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Biomedical subjects

C J Wirth

Publications and source records attributed to C J Wirth.

At least 127 records · Page 7Linked to original sources
PubMed1984

[Knee arthroplasty - another late result 34 years later].

This description of a 34-year course of a knee-joint arthroplasty after fibrous ankylosing of the knee joint due to shell-splinter injury and lower-leg amputation contralaterally is intended to draw attention once again to this method of treatment. In particular, the great importance of co-operation by the patient in this method of treatment is underlined. Even today, allo-arthroplasty is in such cases no alternative offering a more favourable prognosis when compared with the long-term result obtained by means of the method described.

Aged↗
PubMed1983

Temporary intraarticular knee stabilization with synthetic material (Polyester-Silicon) in the sheep.

We draw the following conclusions from these animal experiments: a) It is possible to stabilize the knee joint of a sheep after resection of the anterior cruciate ligament by a suitable synthetic band. A foreign body reaction did not occur. b) After replacement of the anterior cruciate by an auto-, homo- or heterologous material, it was not necessary to immobilize the joint. c) In comparison to a control group, it appears that the transformation of the replacement material occurs faster due to the functional stimulation under guided mobility. d) The smooth surface of the synthetic material prevents its incorporation into connective tissue. Therefore, it is possible to remove this synthetic material after sufficient strength of the implanted material has been obtained. e) By fixing the synthetic band on the femoral shaft and the tibial head it can be removed without problems by small skin incisions without opening the joint. f) Kinking, wear and fatigue of the synthetic material can be avoided by rerouting the band around the lateral femoral condyle and the tibial edge. g) These results of animal experiments cannot be transferred to the human knee without great caution. Yet, it seems at least technically possible to achieve primary knee stability by a synthetic band in connection with a suture or replacement of the anterior cruciate.

Animals↗
PubMed1983

[Use of radiological diagnosis in sport injuries and lesions].

The diagnosis of a sport injury or a sport damage is usually made by the clinical investigation. However, the X-ray examination is indispensable. In addition to standard projections further radiologic techniques such as passive motion, tomography, computed tomography, arthrography or angiography are necessary. The relevant use of these X-ray methods with regard to sport injuries or damages of the particular regions of the locomotor system are described.

Adolescent↗
PubMed1982

[Type and choice of bone transplant in non-infected and infected pseudarthroses of the long tubular bones].

There is unanimous agreement on the need for primary stabilisation of non-infected and infected non-unions of long tubular bones. It is possible to draw up a general schema. With regard to the type of bone transplant usually required, we can make use of purely cortical, corticospongy and spongy bone chips. It is also possible to delimitate the appropriate fields of indication. An essential prerequisite for the proper healing of a bone graft is the stability and satisfactory vascular reaction of the transplant bed. The article describes and discusses the results of such treatment of non-infected and infected non-unions of long tubular bones, taking the above-mentioned aspects into consideration.

Bone Plates↗
PubMed1981

[Connection between Böhler's angle and subtalar arthrodesis after calcaneal fracture (author's transl)].

Subtalar arthrodesis is a common intervention after comminuted fractures of the calcaneum. To clarify the connection between fracture of the calcaneum and the negative late results, all 81 subtalar arthrodeses following calcaneal fracture which had been carried out from 1959-1980 in the Munich Orthopedic Hospital were classified according to type of treatment of calcaneal fracture, radiological signs of arthrosis, Böhler's angle and the interval between fracture and arthrodesis. It can be shown that subtalar arthrodesis after comminuted fractures of the calcaneum may be necessary, irrespective of the Böhler's angle and the signs of arthrosis visible in the röntgen picture. Consequently the interval between the fracture and the arthrodesis is of subordinate significance. The most important parameter is the patient's pains.

Adolescent↗
PubMed1981

[Biomechanics, technique and results of fibular ligamentous grafting at the ankle joint (author's transl)].

The grafting operations according to Watson-Jones and Evans in old fibular capsular ligament lesions of the ankle joint have the effect of tenodesis as far as the talo-calcaneo-navicular joint ist concerned, since especially the natural course of the ligamentum calcaneofibulare, which requires substitution, is not considered. The authors conducted a search for the most favourable course when replacing the ligamenta talofibulare anterius and calcaneofibulare, using a thread model on ankle joint preparations. It is only the direct replacement of these ligaments which is most likely to ensure free mobility of ankle joint and the talo-calcaneonavicular joint with optimal joint stabilization. Courses proceeding differently will lead either to tenodesis or to slackening of the ligamentous replacement without producing a stabilizing effect. From the author's own patient, two groups with anatomically compatible ligamentous replacement with lyodura (n = 12) or with a modified graft of the short peroneal muscle (n = 8) were compared with each other. In accordance with the experimental results, the main difference between the two processes was the restriction in supination of the talo-calcaneo-navicular joint. The authors conclude from their results that duraplasty, which follows the anatomical course of the ligaments to be replaced, is indicated particularly in such patients who require free supination of the foot because they are active in certain types of sport where this is essential.

Ankle Injuries↗
PubMed1980

Biomechanic studies reinserting the medial collateral ligament to correct a chronic anteromedial instability of the knee joint.

One possibility to correct a chronic anteromedial instability of the knee joint is the osseous reinsertion and tightening of the medial collateral ligament. In experiments with a string model and strain gauges attached to the ligaments we investigated the advantages and/or disadvantages of the femoral and tibial reinsertion. Regarding the tension mechanism the medial collateral ligament reacts considerably more sensitivity to the femoral reinsection in proximal-dorsal direction than to the tibial-reinsertion in distal-ventral direction. An accurate knee flexion between 40 and 60 degrees has to be provided reinserting the ligament in proximal-dorsal direction to avoid excessive tension and resulting destruction of the ligament. However the reinsertion of the ligament in distal-ventral direction, independently from the flexion of the knee, always approximates the natural tension of the anterior and posterior margin of the untreated ligament. Biomechanically the reinsertion in distal-ventral direction to tighten the loose ligament seems to be preferable to the reinsertion in proximal-dorsal direction.

Biomechanical Phenomena↗