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Zastosowanie pierscieni kompozytowych w budowie aparatu Ilizarowa u malych zwierzat

100%
Szponder T., Silmanowicz P., Chlopek J., Wajler C.
Medycyna Weterynaryjna
|
2003
|
tom 59
|
nr 02
150-153
2

Właściwości mechaniczne istoty zbitej kości pęcinowej koni

100%
Turek B., Wajler C., Klos Z., Szara T.
Medycyna Weterynaryjna
|
2013
|
tom 69
|
nr 02
The modulus of elasticity for the cortical bone in horses presented in the literature ranges between 1.75 and 20 GPa. The aim of the study was to determine the mechanical properties of the cortical bone of the proximal phalanx in horses in the three-point-bending test. Material and methods: The cortical bone was obtained from 10 horses (40 bones), both male and female, aged between 2-15 years. Bones were collected within 24 hours post mortem, dissected free of soft tissues, and then wrapped in plastic bags to prevent drying, and stored at -20 degrees Celsius. For the investigation, rectangular pieces of cortical bone were taken from the dorsal part of the bone. To determine the mechanical properties of the cortical bone the three-point-bending test was performed using the universal testing machine (Zwick 1435). All specimens were loaded with speed 2 mm/min to failure. During the testing procedure the following parameters were determined: maximum force, strength for bending, deformation for maximum force, modulus of elasticity and destroying work. Results and discussion: During investigation, the cortical bone from the dorsal part of the bone was exclusively tested because of its clear development. Mean values estimated during the tests were as follows: the modulus of elasticity 3.41GPa, maximum force (Fmax) 605.32N, deformation for Fmax 1.59 mm, strength for bending 110.61 MPa, destroying work 0.32Nm. Most of the bones used during the investigations were collected from horses of unknown breed killed in slaughter houses. Bones were collected only from healthy horses older than 2-years-of-age. Due to the lack of information about the breed, use of the horse and its feeding, determining the influence of these factors on the results was not possible. The dispersion of the results were significant and ranged for the elastic modulus between 1.37-6.66 GPa. An explanation for this can be the factor of using bones from different horses from different conditions like age, feeding, training, etc. Conclusions: Results of the elastic modulus achieved in our test are lower than the ones in horses and humans for long bones, which ranged between 16 and 20 GPa.
3
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Biomechanical study in vitro on the use of self-designed external fixator in diaphyseal III metacarpal fractures in horses

76%
Turek B., Potynski A., Wajler C., Szara T., Czopowicz M., Drewnowska O.
Polish Journal of Veterinary Sciences
|
2015
|
tom 18
|
nr 2
Diaphyseal fractures of the III metacarpal bone represent 22% of all fractures of the long bones in horses. Treatment of such cases is difficult. The most popular solution used in these types of fractures is two plates applied directly to the bone surface, but they are not applicable on contaminated and infected fractures. External fixators are quite commonly used in human medicine, although in veterinary practice there is no typical stabilizer designed for the treatment of diaphyseal fractures of the III metacarpal bone so far. In this study, an external semicircular fixator of our own design was used and in vitro strength tests were conducted to determine the maximum force which would lead to the destruction of non-fractured bone and fractured bone treated with the stabilizer. On the basis of the strength tests, we can conclude that the stabilizer can be strong enough to allow the horse to stand up after surgery. It also has many favorable features which make it easy to assemble and to take care of a wound, while being safe enough for the animal at the same time
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