• Childhood Kidney Diseases
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• 제12권1호
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• pp.23-29
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• 2008

Kidney allograft transplantation is the most effective method of renal replacement for end stage renal disease patients. Still, it is another kind of 'disease', requiring immunosuppression to keep the allograft from rejection(allograft immune reaction). Immune system of the allograft recipient recognizes the graft as a 'pathogen (foreign or danger)', and the allograft-recognizing commanderin-chief of adaptive immune system, T cell, recruits all the components of immune system for attacking the graft. Proper activation and proliferation of T cell require signals from recognizing proper epitope(processed antigen by antigen presenting cell) via T cell receptor, costimulatory stimuli, and cytokines(IL-2). Thus, most of the immunosuppressive agents suppress the process of T cell activation and proliferation.

• Journal of Veterinary Science
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• 제25권2호
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• pp.22.1-22.15
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• 2024

Background: Achilles tendon is composed of dense connective tissue and is one of the largest tendons in the body. In veterinary medicine, acute ruptures are associated with impact injury or sharp trauma. Healing of the ruptured tendon is challenging because of poor blood and nerve supply as well as the residual cell population. Platelet-rich plasma (PRP) contains numerous bioactive agents and growth factors and has been utilized to promote healing in bone, soft tissue, and tendons. Objective: The purpose of this study was to evaluate the healing effect of PRP injected into the surrounding fascia of the Achilles tendon after allograft in rabbits. Methods: Donor rabbits (n = 8) were anesthetized and 16 lateral gastrocnemius tendons were fully transected bilaterally. Transected tendons were decellularized and stored at -80℃ prior to allograft. The allograft was placed on the partially transected medial gastrocnemius tendon in the left hindlimb of 16 rabbits. The allograft PRP group (n = 8) had 0.3 mL of PRP administered in the tendon and the allograft control group (n = 8) did not receive any treatment. After 8 weeks, rabbits were euthanatized and allograft tendons were transected for macroscopic, biomechanical, and histological assessment. Results: The allograft PRP group exhibited superior macroscopic assessment scores, greater tensile strength, and a histologically enhanced healing process compared to those in the allograft control group. Conclusions: Our results suggest administration of PRP on an allograft tendon has a positive effect on the healing process in a ruptured Achilles tendon.

• Korean Journal of Radiology
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• 제20권6호
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• pp.894-908
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• 2019

Kidney transplantation is the treatment of choice for patients with end-stage renal disease, as it extends survival and increases quality of life in these patients. However, chronic allograft injury continues to be a major problem, and leads to eventual graft loss. Early detection of allograft injury is essential for guiding appropriate intervention to delay or prevent irreversible damage. Several advanced MRI techniques can offer some important information regarding functional changes such as perfusion, diffusion, structural complexity, as well as oxygenation and fibrosis. This review highlights the potential of multiparametric MRI for noninvasive and comprehensive assessment of renal allograft injury.

• Journal of Chest Surgery
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• 제27권1호
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• pp.1-8
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• 1994

Allograft cardiac valves have been used for over 30 years to replace diseased cardiac valves, reconstruct right or left ventricular outflow tract. With increasing its requirement, the establishment of a viable bank capable of maintaining the viability of graft over a prolonged period would be desirable. The method for determining the viability of allograft by metabolic assay technique using radiolabeled aminoacids has been used recently. An experimental study was done for evaluation of viability of cardiac allograft which was preserved for 14 days at 4oC in nutrient medium[fresh preservation] by metabolism assay technique using 3H-glycine. Also, the effectiveness of low concentration antibiotic solution[CLPV] for sterilization was evaluated. The effectiveness of CLPV solution for sterilization of allograft was perfect. Pre-treatment cultured organisms were not cultured after treatment at all in every cases. The viability of allograft after sterilization was reduced to 66.4%[aortic wall], 74.7%[pulmonary wall], 76.3%[aortic valve], 67.9%[aortic wall]. And after the fresh preservation for 14 days, the viability was reduced to 14.7%, 18.5%, 17.7%, 19.0%, respectively.In conclusion, viability of allograft was reduce to 71.3[66.4-76.3]% after sterilization and 17.5[14.7-19.0]% after fresh preservation. And sterilization effect of CLPV solution was satisfactory.

• Journal of Korean Neurosurgical Society
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• 제53권1호
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• pp.6-12
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• 2013

Objective : This consecutive retrospective study was designed to analyze and to compare the efficacy and outcomes of anterior cervical discectomy and fusion (ACDF) using a fibular and femur allograft with anterior cervical plating. Methods : A total of 88 consecutive patients suffering from cervical degenerative disc disease (DDD) who were treated with ACDF from September 2007 to August 2010 were enrolled in this study. Thirty-seven patients (58 segments) underwent anterior interbody fusion with a femur allograft, and 51 patients (64 segments) were treated with a fibular allograft. The mean follow-up period was 16.0 (range, 12-25) months in the femur group and 19.5 (range, 14-39) months in the fibular group. Cage fracture and breakage, subsidence rate, fusion rate, segmental angle and height and disc height were assessed by using radiography. Clinical outcomes were assessed using a visual analog scale and neck disability index. Results : At 12 months postoperatively, cage fracture and breakage had occurred in 3.4% (2/58) and 7.4% (4/58) of the patients in the femur group, respectively, and 21.9% (14/64) and 31.3% (20/64) of the patients in the fibular group, respectively (p<0.05). Subsidence was noted in 43.1% (25/58) of the femur group and in 50.5% (32/64) of the fibular group. No difference in improvements in the clinical outcome between the two groups was observed. Conclusion : The femur allograft showed good results in subsidence and radiologic parameters, and sustained the original cage shape more effectively than the fibular allograft. The present study suggests that the femur allograft may be a good choice as a fusion substitute for the treatment of cervical DDD.

• 대한관절경학회지
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• 제15권1호
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• pp.36-41
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• 2011

현재 반월상 연골 절제술 이후 슬관절 동통을 호소하는 젊은 환자에서 치료 방법은 제한적이다. 이런 환자들에서 연골판 결손은 관절염 발생의 중요한 요소로 작용하지만, 인공관절을 시행하기에는 적절한 연령이 아니다. 이러한 경우 최근 점차 증가하는 치료 방법은 동종 반월상 연골 이식술이다. 그러나 동종 반월상 연골 이식술에 관해서는 아직도 많은 의문점이 남아있다. 또한, 문헌상 보고되는 동종 반월상 연골 이식술의 결과는 대부분 작은 수의 환자만을 대상으로 하거나 간접적인 결과만을 보고하고 있다. 이러한 많은 요소들 때문에 각각의 결과를 분석하고 비교하는 것은 매우 어려운 일이다. 본 종설에서는 동종 반월상 연골 이식술의 결과에 관한 최근의 연구를 고찰하였다.

• 대한골관절종양학회지
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• 제11권1호
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• pp.62-70
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• 2005

목적: 양성 골종양의 치료 시 발생한 공동의 골 결손에서 신선 동결 동종골 이식술을 시행한 결과에 대해 분석하고자 하였다. 대상 및 방법: 본원에서 양성 골종양으로 진단되어 종양 제거술 및 소파술 후 신선 동결 동종골 이식술을 이용한 재건술을 시행 받은 29례를 대상으로 하였다. 골 결손 부위의 크기는 술 전 단순 방사선 사진에서 병소 부위의 부피를 산출하였다. 최종 추시 상 이식된 동종골의 유합 여부 및 신생골 형성 및 재발 등을 조사하였다. 결과: 이식 골의 방사선학적 유합 소견이 관찰되기까지 소요되는 시간은 평균 11주였으며 순수하게 동종골 이식술만을 사용한 군은 11.4주, 동종골 이식술과 함께 자가골 이식술을 사용한 군은 10.7주, 동종골과 골대체물을 사용한 군은 13.6주 소요되었다. 술 전 방사선 사진상 병소의 면적이 40 $cm^3$미만인 군은 9.3주, 40 $cm^3$이상인 군에서는 12.9주에 유합 소견이 관찰되었다. 2례에서 동일 부위의 재발 소견을 보여 재수술을 시행하였으며 동종골 이식술로 인한 염증 반응 및 질환의 전파는 없었다. 결론: 저자들은 양성 골 종양의 소파술 후 신선 동결 동종골의 사용과, 동종골 및 자가골의 사용에 있어 비슷한 결과를 얻을 수 있었으며, 양성 골종양의 소파술 후 결손부위의 치료에 대해 자가골 이식이 가장 이상적인 방법으로 사료되나, 자가골 이식이 여의치 않은 소아의 경우나 골 결손부위가 커서 적절한 자가골을 얻을 수 없는 경우 등은 골 획득 및 처리가 비교적 간단하고 다양한 형태를 얻을 수 있는 신선 동결 동종골을 이용한 치료가 좋은 치료 방법의 하나로 생각된다.

• Clinics in Shoulder and Elbow
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• 제19권2호
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• pp.84-89
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• 2016

Background: The purpose of this study was to assess the results of arthroscopic bridging repair using a human dermis allograft in the treatment of massive irreparable rotator cuff tears. Methods: From November 2009 to April 2011, 12 patients underwent arthroscopic bridging repair using a human dermis allograft in the treatment of massive irreparable rotator cuff tears. Patients were followed for an average of 33.9 months. Clinical outcome was evaluated preoperatively and postoperatively using the mean University of California, Los Angeles (UCLA) score and the Korean Shoulder Scoring System (KSS). Magnetic resonance imaging (MRI) was performed postoperatively at an average of 6.5 months. Results: At a mean follow-up of 33.9 months (range, 25 to 42 months), 11 out of 12 patients were satisfied with their procedure. Patients showed significant improvement in their mean modified UCLA score from 15.9 preoperatively to 29.4 postoperatively (p=0.001). The mean KSS score improved from 45.6 preoperatively to 80.5 postoperatively (p=0.002). In MRI studies, 9 out of 12 patients had full incorporation of the graft into the native rotator cuff remnant. To date, there has been no intraoperative or postoperative complication from the graft procedure, such as infection or allograft rejection, in any patient. Conclusions: Arthroscopic bridging repair using a human dermis allograft can be considered as an option in treatment of select cases of massive irreparable rotator cuff tears, resulting in high patient satisfaction.

• Clinics in Shoulder and Elbow
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• 제24권3호
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• pp.183-188
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• 2021

We report a case of a 69-year-old right-dominant man who had an open Monteggia-like lesion of the right elbow (Gustilo-Andersen IIIA) with severe proximal ulna bone loss associated with an ipsilateral ulnar shaft fracture due to a motorcycle accident. The patient underwent two-stage surgery. Wound debridement and bridging external fixation were performed at first. Three months later, a frozen massive osteochondral ulnar allograft was implanted and fixed with a locking compression plate. A superficial wound infection appeared 5 weeks after the second surgery. Superficial wound debridement, negative pressure therapy, and antibiotics were administered for 3 months, achieving infection healing. At 3 years post-surgery, the elbow range of motion was satisfactory with a Disabilities of the Arm, Shoulder and Hand (DASH) score of 16.7. Radiographs and computed tomography scans showed good allograft-bone integration without allograft reabsorption or hardware loosening. Although not complication-free, massive ulna osteochondral allograft implantation can be considered a valid option in cases of open Monteggia-like lesions associated with ulnar shaft fracture and severe bone loss in active patients, whenever osteosynthesis or joint replacement is not a proper solution. This type of bone stock restoration allows for future surgery, if needed.

• Clinics in Shoulder and Elbow
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• 제24권4호
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• pp.261-264
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• 2021

A large parosteal osteoma arising on the surface of the right clavicle of a 39-year-old male patient was suspected preoperatively as a parosteal osteosarcoma. The lesion was treated with wide resection and allograft reconstruction. In this case report, we discuss the accurate diagnosis and appropriate surgical treatment for unusual clavicular tumors.