The selection of pins with intramedullary osteosynthesis of bones peripheral skeleton cats

 

(57) Abstract:

The invention relates to veterinary medicine and can be applied for the selection of pins with intramedullary osteosynthesis of bones peripheral skeleton cats. Conduct research into age groups at two months of age and up to two years in the life of cats. The interval between age periods up to four months of age is 15 days, and with four months to two years of life, this interval is 30 days. Dissect these intervals bone peripheral skeleton with soft tissue and measure the length of the bones, bone-marrow channel of the epiphysis through which provides for the withdrawal of the pin from the bone, and the minimum diameter of the bone medullary canal, which is measured metal spokes with different diameter by introducing them into the bone marrow canal along its entire length. Comply with the conditions of the dense occurrence of the spokes in the medullar channel and the impossibility of introducing her with a diameter larger by 0.1 mm, the Method allows to increase the effectiveness of osteosynthesis by selection of the parameters of pins for a particular bone at a certain age. table 2.

The invention relates to veterinary surgery, namely the performance of the x2">Known pins for open and closed intramedullary osteosynthesis of the tibia and humerus of man. It is semi-oval in cross section pins with a diameter of 8-13 mm [1].

Also known pins for fixation of the forearm [1]. Pins similar to the pins described above. However, their cross section is V-shaped and the diameter from 4 to 8 mm

Selection pins when performing x-rays of the bones gives a distorted image of the bone on average 10% [1].

The main disadvantage of the above pins for osteosynthesis is that the pins in both cases does not apply to animals. When using medical pins for operations on the bones of animals can cause various complications, such as longitudinal split bone or further razbaltyvaniya pin during repair of bone.

The objective of the invention is the reduction of injuries of the bones and tissues surrounding them, simplifying the operation process of osteosynthesis, improving the efficiency of operations and the treatment by selection of the parameters of the pins on their length and diameter for a particular bone of cats at a certain age in a certain way osteosynthesis.

The task gasteropelecidae skeleton cats, according to the invention the research carried out by age groups at two months of age and up to two years in the life of cats, the interval between age periods up to four months of age is 15 days, and with four months to two years of life, this interval is 30 days. In these intervals the bones of the peripheral skeleton dissect from soft tissue and measure the length of the bones, bone-marrow channel of the epiphysis through which provides for the withdrawal of the pin from the bone. Measure the minimum diameter of the bone-marrow channel: measurement conducting metal spokes with different diameter by introducing them into the bone marrow canal along its entire length, observing the conditions of the dense occurrence of the spokes in the bone-marrow channel and the impossibility of introducing her with a diameter larger by 0.1 mm

The study was conducted in the period 2000-2003, based on the diagnostic and treatment veterinary center, Orel state agrarian University. To produce offspring and the formation of the age groups of cats were selected with the assistance of the breeders of cat club “Felis” , eagle clinically healthy animals counterparts in phenotype in accordance with the standards of the European korotkoe their offspring were kept in the same zoo-hygienic conditions. Throughout the studies were conducted monitoring of the physiological state of animals.

The research was conducted in age groups from 2 to 4 months of life when the interval between the age groups of 15 days. After four months of age up to one year of life of cats interval between age groups was 30 days. And at the age of 720 days were completed research, as in this age practically ends with the formation of the skeleton, and further changes in the skeleton cats are insignificant (table. 1).

In each age group were studied 4-6 animals counterparts, with the average data of fatness, body weight and measurements in the indicated age interval. The bones of a peripheral section of the skeleton cats carefully preparirovali from soft tissue using a scalpel. Linear measurements of the bones was performed by calipers with precision of up to 1.0 mm. Among the linear parameters were studied: length of the bone, the long bone medullary canal, the length of the epiphysis through which provides for the removal of the pin. So, for humeral, femoral and tibial bones were taken proximal epiphyses. For the rest - distal. The choice of the epiphyses came from min the IDT medullary canal, which was measured by means of metal spokes with different diameter by injection into the bone marrow canal along its entire length. Testimony was considered to be removed correctly when the dense occurrence of the workpiece in the bone-marrow channel and the impossibility of introducing a workpiece larger diameter of 0.1 mm of the Workpiece was measured with a micrometer with an accuracy of 0.1 mm

All studies and mathematical processing parameters of the pins was carried out according to the requirements of statement of a scientific experiment.

Example 1 of the method. European Shorthair cat breed at the age of five months live weight of 2.1 kg was admitted to the hospital with a diagnosis of diaphyseal fracture with displacement of the femur of the right leg. The diagnosis is confirmed radiographically. Was a combination of fragments and give them the correct anatomical position according to the standard technique of intramedullary osteosynthesis with the introduction of the pin from the top of the proximal epiphysis of the bone. Fixation of bone fragments was carried out with a metal pin made in the form of spokes, made the medical industry. This pin was machined and fitted to the parameters obtained from the it point of epiphysis cats [2]. Its length is equal 73,0 mm, and the diameter of 3.9 mm

Example 2 of the method. European Shorthair cat breed at the age of five months live weight of 1.9 kg was admitted to the hospital with a diagnosis of the diaphyseal femur fractures of both legs with a partial shift of fragments. The diagnosis is confirmed radiographically. To reduce injuries of the articular surfaces and the possible exception of limited joint mobility of the bones of both legs was performed intramedullary osteosynthesis method with the introduction of the pin into the bone marrow canal on the lateral side of the bone [2]. Fixation of bone fragments was carried out with a metal pin made in the form of spokes, made the medical industry. This pin was machined and fitted to the parameters obtained with the proposed method of selection pins for intramedullary method of osteosynthesis of the femur with the introduction of the pin on the side of the bones of cats. Its length is equal to 60.0 mm and a diameter of 3.9 mm

The conducting pins of the data parameters in the bone-marrow channel of the damaged bones in both methods of fixation was made without difficulty, as was observed diameter of the pins, however, they pushed xtify protrudes from the bones of 3.0-4.0 mm, enough to commit them to extract from the bones after the period of reparation. Function bearing on the injured limb in the operated animals partially recovered on the fourth day after surgery, and a fully - on the tenth day. Callus was formed on the 28th day after the operation, which was confirmed radiographically. On the 28th day after the operation, the pins were removed from the bones. Animals recovered.

As a result of application of the proposed method of selection pins were obtained parameters for intramedullary osteosynthesis of bones in two ways: with the introduction of the pin into the bone marrow canal of the bone from the top of the epiphysis and side bones. For each of the 14 age groups was obtained on 13 parameters of pins for different peripheral bones of the skeleton. All along the length of the pins for the two methods intramedullary osteosynthesis received 364 parameter. The diameter of the pin, which is the same for both methods intramedullary osteosynthesis - 182 parameter. For example, the length of the pin to the humerus when the intramedullary osteosynthesis method with the introduction of the pin from the top of the epiphysis at the age of two months is equal to 50.0±0.05 mm, when BB is at the age of two when osteosynthesis of this bone with the introduction of the pin from the top of the epiphysis its length will be equal 85,0±0.13 mm, side 77,0±0.13 mm, when the diameter of the pins for both methods of osteosynthesis 3,6±0,07 mm error in the measurements in all cases was less than 5%.

In veterinary medicine there is currently no similar data for any species of animal. Practicing veterinary doctors use bone pins, manufactured medical industry. During the use of pins, not adapted for animals and especially for specific types of possible further injury damaged bone, for example a longitudinal split of the bone with the use of the pin of larger diameter, razbaltyvaniya pin in the postoperative period, if you have set the pin of smaller diameter, difficulty with the fit of the pin along the length of the synthesized bone and so on

The pins can be made of a material used in medicine and requiring their removal from the bone after the period of reparation, but also can be absorbable. The parameters of the pins are for cats and can be offered for all kinds of animals and birds.

The present invention allows to manufacture pins any known form for a particular bone at a certain age cats etc what about the proposed method, reduces injuries and simplifies the operation, which greatly increases its effectiveness.

The pins selected by the proposed method was successfully applied for the osteosynthesis of bone peripheral skeleton cats on the basis of the diagnostic and treatment veterinary center eagle RAY. Their use eliminates the repeated operations to correct defects after fusion of fragments, in addition, a number of qualitative operations in 1.4 times higher compared to the number of operations with the use of medical pins. The pins of the proposed parameters were also applied in the Orel regional veterinary station, Chuvash Republican veterinary station, OJSC KSK Bitsa, Moscow and other Russian clinic.

Sources of information

1. Okhotsk B. N., Suvalan A., Intramedullary osteosynthesis solid metal pins. Moscow: Medicine, 1988, S. 32-33, 41 prototype.

2. Eliseev, A. N. Disease of dogs. Moscow: Rosagropromizdat, 1988, S. 174-175.

The selection of pins with intramedullary osteosynthesis of bones peripheral skeleton cats, which consists in the study of bone growth peripheral skeleton cats, characterized in that IP is al between age periods up to four months of age is 15 days, and with four months to two years of life, this interval is 30 days and in these intervals bone peripheral skeleton dissect from soft tissue and measure the length of the bones, bone-marrow channel of the epiphysis through which provides for the withdrawal of the pin from the bone, and the minimum diameter of the bone medullary canal, which is measured metal spokes with different diameter by introducing them into the bone marrow canal along its entire length, observing the conditions of the dense occurrence of the spokes in the bone-marrow channel and the impossibility of introducing her with a diameter larger by 0.1 mm



 

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