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A Dau

Publications and source records attributed to A Dau.

5 recordsLinked to original sources
PubMed1994

The primary stability of intertrochanteric osteotomies. An experimental comparison of techniques.

We have compared the quality of intertrochanteric functional pre-bending with other techniques for varus and flexion intertrochanteric osteotomies by measuring interfragmentary compression, the tension in the angled blade-plates used and the stability of the different procedures. Intertrochanteric osteotomies with any kind of plate pre-bending gave the best results in our experimental studies. Impacting techniques gave poor primary stability and the Schneider method produced only moderate stability in flexion osteotomies. Using intertrochanteric functional prebending, varus and flexion osteotomies produced the best primary stability and the most equitable interfragmentary compression. This could be achieved with the highest precision by using a sawing gauge system at operation.

Biomechanical Phenomena↗
PubMed1991

[Experimental evaluation of a newly developed 90 degree angle plate (MC angle plate) for intertrochanteric derotation osteotomy].

A newly developed 90 degrees angled blade plate that permits high interfragmentary compression with a potential sliding way of 9 mm, is described. In the majority of intertrochanteric osteotomies, and especially when applying "functional pre-bending", the use of an external compression device is not necessary with this plate. The plate consists of 2 modules which permit a temporary thickening of the plate up to 10 mm, and the principle of dynamic compression can be performed with a 45 degree screw hole for the sliding way of 9 mm. The results of testing showed that a compression force of up to 1200 N was possible. The resulting interfragmentary compression could not be increased even with the aid of an external compression device or by idealized experimental conditions. Whenever dynamic compression is necessary for fixation, the modular compression principle described here can be used with any other plate system.

Biomechanical Phenomena↗
PubMedDate not supplied

[Optimization of the dynamic compression in angle-plated osteosynthesis by static interfragmentary compression--experimental results].

Osteosynthesis with an angled plate after intertrochanteric osteotomy is mainly a tension-band-osteosynthesis. Because of the lack of interfragmentary compression at the medial corticalis this technique may lead to pseudarthrosis or delayed bone union. On the basis of theoretical considerations and extensive experiments, we found a distinct improvement in interfragmentary compression when the osteotomy-planes are set at an angle of 6 degrees open to the lateral side before external compression with 1000 N. In this way "functional plate-prebending" is achieved. Thus tension-band-osteosynthesis is completed by compression osteosynthesis.

Bone Plates↗