background: regulatory t cells have been suggested to have a protective role against acute rejection in allograft recipients. however, there is little information available about their contribution to chronic rejection process. the role of transforming growth factor-beta 1 (tgf- β1) as a profibrogenic and/or immunoregulatory cytokine in renal allografts is also controversial. objectives: to eva...

BACKGROUND Most tissue banks recover and irradiate tibialis tendon allografts from donors aged up to 65 years. It is unknown whether donor age and low-dose gamma irradiation affect the initial biomechanical properties of tibialis allografts. HYPOTHESIS Donor age up to 65 years and low-dose gamma irradiation do not significantly affect the initial biomechanical properties of tibialis allograft...

The authors report the history of a 74-year-old patient who underwent surgical treatment for segmental knee-joint periprosthetic bone loss using structural proximal tibial allografts coated with serum albumin. Successful treatment of late complications which occurred in the postoperative period is also described. The authors emphasize that bone replacement with allografts is a physiological pro...

Vancomycin-supplemented allografts provide biological restoration of bone stock and sound fixation with a low incidence of re-infection. Experimental incorporation of these grafts is similar to allografts without vancomycin. However, the underlying biology remains unknown. We report the first histological observations of vancomycin-supplemented impacted bone allografts in two reconstructions pe...

With the advent of segmental liver allografts from liver donors, reduced-size cadaveric allografts, and split cadaveric allografts, pediatric pre-transplantation patient mortality has reduced. However, this expansion of the donor pool for size-appropriate allografts for patients with end-stage liver disease has led to an increased incidence of biliary complications. We performed a retrospective...

One possibility to increase the organ pool is to use grafts from hepatitis B virus (HBV) surface antigen (HBsAg)-positive donors, but few data are currently available in this setting. Herein, we reviewed the outcome of 92 liver transplantations using allografts from HBsAg-positive donors in the United States (1990-2009). They had experienced HBV-related (n = 68) or HBV-unrelated disease (n = 24...

BACKGROUND The repair of large bone defects is a major orthopedic challenge because autologous bone grafts are not available in large amounts and because harvesting is often associated with donor-site morbidity. Considering that bone marrow stromal cells (BMSC) are responsible for the maintenance of bone turnover throughout life, we investigated bone repair at a site of a critically sized segme...

The ability of T and B lymphocytes to migrate into skin allografts undergoing rejection was studied in mice. Spleen cells from CBA/J mice sensitized to transplantation antigens of A/J or C57BL/6 mice were separated on immunabsorbent columns into purified populations of T and B cells, labeled in vitro with 3H-uridine and injected intravenously into CBA/J mice with 7-day old skin iso and allograf...

Metal meshes are used in revision surgery of the hip to contain impacted bone grafts in cases with cortical or calcar defects in order to provide rotational stability to the stem. However, the viability of bone allografts under these metal meshes has been uncertain. We describe the histological appearances of biopsies obtained from impacted bone allografts to the calcar contained by a metal mes...

We assessed the results of 17 limb-salvage procedures using osteoarticular allografts after wide resection of high-grade malignant bone tumours. All patients received chemotherapy. At the five-year follow-up, three patients had died from metastases. The allografts survived for five years in only seven patients all of whom had good function, ranging from 73% to 90% of normal. The allografts were...