[A procedure for quantitative roentgen image analysis for follow-up of Harrington scoliosis surgery]. / Ein Verfahren der quantitativen Röntgenbildanalyse zur Verlaufskontrolle bei Skolioseoperationen nach Harrington.

A photometric procedure for evaluating non-standardized X-ray films is described. The X-ray series of a total of 23 patients operated on because of idiopathic scoliosis have been measured out. In 16 patients Harrington's method with dorsal spondylodesis was applied and in 7 patients an electrical stimulation with an implanted stimulator was additionally employed. A time-saving effect of about 30 per cent for the osseous consolidation is obtained by this method. The fundamental suitability of the photometric procedure can be demonstrated.

[Behavior of alkaline serum phosphatase (AP) and its bone isoenzyme in healing of the osteotomized tibia in rabbits--an animal experimental study]. / Verhalten der alkalischen Serumphosphatase (AP) und ihres Knochenisoenzyms bei der Heilung an der osteotomierten Kaninchentibia--eine tierexperimentelle Studie.

The effectiveness of the electrical stimulation on the healing of an osteotomy was proved by determining the total alkaline phosphatase (AP) in the serum and its bone isoenzyme in rabbits. A non-stimulated animal group served as control. The changes appeared more distinctly by interference stimulation than by stimulation with bipolar rectangle impulses.

[Results of fluorescence microscopy studies of bone healing by direct stimulation with bipolar impulse currents and with the interference current procedure in the animal experiment]. / Ergebnisse fluoreszenz-mikroskopischer Untersuchungen zur Knochenheilung unter direkter Stimulation mit bipolaren Impulsströmen und mit dem Interferenzstromverfahren im Tierexperiment.

42 cross-breed rabbit bastards of either sex were osteotomized on the left proximal third of the tibia. A teflonisolated stable plating was made by means of the polychromatically KF-AO-instrumentarium. The animals were fluorescentlabelled in weekly intervals. Tetraverinex, alizarin complexon, fluorexon, xylenol orange and calceine were used as colours. The animals were stimulated in the bipolar squaretopped pulse current procedure (1 Hz and 10 Hz, resp., +/- 25 and +/- 50 microA, resp., intensity, permanent stimulation) or in the interference current procedure (oscillation frequency 100 Hz, intensity 1 mA, 4 hours daily). An osteotomized group served as a control. The undecalcified bone sections were quantitatively measured in the area of the periosteal and endoosteal accummulation seams as well as in the area of the Haversians canals and compared by means of multiple variance analyses. A delay in the Haversian remodelling within the first 2 weeks was found in the animals only osteotomized. This delay could not be detected in all electrically stimulated groups. The electrical stimulation leads to a shortening of the fracture healing period by skipping the physiologically occurring delay of the Haversian remodelling in fractures and osteotomies. Further on there was derived a growth function of the osteones as a regression function r (t) = a + beta X e gamma t. For the rabbit the concrete formula expression r (t) = 50.9 X e-0.094 X t + 17.4 for the animals not treated and r (t) = 42.9 X e-0.067 X t + 8.5 for the electrical stimulated animals has been found.(ABSTRACT TRUNCATED AT 250 WORDS)

[Rate of maturation of osteons]. / Untersuchungen über die Reifungsgeschwindigkeit von Osteonen.

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.

[The control of the effect of the electrical stimulation for the callus formation by means of conductance measurement in the rabbit tibia after osteotomy]. / Die Kontrolle der Wirkung der Elektrostimulation auf die Kallusbildung durch Leitwertmessungen an der osteotomierten Kaninchentibia.

The measurement of the resistance between the electrodes for stimulation during the operation shows the electrical field strength in the osteotomie. This one will recommend for the comparison of the results of stimulation experiments. The measurement in the course of healing shows faults at the electrodes and the contacts, whereas as the assertions about the process of healing are slightly.

Electrical stimulation of the callus formation by means of bipolar rectangular pulse sequences.

The clinical application of the electrical stimulation, lasting several weeks, for the callus formation is reported in 11 patients. Bipolar rectangular pulse sequences were used for the stimulation at a frequency of 1 Hz and a current intensity of +/-20mu amp. The electrical stimulation was successfully employed after distraction osteotomies with a KDA-apparatus in shortening of the leg provoked by different causes or in the treatment of pseudarthroses. The realignment of the newly formed callus and the osseous consolidation are stimulated and speeded up by the bipolar rectangular pulse sequences as it is also shown in the light of the roentgenograms of a case.

[Peripheral nerve injuries following implantation of total endoprosthesis in the hip joint and their treatment]. / Periphere Nervenläsionen nach Implantation von Hüftgelenktotalendoprothesen und ihre Behandiung.

The complication rate after 844 implantations of total endoprosthesis in the hip-joint, in the form of postoperative nerve injuries was found to be about 1 per cent. A number of causes may be responsible for nerve lesions, and some of these may be eliminated with a sparing operative technique. Although there are good prospects for the disappearance of paralytic symptoms, meaningful pysiotherapeutic after-care is very important. In the paralytic stage consistent exponential electrotherapy is recommended, and for recurring voluntary mobility active exercises against resistance. This will greatly improve the functional result of an operation with regard to nerve lesions.