Biomedical subjects
Publications and source records attributed to J Polster.
This is a report about the experiences made on 93 patients with the Judet hip prosthesis for cementless fixation. Considering the results of 103 implanted hip prostheses, this system can be recommended for both primary and exchange operations.
An instrument set for application in patients requiring a correction treatment and/or a temporary fixation of the cervical spine is described. The halo is combined with a cast or a brace employing the 8 mm Hoffmann External Fixator system supplemented by three additional, newly designed parts. Applications of the instrument set in the treatment of traumatic fracture, fibrous dysplasia and ankylosing spondylitis are described.
Halo fixation has proved eminently suitable for introducing corrective forces into various regions of the vertebral column. The local complications necessitating changes of screws are directly related to the tightness of the screws. By carefully checking the tightness of the screws with a torque screwdriver complications due to the screws can largely be avoided. The magnitude of the force introduced and the duration of halo fixation are of secondary importance under these conditions. No penetrations of the screws or persistent infections were found; thanks to the spacers, severe injuries due to the halo tearing out as a result of a fall can be avoided. The considerably higher rate of complications and the severe complications with the halo cast fixation are caused by the rigid connection between the halo and thoracic plaster or respectively the plastic jacket, and the specific features of observation of the course in particular conditions e.g., Bechterew's disease.
Onion cepa (L.) and Tsuga canadensis (L.) Carr. were investigated histochemically on the association of flavanols to nuclei. The young roots of Onion cepa are totally devoid of flavanol structures. Therefore, the excised roots tips were directly incubated into different solutions of flavanols. After 3 h of incubation a flavanol binding on the nuclei was recognizable, as seen by a yellowish-brown tanning reaction. Still to ensure the presence of flavanols on the nuclei, subsequent staining with the p-dimethylaminocinnamaldehyde reagent (DMACA) resulted in an intense blue colouration. Tsuga canadensis has significant amounts of vacuolar flavanol deposits in all parts of the tree as indicated by the DMACA reagent. It is obvious that also the nuclei were associated strongly with flavanols which can be demonstrated particularly elegant in the cells of the seed wings by histochemical methods. However, the mode of flavanol release from the original deposits is not yet clear.