1,720,981 research outputs found
"Pelvic Resections: The Rizzoli Institute Experience"
No full textMaterials, methods, and techniques of pelvic resections are discussed. Results, including the complications of nerve damage, infection, and vascular, visceral, and reconstructive complications are tabulated
Differenti tipi di trapianti omoplastici e loro indicazioni
No full textViene discussa la cinetica di riabilitazione degli innesti ossei omeoplastici. Vengono illustrate le modificazioni sulla immunologia, capacità osteoinduttive e resistenza meccanica degli innesti dovute alle varie tecniche di procesazione,sterilizzazione e conservazione degli stessi
Le protesi composite in chirurgia ortopedica [Allograft-prosthetic composites in orthopedic surgery]
No full textA allograft-prosthetic composite is a method used for reconstruction of great loss of metaepiphyseal bone substance in prosthetic revisions, in posttraumatic loss of substance, and in oncologic orthopedic surgery. Composite technique is a combination of a massive allograft with a conventional joint prosthesis. The bone graft allows both the restoration of an appropriate metaphyseal bone stock, and a valid reinsertion of the tendon structures of the host. The prosthetic component warrants a rapid functional recovery, with a joint surface which is stable in time. The authors describe the surgical technique of prosthetic composites at the level of the proximal femur and the proximal tibia. Both anatomical locations have shown a greater functional advantage with this method than with the use of megaprosthesis after resection. The possibility of obtaining any valid insertion of the tendon of the gluteus muscles at the level of the hip allows the restoration of active abduction; at the proximal tibia, the anchorage of the patellar tendon warrants active knee extension. In extra-articular resections of the knee in oncologic surgery, prosthetic composite is a method of choice because it prevents the arthrodesis of the knee, and allows a functional reconstruction of the joint through the implant of a massive graft of the proximal tibia comprehensive of the extensor apparatus associated to a conventional long-stem prosthesis
"Innesto di Omero Totale: Presentazione di Due Casi"
No full textGli autori riportano l'esperienza di due casi affeti da osteosarcoma coinvolgente l'intero omero, operati di resezione e ricostruzione mediante innesto massivo omeoplastico osteoarticolaredi omero totale, armato con chiodo endomidollare e cemento acrilico. Viene descritta la tecnica chirurgica, sono riportati i risultati funzionali e si discutono i vantaggi di questa tecnica rispetto ad altre alternative ricostruttive
Italian Experience on Bone Allograft International Symposium on Bone and Soft Tissue Allografts.
No full textItalian Experience on Bone Allograf
Reconstrucçao com pròtese modular nao cimentada apòs ressecçao tumores òsseos.
No full textOs autores analisaram 152 pacientes portadores de tumores ósseos tratados no Instituto Ortopedico Rizzoli, entre 1983 e 1989, submetidos a ressecçäo e reconstruçäo com prótese modular nao cimentada KMFTR (Kotz Modular Femur and Tibia Reconstruction). Após cinco anos de seguimento, os resultados funcionais foram considerados excelentes e bons em 83 por cento dos casos de fêmur proximal, em 75 por cento de fêmur distal e em 75 por cento de tíbia proximal, segundo a classificaçäo de Enneking. A fixaçao da prótese foi considerada excelente e boa na totalidade dos casos de tibia proximal, em 97 por cento de fêmur proximal e em 78 por cento de fêmur distal, segundo os critérios da International Society of Limb Salvage, nao havendo casos de mobilizaçäo asséptica sintomática. As complicaçöes mecânicas foram as mais comuns (40 por cento), porém sua resoluçäo näo alterou significativamente o resultado funcional. Entretanto, daqueles que apresentaram infecçäo (10 por cento), cinco foram amputados. Baseados nos resultados obtidos, os autores consideram a próte
Total calcanectomy and reconstruction with vascularized iliac bone graft for osteoblastoma: a report of two cases
No full textTumors affecting tarsal bones are a rare occurrence, accounting for approximately 1% of primary tumors of the skeleton, with the calcaneus being the most frequent site.
Osteoblastoma occurrence in the bones of the foot is not infrequent, ranging from 3.4 to 11.1% of the cases in different series, with the talus most common followed by the calcaneus.
Total excision of the calcaneus can be the treatment of choice in aggressive benign tumors and in selected cases of malignant tumors. Reconstruction of the heel after total calcanectomy is a challenging procedure and different techniques have been proposed. Due to the rarity of this condition, most of the reports in the literature involved a single case with no series reported. We describe
two cases of aggressive osteoblastomas extensively affecting the calcaneus requiring total calcanectomy. In order to restore a functional weightbearing hindfoot after calcaneus excision, in both cases we performed a heel reconstruction by vascularized iliac crest graft fixed to the talus and the cuboid. Oncological, radiographic and functional results of these procedures at an average followup of 7 (range, 6.6 to 7.7) years are reported
"Sostituzione Protesica nella Resezione Biarticolare di Ginocchio (descrizione di quattro casi)"
No full textGli autori riportano l'esperienza di quattro casi di osteosarcoma del ginocchio con "Skip" metastasi transarticolari , operati di resezione extrarticolare ed artroprotesi sostitutiva del femore distale e della tibia prossimale. Vengono valutati i risultati e si discutono le indicazioni e le problematiche inerenti l'esecuzione di tale ricostruzione
Riabitazione degli innesti spongiosi e tecniche di stimolazione [Bone allograft rehabilitation and growth factors]
No full textBone regeneration is based upon the three components of osteoconduction, osteoinduction and osteogenesis. During last years several bone substitutes have been developed to obtain a graft with ideal osteoconductive capabilities. Osteogenesis too has been emphasized with the progress of tissue engineering. Osteoinduction and the intrinsic osteoinductive properties of native bone have been already stressed by the historical works of Marshall Urist in 1965 about demineralised bone matrix (DBM). Only 20 years later the genetic sequences of the bone morphogenetic proteins (BMP) were identified and classified with the identification of a number of different BMPs whose precise role in the osteoinduction process is still extensively studied and not well defined. But experimental and preclinical studies have shown also that the BMPs are not playing alone on this stage. A lot of proteins secreted by the cells are implied in the process of healing and new bone formation; to these factors has been generically assigned the term of growth factor and an increasing number of these have been identified and used in experimental studies. The more debated are the transforming growth factor beta (TGF-β), the fibroblast growth factor (FGF), the insuline-like growth factor (IGF) and the platelets derived growth factors (PDGF). Obviously these are only some of the variety of factors that participate together with BMPs in a normal healing process
Synovial chondrosarcoma of the hip: report of two cases and literature review
No full textSynovial chondrosarcoma (SCH) is a rare malignant tumour. The lesion may arise de novo in intra-articular space or, more frequently, it may occur as a malignant degeneration of synovial chondromatosis (SC). The authors report two cases of SCH of the hip joint occurring on a SC diagnosed 23 years earlier in one case and 10 years earlier in another case. In both cases the SCH showed an intermediate grade of malignancy at histology (grade 2). In the first case, the patient underwent an external hemipelvectomy and he was disease-free 10 years after the operation. In the second case, the patient refused the proposed amputation and, after palliative radiation therapy, she was alive with disease 58 months after diagnosis. A review of literature reports on SCH was carried out. The knee was the most affected joint, followed by the hip. An amputation was performed in two thirds of cases. Amputation was done as primary surgery in one fifth of cases and for tumour recurrence after synovectomy in four fifth of cases. Metastatic dissemination was seen in 29% of cases. An early detection of malignant transformation of SC might improve the rate of limb salvage surgery in these patients, although no reliable clinical and imaging signs of malignant degeneration have been identified so fa
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