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Biomedical subjects

M Horst

Publications and source records attributed to M Horst.

At least 73 records · Page 4Linked to original sources
PubMed1978

[Contribution to capsular hemangioma of the knee joint (author's transl)].

Hemangioma of the knee joint capsule is rare. Although there are exact descriptions of the lesion to be found in the world literature, it is relatively unfamiliar among surgeons. Some characteristic symptoms as painful swelling, hemarthrosis, disappearance of swelling upon limb elevation, muscular atrophy, limitation of the knee motion, occasionally increased leg length or locking in circumscribed tumors and x-ray findings as osteolytic changes, periostal new bone formation and bony atrophy lead to the diagnosis. Phleboliths are pathognomonic. Another very characteristic case is added to the about 160 cases described in the world literature. Arthrography is helpful only in rare instances. Arteriography is critizised differently, but more frequently it is thought to be of diagnostic value. Arthroscopy does not lead any further in diffuse hemangioma. The treatment of choice is radical excision of the tumor whenever possible. In order to avoid secondary arthrotic changes early surgical intervention is favourable.

Adolescent↗
PubMed1977

[Contribution to the osteolysis in distal end of the clavicle (author's transl)].

A case of rare osteolysis of the distal clavicle end is reported. Our 36-years old male patients also suffered from a well-discernible Hyperlipoproteinemia, type II/a after Fredrickson. A short view of the various forms of clavicle osteolysis is given. Their differentialdiagnostical and ethiological relations are discussed.

Adult↗
PubMedDate not supplied

Risk of vertebral insufficiency fractures in relation to compressive strength predicted by quantitative computed tomography.

Vertebral insufficiency fractures may result from excessive loading of normal and routine loading of osteoporotic spines. Fracture occurs when the mechanical load exceeds the vertebral compressive strength, i.e., the maximum load a vertebra can tolerate. Vertebral compressive strength is determined by trabecular bone density and the size of endplate area. Both parameters can be measured non-invasively by quantitative computed tomography (QCT). In 75 patients compressive strength (i.e., trabecular bone density and endplate area) of the vertebra L3 was determined using QCT. In addition, conventional radiographs of the spines were analysed for the prevalence of insufficiency fractures in each case. By relating fracture prevalence to strength, three fracture risk groups were found: a high-risk group with strength values of L3 less than 3 kN (kilo Newton) and a fracture risk of 100%, an intermediate group with strength values from 3 to 5 kN and a steeply increasing risk with decreasing strength, and a low-risk group with strength values greater than 5 kN and a fracture risk near 0%. Biomechanical measurements and model calculations indicate that spinal loads of 3 to 4 kN at L3/4 will be common in everyday activities. These data and the results described above suggest that spines with strength values of L3 less than 3 kN are at an extremely high risk of insufficiency fractures in daily life. Advantages of fracture risk assessment by strength determination over risk estimation based on clinically used trabecular bone density measurements are discussed.

Adult↗
PubMedDate not supplied

[New instruments for the removal of an artificial hip joint from the shaft].

Two new instruments for the removal of intact of broken stems of artificial hip joints are described. The instruments and their application are illustrated in the figures 1-4. They produce a force along the longitudinal direction of the femur which breaks the metal to bone-cement bond. The use of these instruments reduces problems which may arise from fracture of the cortical bone of the femoral shaft or from an impairment of sterility.

Femur↗
PubMedDate not supplied

[Halo instrumentation for the correction and immobilization of the cervical spine].

An instrument set for application in patients requiring a correction treatment and/or a temporary fixation of the cervical spine is described. The halo is combined with a cast or a brace employing the 8 mm Hoffmann External Fixator system supplemented by three additional, newly designed parts. Applications of the instrument set in the treatment of traumatic fracture, fibrous dysplasia and ankylosing spondylitis are described.

Adolescent↗
PubMedDate not supplied

[Objective determination of the shape of the anterior chest wall using moiré topography. Method and development of dimension-free indices for the evaluation of funnel chest].

Stereophotogrammetric measurement of body surface results in data, which are dependent on shape, posture and positioning of the patient. In order to establish a valid description and characterization of funnel chest measured by stereophotogrammetric methods, index numbers must be defined, which are independent of posture und positioning of the patient. This procedure is exemplified in the analysis of moiré topograms from 29 patients with funnel chest and 21 normal persons. The sagittal cross section is characterized by the index TI I, which in essential is the sum of absolute values of angles in a polygon along the section (cf. fig. 7). The funnel in the coronal cross section is characterized by the index TI II, which gives the quotient (in %) of the mean funnel width and funnel depth (cf. fig. 8). Application of the index numbers shows a good differentiation of TI I, independent of sex, whereas TI II might be most useful in follow up measurements.

Adolescent↗
PubMedDate not supplied

[Late results of the surgical correction of funnel chest. Evaluation with subjective and objective criteria including moiré topography].

The long term results of 32 patients with funnel chest deformity that were operatively treated by means of Rehbein's metal implants have been reviewed. The investigated criteria were electrocardiography, pulmonary function, radiographical measurements, and photogrammetry of the frontal thoracic plane (Moiré-Topography). There was no significant change of the electrocardiography and pulmonary function due to the operative treatment. Roentgenometric and surface measurement data showed in 40% of the cases investigated minor up to complete relapses. According to the results the indications for operative treatment and the importance of the patient's age at this time are discussed.

Adolescent↗
PubMedDate not supplied

[A simple device for attaching a halo].

A fitting device is described which serves to adjust a halo; thus its application may be carried out by the surgeon alone without assistance. A modification of the device is described which may be used for fixation of a patient's head during surgery in the operating theater. With two exceptions all parts of the device are standard products of industrial or medical instrument manufacturers. Reference 4 lists these parts and describes the specially designed components. Thus, the device can easily be copied.

Humans↗
PubMedDate not supplied

1980 Volvo award in biomechanics. Measurement of the distribution of axial stress on the end-plate of the vertebral body.

The distribution of axial stress on the end-plate of the vertebral body has been measured by the aid of miniature piezoelectric pressure transducers in specimens of motion segments of the human vertebral column. The results indicate that the stress distribution depends essentially on the state of degeneration of the intervertebral disc and on the relative position of the adjacent end-plates. Furthermore lumbar and thoracic motion segments show a different behaviour. The measured results relate to the problem of the stress dependent deformation of the growing vertebra, the codfish shape of the osteoporotic vertebra and to the mechanism of degeneration of the intervertebral disc.

Adult↗
PubMedDate not supplied

Deformation of the vertebral end-plate under axial loading of the spine.

When the published data on the radial disc bulge in relation to the axial compression of the motion segment are compared to a simple mechanical model, it follows that an axial inward bulge of the vertebral endplates should occur during compression. The model predicts that the disc height at its center should remain practically constant under compression. The axial endplate bulge has been measured in specimens of the human lumbar spine by stereoroentgen-photogrammetric methods. The results confirm the prediction that the axial endplate bulge is comparable in magnitude to the linear compression of the motion segment. Axial endplate bulge and deformation of the underlying trabecular bone are thus important determinants for the compression characteristics of the human spine.

Humans↗