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Biomedical subjects

T h Rüedi

Publications and source records attributed to T h Rüedi.

4 recordsLinked to original sources

[Experiences with plate fixation in 131 femoral shaft fractures].

A consecutive series of 131 comminuted fractures of the femur in 123 patients has been reviewed. All fractures were stabilized by means of rigid ASIF-plate fixation (mostly DCP). About 60% of the patients were polyfractured or polytraumatized (including brain, chest and abdominal injuries). In 85% of the cases the fracture was stabilized within 24 h after the accident and usually the patients remained on a ventilator with PEEP for 1 to 2 days postoperatively. Of the 4 postoperative deaths only two patients died of a pulmonary complication. All patients could be reexamined 1-3 years postoperatively. Although a number of them had suffered from complications (osteitis, fatigue fractures of the plate, delayed union) and had to be reoperated,92% of the cases displayed an excellent or good functionl result. The factors to reduce the complication rate(i.e. primary cancellous bonegraft) are being discussed.

Bone Plates↗

[Titanium, steel and their combination in bone surgery].

The combined application of Titanium plates with stainless steel screws appeared interesting, making a more elastic plate available without the risk of screw fractures. 3 different combinations of Titanium und stainless steel implants were tested in the animal and on humans. A morphometric evaluation of the soft tissue (animal) gave similar good results for stainless steel implants as for the combination of Titanium and steel, while pure Titanium gave the best result. Atomic absorption tests (human) showed that in case of the Titanium/steel mixture only the stainless steel screws did corrode. Delayed fracture healing or mechanical instability always gave risk to more metal deposits in the soft tissue than primary bone healing. If the advantages of Titanium seem important and if the rigidity of stainless steel screws may not be missed, the combination of the two metals appears possible and without danger.

Alloys↗