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Biomedical subjects

C Dietschi

Publications and source records attributed to C Dietschi.

At least 19 recordsLinked to original sources
PubMed1987

[Personal experiences with uncemented prostheses].

Experience with different types of non-cemented total hip endoprostheses is critically discussed. Three radiological criteria of a good result indicated: the presence of radiolucent lines, cancellous transformation, and a particular appearance and thickness of the cortex. The radiological changes and clinical results make it possible to draw a 'survival curve' for each type of implant. This series shows that unsatisfactory results have been due mostly to primary diaphyseal, distal fixation of the prosthetic stem. The CLS prosthesis, with mainly metaphyseal primary anchorage, is presented. Discussion of the radiologically and histologically established response of bone.

Adult↗
PubMed1983

Surface replacement hip arthroplasty with the Freeman double cup.

The authors report their clinical experience with 43 hip arthroplasties using Freeman's double femoral cup. The patients were followed up from 3 to 6 years after operation. At that time, only 44% were totally free from pain, while migration of the femoral cup, which was severe and progressive, was observed radiographically in almost half the cases. In 3 cases it was possible to study histologically the stump of the neck of the femur and the zone of contact between femoral bone and cement. Biomechanical studies were also performed with photo-elastic models, using the technique of finite elements. These studies indicated overloading on contact between the edge of the femoral cup and the cortical bone (especially medially), but without any load over the whole of the spongy bone. Consequently there was bone resorption in the overload zone and osteoporosis in the spongy bone. The femoral cup rapidly became unstable, and this produced progressive migration, thus constituting a vicious circle.

Biomechanical Phenomena↗
PubMed1982

[Cruciate ligament lesions. Medico-statistical analysis].

The number of cruciate ligament injuries has grossly increased between 1970 and 1979 in the statistics of the Schweizerische Unfallversicherungsanstalt. Attention is drawn to new and more differentiated methods of diagnoses and therapy. A falloff of the invalidity rate owing to a betterment of diagnoses and therapy can only be observed trendwise. Preventive measures should be demanded above all in sports because there we find the origin of more and more cruciate ligament injuries.

Accidents↗
PubMed1979

Computed tomography reconstruction from hollow projections: an application to in vivo evaluation of artificial hip joints.

The long-term mechanical stability of total hip arthroplasties limits the application of this widely used surgical procedure in cases of severe coxarthroses. A noninvasive method of assessing the tissue distribution in the vicinity of the implant--bone interface is needed to identify early signs of implant loosening and to evaluate new prosthetic solutions. In order to develop such a method, a modified computed tomography technique has been devised that yields cross-sectional images without the usual artifacts caused by metallic implants. This technique provides information on bone mineral and bone cement distributions as well as on the precise position and orientation of the implant within the femur shaft. Results obtained from excised human femurs and preliminary data from measurements on patients made 3 months postoperatively reveal that the bone cement distribution is much less favorable than is indicated by radiographs.

Aged↗
PubMed1977

[Secondary intervention after hip prosthesis (author's transl)].

From 1965-1975 in the orthopedical Univ. Clinic Balgrist, Zurich, there were 177 reoperations after total hip prostheses necessary. In 91 replacements the interval between first and second operation was an average of 4.1 years, in 67 prosthesis-removements 2.1 years. The follow-up showed a relationship between bacteriological culture taken before and during operation and clinical results. The decision to change or remove the prostheses should be made on the positive or negative bacteriological results.

Aged↗