ABSTRACT
Injury of gluteus medius muscle is a serious often complication after hip replacement surgery followed by pain, claudication and significant deterioration of the quality of life. Prevention of intraoperative injury of this muscle is especially relevant in young patients. Normal function of this muscle provides rapid rehabilitation and early postoperative recovery. However, hip replacement surgery through Hardinge's direct lateral approach is accompanied by fatty degeneration of gluteus medius muscle in 12-20% of cases. Moreover, two or more redo procedures lead to fatty degeneration of almost 70% of anterior and 40% of central muscular segment. Currently, there are many methods of surgical treatment of this complication including transosseous muscle fixation, endoscopic procedures, repair using Achilles tendon, gluteus maximus muscle, lateral head of quadriceps muscle and allografts. However, various publications devoted to this problem have certain disadvantages including short follow-up period, small sample size and often unsatisfactory outcomes. Therefore, the question of surgical repair of hip abductor function remains open.
Subject(s)
Arthroplasty, Replacement, Hip/adverse effects , Muscle, Skeletal/injuries , Muscle, Skeletal/surgery , Soft Tissue Injuries/surgery , Arthroplasty, Replacement, Hip/methods , Buttocks , Humans , Soft Tissue Injuries/etiologyABSTRACT
AIM: Experimental analysis of the strength properties of integration of muscle tissue, tendons and ligaments, bone tissue into titanium highly porous materials prepared by using of additive technologies. MATERIAL AND METHODS: The study included 9 mature rabbits of the Chinchilla breed. Both posterior paws and latissimus dorsi muscles (36 specimens) were used. Titanium models (Ti-6-Al-4-V, 'Rematitan', Germany) were made by additive technologies with preliminary prototyping, the prototypes had a highly porous mesh structure. RESULTS: It was developed experimental model of functional bone defect involving points of attachment of the muscle and ligaments. Strength of attachment of muscles to highly porous implants was 145 H vs. 31 H for standard models. Tensile strength for fixation to bone tissue was 84 H vs. 152 H in the main group. CONCLUSION: It was found integration of soft tissues and bones into highly porous titanium implants prepared with additive technologies. Fixation strength significantly exceeds that for standard models.
Subject(s)
Bone and Bones/surgery , Musculoskeletal System/physiopathology , Osseointegration/physiology , Prostheses and Implants , Wound Healing/physiology , Animals , Biocompatible Materials , Bone and Bones/injuries , Bone and Bones/physiopathology , Ligaments/physiopathology , Ligaments/surgery , Models, Animal , Muscle, Skeletal/physiopathology , Muscle, Skeletal/surgery , Porosity , Prosthesis Design , Prosthesis Implantation , Rabbits , Recovery of Function , Reoperation , Surgical Mesh , Tendons/physiopathology , Tendons/surgery , TitaniumABSTRACT
Karyotypes of 4 chironomid species were studied: Cryptochironomus obreptans Walker, Criptochironomus sp., Chironomus plumosus Linnaeus and Stictochironomus rosenscholdi Zetterstedt. All these species belong to the subfamily Chironominae. Each species is characterized by the specific karyotype structure. The first species in the list has 2n = 4, while the other 3 species have 2n = 8.
Subject(s)
Chironomidae/genetics , Karyotype , Polytene Chromosomes/chemistry , Animals , Chromosome Inversion , Italy , Karyotyping , Ploidies , Species SpecificityABSTRACT
The structural-functional variation of Chironomus riparius salivary gland polytene chromosomes was studied in two geographically isolated Palearctic regions, Bulgaria (village Pancharevo) and Russia (St. Petersburg). The two biotopes, where larvae were collected, were polluted with various heavy metals from anthropogenic sources. Hereditary paracentric heterozygous inversions were characteristic of the Russian population, whereas somatic paracentric or pericentric heterozygous inversions were more common in the Bulgarian one. All inversions occurred at low frequencies. Other aberrations found in the two populations included somatic deletions resulting in a pompon structure of chromosome IVG, heterozygous translocation between chromosomes IVG and IIIF, enlargement of individual disks, and the appearance of a heterozygous block close to the centromere of chromosome IVG. In addition, changes in functional activity of the nucleolus organizer and Balbiani rings (BRc/BRb) were observed. Several aberration breakpoints proved to coincide with satellites of the Alu and Hinf families.
Subject(s)
Chironomidae/genetics , Chromosomes , Salivary Glands/ultrastructure , Animals , Bulgaria , RussiaABSTRACT
PIP: The pro-natalist social policy that has been developed in Bulgaria is described. This policy focuses on the development and protection of the nuclear family unit and on the development of responsible attitudes toward marital and parental roles among young people. (SUMMARY IN ENG AND RUS)^ieng
Subject(s)
Attitude , Family Planning Policy , Public Policy , Behavior , Bulgaria , Developed Countries , Europe , Europe, Eastern , PsychologyABSTRACT
PIP: Problems associated with the aging of the population in Bulgaria are examined. Some basic features of the aging process in humans are described, and factors that determine the biological limits of life are considered. The need for social, economic, and demographic approaches to the issue of demographic aging is emphasized. (summary in ENG, RUS)^ieng