M. Wiedemann

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The main problem with fractures of the femoral neck is the high incidence of avascular necrosis and non-union. While the rate of pseudarthroses has been lowered by treatment with stable compression screws, no effect of this technique on the incidence of head necrosis is evident. The reasons for this are rupture of vessels, wide dislocation of fragments and(More)
Fracture dislocations of the tibial plateau have associated pathology including ligament- and meniscus tears. They therefore require different treatment than split- or impression fractures. The operative and nonoperative management depends on the soft tissue injuries including ligament tears and depends also on the functional requirements of the patient.(More)
Three-dimensional perception of the environment offers significant potential to improve navigation solutions for mobile systems. The Pixel-Mixed-Device Technology (PMD) offers here a small, lightweight camera generating 3-D images, based on time-of-flight measurements. This contribution analyzes the sensor characteristics and application potential for(More)
It is uncontested that most patellar fractures have to be treated by open reduction and internal fixation. Nevertheless, there are well-defined types of patellar fractures in which such a procedure is unnecessary because the fracture is stable and the retropatellar surface is congruous. In these fractures internal fixation would constitute overtreatment;(More)
  • M Wiedemann
  • 1996
The technique of callus distraction can be traced back to the work of Codivilla at the beginning of the century. Subsequent to Codivilla, various crude methods of limb lengthening were used but resulted in high complication rates. Not until the work of Putti and Abbott in the 1920s and their painstaking operative technique did the results become verifiable.(More)
Up to 30% of the western population experience at least one syncope during their lifetime. The prognosis is considered to be good in patients without structural heart disease. However, for patients with cardiac syncope and impaired left ventricular function, incrased mortality rates were shown in several studies. Diagnostic procedures to clarify the(More)
A series of 98 patients with a total of 105 intra-articular fractures of the os calcis were operated on during a 10-year period between 1983 and 1992. We were able to follow up 60 patients with 64 fractures an average of 44 months (range, 18-105 months) postoperatively. At the time of follow up, 83.9% of patients had been back to work, 78.6% with the same(More)
Total cavo-pulmonary anastomosis is frequently performed to palliate patients with a broad variety of congenital heart defects with functionally univentricular hearts precluding biventricular circulation. In patients with risk factors for primary repair a stepwise approach is frequently chosen with initial creation of an aorto-pulmonary shunt followed by a(More)
There are various ways and means of performing the callus distraction procedures used more and more frequently in the clinic today. The interplay of numerous factors affects the macroscopical and microscopical morphological appearance and thus the quality of the bone regenerate. The radiological appearance during and after distraction remains relatively(More)