grafts can be autologous, allogeneic, or xenogeneic. autologous stsg transplantation is well established, and it is the preferred method of stsg transplantation. autologous stsg transplantation can be considered for grafts that are less than 33 cm and for reconstructions of the forearm. allogeneic grafts are considered when autologous grafts are not available. allogeneic grafts can be used when autologous stsgs are unavailable or when insufficient autologous stsgs are available, for example, in the case of large-surface burns. xenografts are considered when allogeneic grafts are unavailable or when rejection of allogeneic grafts occurs. the donor site for the xenograft is also the same site used for autografting. stsgs are prepared by removing the epidermis with a scalpel and then removing the dermis with a dermal off-set punch. the grafts are then stitched to the recipient site to secure the graft to the wound bed. the grafts are taken from the inner aspect of the thigh, which has good vascularity.  splitting the graft is done in order to reduce the time taken for grafting and increase the graft success. there are various types of splitting methods.
stsg can be split horizontally, vertically or both horizontally and vertically. the horizontal split is divided into two splits which are then divided vertically. the vertical split is divided into two splits which are then divided horizontally. horizontal splits are generally used with the larger grafts. the larger the split, the longer it takes to heal. therefore, most split-thickness skin grafts are split horizontally. vertical splits are generally used with the smaller grafts. the larger the split, the shorter it takes to heal. this is the reason why the most common split-thickness skin grafts are split vertically. in general, the splitting has to be done soon after the graft has been applied. this is to avoid splitting the skin graft in transit from the donor site to the recipient site.