Biomedical subjects

U Helwig

Publications and source records attributed to U Helwig.

23 records · Page 2Linked to original sources

PubMed1992

[Therapy of bone metastases of the lower extremity with the KMFTR modular tumor endoprosthesis system].

During the years 1975 through 1989, 189 patients have been operated because of metastases within bones of the lower extremity. Thereof, 34 patients received an endoprosthesis of the KMFTR (Kotz Modular Femur-Tibia reconstruction system) type. In detail, the following reconstruction elements had been used: proximal femur (n = 20), distal femur (n = 7), complete femur (n = 2), proximal tibia (n = 5). At the time of follow-up examination 30 patients had died. Mean survival time after resection of metastases was 18.6 months (range 8-44 months). According to histologic judgement, in 23 cases wide or marginal resections had been performed whereas 11 patients had been operated intralesionally. In no case local recurrence as relevant to therapy was observed. At the same time-point, survival periods after detection of secondary manifestations of the malignant diseases within the remaining 4 patients were 29, 61, 73 and 125 months, respectively. The following complications were observed: luxation of the prosthesis (n = 6), transient paresis of the peroneus (n = 3), deep vein thrombosis (n = 2), pulmonary infarction (n = 1), wound healing disturbances (n = 2) and hematoma (n = 3).

Acetabulum↗

PubMedDate not supplied

[Effectiveness of epicondylitis bandages from the biomechanical viewpoint--an experimental study].

QUESTIONS: During extension of the elbow joint (test measurement) and extension of the wrist (control measurement), maximal bandage pressure is desired on the extensor group of the forearm, especially of the M. extensor carpl radialis brevis (ECRB). Do the various commercial epicondylitis bandages produce a mechanical effect on the extensor group of the forearm and how do the maximal pressures of these bandages behave in direct comparison? Are the pressures produced clinically relevant? METHODS: Eleven different epicondylitis bandage constructions were examined for their biomechanical effects. The exerted pressure was measured continously during the above-mentioned movements. A fist-closing strength of ca. 30 N was maintained for the necessary pre-stressing of the forearm muscles. RESULTS: Strap-type bandages were the only bandages to produce adequately high pressures. Bands applied at pressures which approach those of the straps led to obstruction in bloodflow. Stocking designs showed no effect in respect to our study. CONCLUSION: Bandages which apply pressure to relieve the tendon insertion of the extensor muscles must, from a technical standpoint, be of a strap construction in order to build up adequate pressures to be effective.

Adult↗

PubMedDate not supplied

[Adaptation osteotomy in idiopathic femoral head necrosis].

Thirty-nine patients who suffered a segmental ischemic necrosis of the hip, fifteen of which affected on both sides, were treated with osteotomy of the femur. The re-examinations were carried out after an average period of 6.6 (2.5-12) years. While in twenty one cases, the hip necrosis was treated exclusively by varisation, in thirty three cases a combination of varisation and flexion was effected. 12 patients (equivalent to 22.2%), all of them with a necrotic angle of more than 115 degrees, were provided with a total hip arthroplasty in the interval. The patients with a necrotic angle smaller than 115 degrees showed a definite alleviation of the pain symptoms, an increased hip flexibility and an improved locomotory pattern.

Adult↗

PubMedDate not supplied

[KMFTR (Kotz Modular Femur Tibia Reconstruction System) modular tumor endoprosthesis system for the lower extremity].

206 patients with tumorendoprosteses of the KMFTR-type at the lower extremity were operated at the Institute Rizolli Bologna and at the University Clinic of Vienna. The minimum follow up was 2 years (mean 3.2, max. 8 years). In order to bridge the defect caused by tumor resection the proximal femur was replaced in 42 cases, the distal femur in 119 cases and in 6 patients a total femur prosthesis was used. The proximal tibia was replaced in 35 cases and in 4 cases a total knee prosthesis was implanted. Clinical evaluation according to Enneking revealed 71.6% excellent and good results. In 83.4% the radiological score was higher then 20. We saw deep infections in 8.2% (17 patients), breakage of the prosthesis in 6.8% and aseptic loosening in 5.8%. 3 patients had to be amputated due to infection. In the remaining cases of infection in 66% of the patients healing was observed. All cases of aseptic loosening or breakage could be revised successfully by an exchange of the prostheses and therefore salvage of the leg was achieved.

Adolescent↗

PubMedDate not supplied

[Surgical therapy of metastases of the pelvis and sacrum].

We are reporting on 42 surgical and 5 conservative treatment approaches in metastases of the pelvis and sacrum. With an average disease-free survival of 14.4 months the majority of the lesions were resected intralesionally. In the area of the ischium and the pubis resection alone was done without further stabilizing measures. If the resection was in the area of the iliac wings, stabilization was achieved by means of osteosynthesis in 50% of the cases. Periacetabular resections required reconstruction with endoprotheses in all cases. In patients with good prognosis and solitary metastases also extralesional resections were performed. Reoperated embolization was used in advanced stages of the disease or if the metastases were not easily accessible surgically. Because of the complexity of pelvic resections and the often considerable loss of function, patients with metastases are often treated with intralesional resection and osteosynthesis. In exceptional cases, if radiotherapy had failed or multiple intralesional resections were followed by recurrences, we feel however that extralesional resection should be attempted with good prognosis for the patient.

Adenocarcinoma↗