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Biomedical subjects

U Lucht

Publications and source records attributed to U Lucht.

At least 37 records · Page 2Linked to original sources
PubMed1984

Instability of trochanteric hip fractures following internal fixation. A radiographic comparison of the Richards sliding screw-plate and the McLaughlin nail-plate.

A comparison was made of the McLaughlin nail plate and the Richards sliding screw-plate techniques for fixation of trochanteric hip fractures. The series included 96 patients in each group. The fractures were followed radiographically for 3 months. Technical failures were encountered in 31 per cent of the McLaughlin fractures and in 8 per cent of the Richards fractures; reoperation was performed in 9 per cent in McLaughlin vs none in the Richards fractures. The main failure was varus displacement in both groups, always combined with lateral cutting of the screw in the Richards fractures, and often combined with failure of the nail-plate junction in McLaughlin fractures. Our study has shown that the sliding screw-plate is superior to the nail plate in both stable and unstable fractures.

Adult↗
PubMed1983

Selection of amputation level. Comparison between morphine puncture test and skin perfusion pressure.

In 46 amputations performed on account of peripheral occlusive arterial disease, the morphine puncture test (MPT) and the local skin perfusion pressure measurement (SPP) were carried out preoperatively. Below-knee (BK) amputation was performed when the SPP was greater than or equal to 40 mm Hg unless clinical criteria indicated otherwise. Out of 12 BK amputations without any clinical skin changes, where the SPP was greater than or equal to 40 mm Hg but the MPT was negative, healing was achieved in 11 patients. Thus, if the MPT had been used as an objective method to determine the amputation level, 11 knees would have been sacrificed. The MPT is thus not suitable for determination of amputation level in patients with peripheral occlusive arterial disease.

Adult↗
PubMed1983

Blood flow in the juvenile hip in relation to changes of the intraarticular pressure. An experimental investigation in dogs.

The blood flow in the hip joint of puppies was studied by means of the microsphere technique. The flow was determined before, during and after intraarticular pressure increase. A venous tamponade of 50 mmHg resulted in a significantly reduced flow in the femoral head and after an arterial tamponade of 150 mmHg the flow almost ceased. The proximal femoral metaphysis, the acetabulum and the hip joint capsule, on the contrary, showed varying degrees of flow increase. It is suggested that the significantly increased blood flow in the hip joint capsule during the intraarticular pressure increase of 50 mmHg and 150 mmHg is caused by an autoregulatory mechanism tending to restore the blood flow in the suffering femoral head. The demonstrated disturbance of the circulation in the juvenile femoral head after venous tamponade supports the theory that synovitis may be the basic mechanism in the production of Calvé-Legg-Perthes' disease.

Acetabulum↗
PubMed1982

Heat generation in plaster-of-Paris and resulting hand burns.

Four female pupils at a technical school received hand burns while trying to make moulds of their hands using a dental plaster instead of ordinary plaster-of-Paris. In three cases the burns were so severe that several fingers had to be amputated due to irreversible tissue damage. The severity of the burns is explained on the basis of an experimental study where it was demonstrated that the temperature of hardening dental plaster rose to 70 degrees C and had a hardness that was 10-times greater than ordinary plaster-of-Paris. This should serve as a warning against the use of dental plaster in direct casting of living tissue. However, the technique used here is also considered dangerous, as ordinary plaster-of-Paris under certain circumstances could also cause severe burns.

Adolescent↗
PubMed1982

Influence of the hip joint position on the intraosseous pressures in the juxta-articular bones. An experimental investigation in dogs.

In 6 mongrel dogs (eleven hips) the intraosseous pressure was measured in the femoral head as well as acetabulum in various hip joint positions. The control position for the measurements was 90 degrees flexion in which the pressures were found low and stable. The intraosseous pressure in both locations were subjected to consistent pronounced variations when the joint position was altered. In the femoral head, significant pressure increases (p less than or equal to 0.01) were found in maximal extension, maximal flexion, maximal adduction, 90 degrees external rotation, 45 degrees internal rotation, and maximal internal rotation. The pressure in acetabulum rose significantly in maximum flexion, 45 degrees internal rotation, and maximum internal rotation, whereas the pressure increase in maximal extension and maximum adduction was consistent but not significant. The pressure increase is most probably caused by inhibition of the venous drainage changing the bone hemodynamics in the juxta-articular bones. A complete obstruction of venous drainage was not observed since the intraosseous pressure in none of the measurements reached the level of the arterial pressure.

Acetabulum↗
PubMed1981

Intraosseous pressures in the knee in relation to simulated joint effusion, joint position, and venous obstruction. An experimental study in growing dogs.

The present study was performed in 9 mongrel puppies, 8-10 weeks old. Under anaesthesia simultaneous pressure registrations were taken from the distal femoral metaphysis, the distal femoral epiphysis, the proximal tibial epiphysis together with the arterial pressure. An intra-articular pressure increase resulted in a significant increase in the intraosseous pressure in the distal femoral epiphysis, while the pressures in the femoral metaphysis and tibial epiphysis remained unchanged. During maximal flexion of the empty joint a significant increase in femoral epiphyseal pressure was observed, while maximal extension resulted in a significant increase in tibial epiphyseal pressure. The presence of a moderate intra-articular effusion augmented these findings. By selective ligation of the venous drainage from the juxta-articular bones in the popliteal fossa and on the femur, different levels of epiphyseal hypertension could be produced. These pressure increases never reached the level of the arterial pressure. Thus they revealed only a partial impairment of the vascular circulation in the juxta-articular bones.

Animals↗
PubMed1981

The relationship between increasing intraarticular pressures and intraosseous pressures in the juxtaarticular bones. An experimental investigation in dogs.

The present experiment investigation of the relationship between intraarticular and intraosseous pressures was carried out in mongrel dogs. Under general anaesthesia simultaneous pressure measurements were performed in the femoral artery, the knee joint and the tibia and femur adjacent to the knee joint. The intraarticular pressure was increased by infusion of saline. Increase in the knee joint pressure caused an increase in the femoral intraosseous pressure, while the tibial intraosseous pressure remained unchanged. The pressure increase in the femur was most pronounced in dogs with intact epiphyseal plates. It is suggested that the rise in the femoral pressure was caused by compression of the venous drainage from the bone. Further evidence to support this suggestion was obtained from anatomical studies, intraosseous phlebography and experiments with selective venous compression.

Age Factors↗
PubMed1981

Trochanteric and subtrochanteric fractures. The operative results in a prospective and comparative study of Ender nailing and McLaughlin Osteosynthesis.

A comparative and prospective study was performed in order to evaluate the advantages or disadvantages of the Ender operation in comparison with the McLaughlin technique. The series included 145 patients, 72 operated by the Ender method, and 73 by the McLaughlin method. There were no differences between the two groups as regards anaesthesia time, operation time, mean stay in hospital, morbidity and mortality. Technical problems were encountered in 40 of the Ender operated fractures (56 per cent), whereas the figure for the patients treated with the McLaughlin method was 17 (23 per cent). Ten (14 per cent) patients in the Ender group but only 2 (3 per cent) in the McLaughlin group needed re-operation. Three deep infections occurred in the McLaughlin group, but non in the Ender group. It was concluded that the only advantage which could be demonstrated in the Ender group was a low infection rate. Many disadvantages were revealed, the most outstanding being the many technical problems encountered and the great number of re-operations required.

Adult↗
PubMed1981

Trochanteric and subtrochanteric fractures. One year follow-up of a prospective study of Ender and Mclaughlin osteosynthesis.

The clinical and social status of 110 patients with trochanteric and subtrochanteric fractures was evaluated in a prospective and comparative study 1 year after Ender or McLaughlin osteosynthesis. In both groups the mortality rate during the first year was 21 per cent. There were no significant differences between the two groups concerning pain, hip movement, walking ability of the social status of the patients. Of the 110 patients surviving the first year, 35 per cent were unable to walk, 20 per cent walked with a cane or crutches and 30 per cent had periodic pains in the hip or knee. About 20 per cent of the patients admitted from their own home now lived in nursing homes.

Aged↗
PubMed1981

Lateral ligament reconstruction of the ankle with a modified Watson-Jones operation.

A modified Watson-Jones technique, using only half of the peroneus brevis tendon, was applied as an operative procedure for lateral ankle instability. Twenty-nine patients with 30 operated ankles were examined with an average follow-up period of 7 years and 6 months. Functional stability was achieved in all but one of the operated ankles. In 15 cases there were periodic pains and swelling on activity, while the remaining 14 ankles were without symptoms. Supination of the foot was slightly decreased in 4 cases.

Adolescent↗
PubMed1980

Soft tissue interposition arthroplasty for osteoarthritis of the carpometacarpal joint of the thumb.

A soft tissue interposition arthroplasty for carpometacarpal osteoarthritis of the thumb is described. Thirty-seven joints in 32 patients were operated on. The results with regard to pain, strength and mobility are recorded. In 34 cases the patients reported considerable improvement after the operation and the majority of the patients could resume their usual work. Only minor complications occurred.

Adult↗
PubMed1979

Brachymesophalangy and loose bodies in the metacarpophalangeal joints.

A family with autosomal inherited brachymesophalangy is presented. Some of the family members also had loose bodies in the metacarpophalangeal joints. This condition is similar to osteochondritis in other joints. New loose bodies may be formed after operative removal and arthrotic changes may occur. The patients were not able to perform hard physical work with their hands.

Abnormalities, Multiple↗
PubMed1977

Uptake of peroxidase by calcitonin inhibited osteoclasts.

The present electron microscopic histochemical study demonstrates that osteoclasts from calcitonin treated bone are able to take up organic macromolecules even though the ruffled border has disapppeared. The absorption occurs around the entire periphery of the osteoclast, but the amount of absorbed peroxidase seems to be reduced in comparison with that of untreated cells. It is concluded that the effect of calcitonin on osteoclasts is primarily a cessation of the exocytosis and the concomitant disappearance of the ruffled border.

Animals↗