9 research outputs found
Effect of the Sc/Zr ratio on the corrosion resistance of Al-Mg cast alloys
The results of investigations of the corrosion resistance of Al-Mg-Sc-Zr
alloys with varying Mg content and different Sc/Zr ratios are presented. The
objects of investigations were the Al-Mg-Sc-Zr alloys with total Sc + Zr
content of 0.32 wt%. The concentration of Sc and Zr in the alloys varied with
the increments of 0.02 wt%. The alloys were produced by induction casting. The
effect of annealing temperature on the microhardness and electrical resistivity
of the Al-Mg-Sc-Zr alloys was investigated. Corrosion tests were carried out in
a medium simulating intergranular corrosion in aluminum alloys. Electrochemical
studies and mass loss tests were performed. An increase in the Sc concentration
and a decrease in the Zr one were shown to result in an increase in the
corrosion rate. The primary Al3(ScxZr1-x) particles were found to have the main
effect on the corrosion resistance of Al-Mg-Sc-Zr alloys. The dependence of the
corrosion current on the annealing temperature of the Al-Mg-Sc-Zr alloy was
found to have a non-monotonous character (with a maximum).Comment: 29 pages, 2 tables, 11 figures, 58 reference
Biochemical changes of synovial fluid in patients with osteoporosis of knee joint of various etiology
The aim of this study was to perform comparative analysis of biochemical composition of synovial fluid in patients with osteoarthrosis of various etiology. Studies were conducted on samples of synovial fluid of patients which were divided into two groups. Thefirstgroup consisted of 16 patients with patellofemoral arthrosis of the 2nd stage, the second group included 54 patients with bilateral gonarthrosis. The samples of synovial fluid of 11 cadavers of suddenly dead people of both sexes (4 men and 7 women) of 23-79 years who didn't have articular pathology registered by an expert were considered as a norm. Conducted study testifies significant imbalance of prooxidant and antioxidant processes in the synovial fluid and development of oxidative stress the intensity of which depends on the severity of the pathological process but is regardless to its etiology
Effect of severe plastic deformation realized by rotary swaging on the mechanical properties and corrosion resistance of near-a-titanium alloy Ti-2.5Al-2.6Zr
The research aims to analyze the impact that severe plastic deformation
arising during Rotary Swaging has on mechanical properties and corrosion
resistance of a near-a-titanium alloy Ti-2.5Al-2.6Zr (Russian industrial name
PT7M). The nature of corrosion decay in fine-grained alloys caused by hot salt
corrosion is known to vary from pit corrosion to intercrystalline corrosion at
the onset of recrystallization processes. Resistance to hot salt corrosion in a
fine-grained titanium alloy Ti-2.5Al-2.6Zr is shown to depend on the
structural-phase state of grain boundaries that varies during their migration
as a result of covering corrosive doping elements (aluminum, zirconium)
distributed in the crystal lattice of a titanium alloy.Comment: 37 pages, 15 figures, 39 reference
Evaluation parameters emg muscles of the lower extremities after HIP arthroplasty
Studied the functional state of the lower extremities muscles in patients with stage III coxarthrosis before hip replacement surgery and up to 1 year after. Revealed that the recovery of function in different muscle groups of the lower extremities after surgery is not the same. Overall, in the first few months after surgery, there is a decrease activity of most muscles. In terms of over one year, the amplitude of the bioelectric activity of the m. gastrocnemius lateralis, m. rectus femoris, m. biceps femoris, m. gluteus medius is returned to its original level and m. tibialis anterior and m. gluteus maximus above the original. Additionally these parameters are investigated in patients with aseptic loosening of the endoprosthesis, and in patients with stable prostheses. Revealed that patients with aseptic instability also have reduced amplitude EMG and bilaterally. After reoperation these indicators come back to initial level.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎΠ΅ ΡΠΎΡΡΠΎΡΠ½ΠΈΠ΅ ΠΌΡΡΡ Π½ΠΈΠΆΠ½ΠΈΡ
ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΡΡΠ΅ΠΉ Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ ΠΊΠΎΠΊΡΠ°ΡΡΡΠΎΠ·ΠΎΠΌ III ΡΡΠ°Π΄ΠΈΠΈ Π΄ΠΎ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ Π·Π½Π΄ΠΎΠΏΡΠΎΡΠ΅Π·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ°Π·ΠΎΠ±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΡΡΡΠ°Π²Π° ΠΈ Π² ΡΡΠΎΠΊΠΈ Π΄ΠΎ 1 Π³ΠΎΠ΄Π° ΠΏΠΎΡΠ»Π΅ Π½Π΅Π΅. ΠΡΡΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π²ΠΎΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΠ΅ ΡΡΠ½ΠΊΡΠΈΠΈ ΡΠ°Π·Π½ΡΡ
Π³ΡΡΠΏΠΏ ΠΌΡΡΡ Π½ΠΈΠΆΠ½ΠΈΡ
ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ Π½Π΅ΠΎΠ΄ΠΈΠ½Π°ΠΊΠΎΠ²ΠΎ. Π ΡΠ΅Π»ΠΎΠΌ Π² ΠΏΠ΅ΡΠ²ΡΠ΅ Π½Π΅ΡΠΊΠΎΠ»ΡΠΊΠΎ ΠΌΠ΅ΡΡΡΠ΅Π² ΠΏΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΠΎΡΠΌΠ΅ΡΠ°Π΅ΡΡΡ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π±ΠΎΠ»ΡΡΠΈΠ½ΡΡΠ²Π° ΠΌΡΡΡ. Π ΡΡΠΎΠΊΠΈ Π±ΠΎΠ»Π΅Π΅ 1 Π³ΠΎΠ΄Π° Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Π° Π±ΠΈΠΎΡΠ»Π΅ΠΊΡΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ m. gastrocnemius lateralis, Ρ . rectus femoris, Ρ . biceps femoris, m. gluteus medius Π²ΠΎΠ·Π²ΡΠ°ΡΠ°Π΅ΡΡΡ ΠΊ ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠΌΡ ΡΡΠΎΠ²Π½Ρ, a m. tibialis anterior ΠΈ Ρ . gluteus maximus ΠΏΡΠ΅Π²ΡΡΠ°Π΅Ρ ΠΈΡΡ
ΠΎΠ΄Π½ΡΠΉ ΡΡΠΎΠ²Π΅Π½Ρ. ΠΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π»ΠΈΡΡ ΡΡΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² Ρ Π°ΡΠ΅ΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΡΡ ΡΠ½Π΄ΠΎΠΏΡΠΎΡΠ΅Π·Π° ΠΈ Ρ ΠΏΠ°ΡΠΈΠ΅Π½ΡΠΎΠ² ΡΠΎ ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΡΠΌΠΈ ΠΏΡΠΎΡΠ΅Π·Π°ΠΌΠΈ. ΠΡΡΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ ΠΏΡΠΈ Π°ΡΠ΅ΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ ΡΠ°ΠΊΠΆΠ΅ ΠΎΡΠΌΠ΅ΡΠ°Π΅ΡΡΡ ΡΠ½ΠΈΠΆΠ΅Π½ΠΈΠ΅ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Ρ ΠΠΠ, ΠΏΡΠΈΡΠ΅ΠΌ Π±ΠΈΠ»Π°ΡΠ΅ΡΠ°Π»ΡΠ½ΠΎ. ΠΠΎΡΠ»Π΅ ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΈ ΡΠ΅ΡΠ½Π΄ΠΎΠΏΡΠΎΡΠ΅Π·ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠΈ ΠΏΠΎΠΊΠ°Π·Π°ΡΠ΅Π»ΠΈ Π²ΠΎΠ·Π²ΡΠ°ΡΠ°ΡΡΡΡ ΠΊ ΠΈΡΡ
ΠΎΠ΄Π½ΠΎΠΌΡ ΡΡΠΎΠ²Π½Ρ
Changes of biochemical parameters of blood serum and daily urine in patients with aseptic loosening of hip endoprosthesis
In order to study metabolic abnormalities in aseptic loosening of hip endoprosthesis performed biochemical analysis of blood serum and daily urine in 31 patients. Statistically significant changes in local and systemic metabolism are revealed, which are in the growth of osteolytic processes, hypoxia, antioxidant, and vitamin deficiency. Thereby, pathogenetic mechanisms of aseptic instability are studied, on the basis of the received facts recommendations about prevention of this complication are madeΠ‘ ΡΠ΅Π»ΡΡ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΡΠ΅ΡΠΊΠΈΡ
Π½Π°ΡΡΡΠ΅Π½ΠΈΠΉ ΠΏΡΠΈ Π°ΡΠ΅ΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ ΡΠ½Π΄ΠΎΠΏΡΠΎΡΠ΅Π·Π° ΡΠ°Π·ΠΎΠ±Π΅Π΄ΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΡΡΡΠ°Π²Π° ΠΏΡΠΎΠ²Π΅Π΄Π΅Π½ΠΎ Π±ΠΈΠΎΡ
ΠΈΠΌΠΈΡΠ΅ΡΠΊΠΎΠ΅ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠ²ΠΎΡΠΎΡΠΊΠΈ ΠΊΡΠΎΠ²ΠΈ ΠΈ ΡΡΡΠΎΡΠ½ΠΎΠΉ ΠΌΠΎΡΠΈ Ρ 31 ΠΏΠ°ΡΠΈΠ΅Π½ΡΠ°. ΠΡΡΠ²Π»Π΅Π½Ρ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈ Π·Π½Π°ΡΠΈΠΌΡΠ΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΌΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΈ ΡΠΈΡΡΠ΅ΠΌΠ½ΠΎΠ³ΠΎ ΠΌΠ΅ΡΠ°Π±ΠΎΠ»ΠΈΠ·ΠΌΠ°, Π·Π°ΠΊΠ»ΡΡΠ°ΡΡΠΈΠ΅ΡΡ Π² ΡΠΎΡΡΠ΅ ΠΎΡΡΠ΅ΠΎΠ»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ², Π³ΠΈΠΏΠΎΠΊΡΠΈΠΈ, Π°Π½ΡΠΈΠΎΠΊΡΠΈΠ΄Π°Π½ΡΠ½ΠΎΠΉ ΠΈ Π²ΠΈΡΠ°ΠΌΠΈΠ½Π½ΠΎΠΉ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΎΡΠ½ΠΎΡΡΠΈ. Π’Π°ΠΊΠΈΠΌ ΠΎΠ±ΡΠ°Π·ΠΎΠΌ, ΠΈΠ·ΡΡΠ΅Π½Ρ ΠΏΠ°ΡΠΎΠ³Π΅Π½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΡ Π°ΡΠ΅ΠΏΡΠΈΡΠ΅ΡΠΊΠΎΠΉ Π½Π΅ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ, Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
Π΄Π°Π½Π½ΡΡ
Π΄Π°Π½Ρ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΈ ΠΏΠΎ ΠΏΡΠΎΡΠΈΠ»Π°ΠΊΡΠΈΠΊΠ΅ Π΄Π°Π½Π½ΠΎΠ³ΠΎ ΠΎΡΠ»ΠΎΠΆΠ½Π΅Π½ΠΈΡ
Some Aspects of Total Hip Replacement with Subtrochanteric Shortening Osteotomy in Patients with Congenital Hip Dislocation (Review)
Total hip replacement (THR) in patients with a high congenital dislocation of the hip (Crowe type IV dysplasia in Crowe classification) is a technically difficult operation, associated with a high risk of complications. The most common variations of THRs used to restore the true center of rotation of the hip are subtrochanteric shortening osteotomy and proximal shortening osteotomy using the Paavilainen technique. Numerous publications refer to the technique and outcomes of subtrochanteric osteotomy, but fundamental differences of opinion persist on a number of points relating to the topic.The objective of the study is to analyze the publications on the treatment for crowe type IV hip dislocations using total replacement of the hip joint (HJ) with subtrochanteric shortening osteotomy.The hypothesis of the study was as follows: the method of fixation of the femoral component, the type of osteotomy and the design features of the implant (philosophy) are the factors that determine the effectiveness of the operation. The electronic databases eLIBRARY and PubMed were searched for publications containing keywords in Russian or English: high dislocation of the hip, total replacement of the Hj, shortening subtrochanteric osteotomy. As a result of the study, the proposed hypothesis was partially confirmed. There were only minor differences in the overall incidence of complications and the survivorship of implants when using different types of cementless stems. The incidence of non-unions after the installation of cemented femoral components was higher than with the implantation of cementless. We did not find convincing evidence of the advantage of the step-cut, V-shaped and oblique osteotomies compared with the transverse osteotomy. Typical complications for such operations were the nerve injuries, intraoperative hip fractures, dislocations and non-unions of the femur at the osteotomy site