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Adult↗
Biomedical subjects
J Hellinger
Publications and source records attributed to J Hellinger.
[Anchoring experiments on human cadaver vertebrae using various types of screws].
The firmness of the bone structure of vertebrae of human cadavers was investigated by turning screws of four different types into vertebrae T6 to L5 and subjecting them to axial tension up to the point of extraction. It was found that the cancellous bone screws (rather than the Zielke screw) had the best anchoring characteristics in bone tissue. The shearing fracture stress of the vertebral bone tissue was found to be approx. 1.80 N/mm2; the relation between the extraction forces and the individual vertebrae was also examined. In addition, the extraction forces were determined for screws inserted into vertebrae T6 to L4, as performed in Zielke's ventral spondylodesis procedure, as well as the lower tolerance limit for each vertebra in this segment of the vertebral column.
Adult↗
[Results of total endoprosthetic treatment of dysplasia coxarthrosis with additional autologous acetabuloplasty of the roof of the acetabulum].
With reference to the different operative treatments of dysplasia coxarthroses with a total hip endoprosthesis, 43 operations on the hip joint performed from 1975 to 1979 with a filling up to the acetabular roof defect with an autogenous bone graft had a clinical and roentgenological follow-up. The results were evaluated by means of a standardised procedure, and it was demonstrated with the help of clear successes that also anatomopathologically complicated cases can be provided with a suitable total endoprosthesis.
Acetabulum↗
[Rate of maturation of osteons].
This paper examines the dynamics of Havers'ian remodelling and the concept of maturation rate of poly-chrome fluorescence-labeling osteons by means measurements of bone formation. It was used cortical bone of rabbit and merino sheep on various experimental conditions (Normal bone growth in the diaphysis of large bone and cortical bone of iliac crest, secondary fracture healing in tibia osteosyntheses with external fixation and oligotrophic pseudoarthrosis in rabbit. Gap healing of fractures in tibia osteosyntheses with external fixation and compression in the sheep). The diameters of labels were measured and the mathematical function of maturation rate of osteons was made out. The results were compared on the different experiment conditions. Statistical analyses have shown that the results of mathematical function and the values of their constants are not significantly different. These results seem to suggest that the rate of formation of the osteon is optimal on the various conditions and it is not use stimulating the osteoblastic activity with stimulation-therapy. The described model shows important informations of bone remodeling and adds new facts to the understanding of formal genesis of bone growth and fracture healing.
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