were transplanted into autoimmune diabetic NOD mice. Using high-throughput sequencing, we discovered that T cells prevalent in allografts share identical TCRs with autoreactive T cells present in pancreatic islets...
January 8, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29306095/effect-of-polybrominated-diphenyl-ether-congeners-on-placental-cytokine-production
#18
Yuko Arita, Corinne Yeh, Theodosia Thoma, Darios Getahun, Ramkumar Menon, Morgan R Peltier
Polybrominated diphenyl ethers (PBDEs) are pollutants that may increase the risk of preterm birth. In previous studies, we found that a mixture of PBDEs altered the expression of biomarkers for preterm birth by the placenta. However, there are 209 different PBDE congeners with different tissue distributions. How these different congeners may alter the production of immunomodulators by the placenta that help to maintain the survival of the fetal allograft is unclear. Therefore, we compared the effects 5 common congeners on basal and bacteria-stimulated cytokine production by the placenta...
December 21, 2017: Journal of Reproductive Immunology
https://www.readbyqxmd.com/read/29305041/arthroscopic-treatment-of-osteochondral-lesions-of-the-talus-using-juvenile-articular-cartilage-allograft-and-autologous-bone-marrow-aspirate-concentration
#19
Bridget A DeSandis, Amgad M Haleem, Carolyn M Sofka, Martin J O'Malley, Mark C Drakos
Juvenile allogenic chondrocyte implantation (JACI; DeNovo NT Natural Tissue Graft®; Zimmer, Warsaw, IN) with autologous bone marrow aspirate concentrate (BMAC) is a relatively new all-arthroscopic procedure for treating critical-size osteochondral lesions (OCLs) of the talus. Few studies have investigated the clinical and radiographic outcomes of this procedure. We collected the clinical and radiographic outcomes of patients who had undergone JACI-BMAC for talar OCLs to assess treatment efficacy and cartilage repair tissue quality using magnetic resonance imaging (MRI)...
January 2, 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/29304972/editorial-commentary-adult-stem-cell-potential-to-enhance-healing-of-the-anterior-cruciate-ligament
#20
EDITORIAL
Monique C Chambers, Freddie H Fu
Even with the most accurate individualized, anatomic approach to anterior cruciate ligament (ACL) reconstruction, the potential for graft failure still exists, with reported retear rates as low as 5%, and even higher in female athletes or patients reconstructed with allograft. ACL graft healing is dependent on several factors, including anatomic placement, appropriate graft choice, proper technique, recovery time, and the biological environment of nature. If the double-bundle concept is followed and individualized for each patient's anatomic morphology, the ACL will biologically reform...
January 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
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