TAILIEUCHUNG - Jähn et al. Journal of Orthopaedic Surgery and Research 2010, 5:32

Jähn et al. Journal of Orthopaedic Surgery and Research 2010, 5:32 TECHNICAL NOTE Technical Note Open Access A rapid method for the generation of uniform acellular bone explants: a technical note Katharina Jähn1,2, Volker Braunstein3, Pamela I Furlong1, Angharad E Simpson1, R Geoff Richards1,2 and Martin J Stoddart*1 Abstract Background: Bone graft studies lack standardized controls. We aim to present a quick and reliable method for the intra-operative generation of acellular bone explants. Methods: Therefore, ovine cancellous bone explants from the iliac crest were prepared and used to test several methods for the induction of cell death. Over night heat inactivation was used as positive. | Jahn et al. Journal of Orthopaedic Surgery and Research 2010 5 32 http content 5 1 32 éHMÌ JOURNAL OF ORTHOPAEDIC MBs SURGERY AND RESEARCH TECHNICAL NOTE Open Access Arapid method for the generation of uniform acellular bone explants a technical note Katharina Jahn 1 2 Volker Braunstein3 Pamela I Furlong1 Angharad E Simpson1 R Geoff Richards1 2 and Martin J Stoddart 1 Abstract Background Bone graft studies lack standardized controls. We aim to present a quick and reliable method for the intra-operative generation of acellular bone explants. Methods Therefore ovine cancellous bone explants from the iliac crest were prepared and used to test several methods for the induction of cell death. Over night heat inactivation was used as positive treatment control methods to be investigated included UV light or X- ray exposure incubation in a hypotonic solution salt-free water and a short cycle of repeated freezing and thawing. Results Viability of treated and 2 days cultured bone explants was investigated by lactate dehydrogenase assay. Nontreated cultured control explants maintained around 50 osteocyte viability while osteocyte survival after the positive treatment control was abolished. The most dramatic loss in cell viability together with a low standard deviation was a repeated cycle of freezing and thawing. Conclusions To summarize we present a freeze-thaw method for the creation of acellular bone explants which is easy to perform not time-consuming and provides consistent results. Background Large bone defects remain a clinical challenge and the development of novel therapies requires adequate controls. The use of acellular bone explants within bone graft studies is of crucial importance 1 . Results of transplanted bone material can not be interpreted correctly without the presence of a bone matrix control which does not contain viable cells. It is well known that the success of bone grafts is determined by three factors - osteoin-duction .

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