Robert Srnec

University of Veterinary and Pharmaceutical Sciences Brno, Brünn, South Moravian, Czech Republic

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Publications (23)16.42 Total impact

  • Acta Veterinaria Brno 01/2014; 83(1):55-60. DOI:10.2754/avb201483010055 · 0.45 Impact Factor
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    ABSTRACT: This study describes the results achieved using a combination of allogeneic mesenchymal stem cells (MSCs) with chondrocytes (CHC) and a new scaffold consisting of type-I collagen and chitosan nanofibers in the prevention of partial growth plate arrest after iatrogenic injury in pigs. The miniature pig was selected as an experimental model to compare the results in the left femoral bones (MSCs and CHC in scaffold transplantation into the iatrogenic partial distal growth plate defect) and right femoral bones (scaffold alone transplantation). The experimental group consisted of 10 animals. Bone marrow from os ilium as the source of MSCs was used. A porous cylinder consisting of 0.5% by weight type-I collagen and 30% by weight chitosan, was the optimal choice. The length of the bone and angular deformity of distal femur after the healing period was measured and the quality and structure of the newly formed cartilage was histologically examined. Transplantation of the composite scaffold in combination with MSCs and chondrocytes led to the prevention of growth disorder and angular deformity in the distal epiphysis of the left femur. Compared to the right (control) femur, tissue similar to hyaline cartilage with signs of columnar organization typical of the growth plate occurred in most cases. The promising results of this study reveal the new and effective means for the prevention of bone bridge formation after growth plate injury.
    Biomedical papers of the Medical Faculty of the University Palacky, Olomouc, Czechoslovakia 06/2012; 156(2):128-34. DOI:10.5507/bp.2012.041 · 1.66 Impact Factor
  • Acta Veterinaria Brno 01/2012; 81(4):415-420. DOI:10.2754/avb201281040415 · 0.45 Impact Factor
  • Acta Veterinaria Brno 01/2012; 81(2):211-215. DOI:10.2754/avb201281020211 · 0.45 Impact Factor
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    ABSTRACT: To quantify humeroulnar incongruity on elbow radiographs in Labrador Retrievers with or without medial coronoid disease (MCD). Retrospective study of 92 elbows. Radiographic projections of elbow joints from Labrador Retrievers with MCD (n = 42 elbows; 26 dogs) and without MCD (n = 50 elbows; 25 dogs). The congruity of the humeroulnar joint was measured using an index of subluxation (SI) for each elbow. SI was defined as the distance between the centers of 2 circles drawn along the margins of the incisura trochlearis and the trochlea of humerus on mediolateral digital radiographic projections, normalized by the radius of the circle circumscribing the humeral trochlea. SI was compared between right and left elbows with and without pathology using a Wilcoxon test for paired data, and between normal and abnormal groups with a Wilcoxon test for unpaired data. Mismatch between ulnar curvature and curvature of humeral trochlea and radioulnar incongruency were also noted (Wilcoxon test). The intraobserver repeatability, correlation between SI and radioulnar incongruency, and between SI and mismatch elbow curvature were estimated with a Pearson's correlation coefficient. Intraobserver repeatability of SI measurement was high (r = 0.97). Mean ± SD humeroulnar incongruity (SI) was greater in elbows with MCD (18.5 ± 6.6) than in the normal elbows (1.7 ± 2.0, P < 0.001). The difference between the diameters of the curvatures of the ulnar and humeral trochlea was greater in elbows with MCD (12.5 ± 4.4) than in the normal group (10.7 ± 4.1, P < 0.05). A moderate correlation was found between the degree of humeroulnar incongruity and a radioulnar step (r = 0.63); however, no correlation was identified between SI and the difference between the diameters of the curvatures of the ulnar and humeral trochleae (r = 0.14). We propose a radiographic index to measure humeroulnar incongruity on mediolateral digital radiographic projections. This index (SI) supports the presence of humeroulnar incongruity in Labrador Retrievers with MCD. Further evaluation of its reproducibility and clinical importance are warranted. Although there is a moderate correlation between humeroulnar incongruity and radioulnar incongruency, causation has not been established.
    Veterinary Surgery 10/2011; 40(8):981-6. DOI:10.1111/j.1532-950X.2011.00907.x · 0.99 Impact Factor
  • Acta Veterinaria Brno 01/2011; 80(4):401-405. DOI:10.2754/avb201180040401 · 0.45 Impact Factor
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    ABSTRACT: The study describes types, absolute and relative numbers of implant failures in flexible bridging osteosynthesis using a six-hole 3.5 mm titanium Locking Compression Plate (n = 9) or a five-hole LCP 4.5 mm titanium (n = 40) selected for the fixation of segmental ostectomy of femoral diaphysis in the miniature pig used as an in vivo model in a study on the healing of a critically sized bone defect using transplantation of mesenchymal stem cells combined with biocompatible scaffolds within a broader research project. Occasional implant failure was evaluated based on radiographic examination of femurs of animals 2, 4, 8, 12 and 16 weeks after surgery. When bone defect was stabilized using 3.5 mm LCP, in 6 cases (66.7%) the screw was broken/lost in the proximal fragment of the femur 2 weeks after implantation (n = 4) and 4 weeks after implantation (n = 2). In 4 cases of these, the implant failure was accompanied also by loosening of the screw in position 3 in the proximal fragment of the femur. During ostectomy stabilization with 4.5 mm LCP, in 3 cases (7.5%) LCP was broken at the place of the empty central plate hole (without inserted screw) at the level of the segmental bone defect. Compared to the six-hole 3.5 mm LCP, the five-hole titanium 4.5 mm LCP is more suitable implant for flexible bridging osteosynthesis of a critically sized segmental defect of femoral diaphysis in the miniature pig. The results of this study will allow reducing implant failures in time-and cost-demanding transplantation experiments focused on bone healing.
    Acta Veterinaria Brno 12/2010; 79(4):599-606. DOI:10.2754/avb201079040599 · 0.45 Impact Factor
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    ABSTRACT: At present, attention is focused on research into possibilities of healing large bone defects by the method of mini-invasive osteosynthesis, using implantation of biomaterials and mesenchymal stem cells (MSCs). This study evaluates the healing of segmental femoral defects in miniature pigs based on the radiological determination of the callus: cortex ratio at 16 weeks after ostectomy. The size of the formed callus was significantly larger (p < 0.05) in animals after transplantation of an autogenous cancellous bone graft (group A, callus : cortex ratio of 1.77 +/- 0.33) compared to animals after transplantation of cylindrical scaffold from hydroxyapatite and 0.5% collagen (group S, callus : cortex ratio of 1.08 +/- 0.13), or in animals after transplantation of this scaffold seeded with MSCs (group S + MSCs, callus: cortex ratio of 1.15 +/- 0.18). No significant difference was found in the size of callus between animals of group S and animals of group S + MSCs. Unlike a scaffold in the shape of the original bone column, a freely placed autogenous cancellous bone graft may allow the newly formed tissue to spread more to the periphery of the ostectomy defect. Implanted cylindrical scaffolds (with and without MSCs) support callus formation directly in the center of original bone column in segmental femoral ostectomy, and can be successfully used in the treatment of large bone defects.
    Acta Veterinaria Brno 12/2010; 79(4):607-612. DOI:10.2754/avb201079040607 · 0.45 Impact Factor
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    ABSTRACT: The aim of the study was to find the difference between actual and anticipated frequencies of individual types of FCP (fragmented coronoid process) in relation to the extent of radioulnar incongruity. We evaluated the radiographs of elbow joints (n = 135) of dogs (n = 77) with arthroscopically (n = 109) or arthrotomically (n = 26) proven fragmented coronoideus medialis ulnae. Radioulnar incongruity was classified as a congruent joint (0-0.5 mm), moderate incongruity (0.6-2 mm) and marked incongruity (> 2.1 mm). In elbow joints without radiologically identifiable radioulnar incongruity (0-0.5 mm) significantly higher occurrence of fissured PCM (processus coronoideus medialis) was found (p < 0.01). In elbow joints with pronounced radioulnar incongruity (> 2.1 mm) we found significantly higher occurrence of FCP with a dislocated fragment (p < 0.001). The results of this study suggest the possibility of using the assessment of radioulnar incongruity from radiographs of elbow joints in mediolateral projection for specifying the X-ray diagnosis of FCP with regard to the type of FCP lesion.
    Acta Veterinaria Brno 06/2010; 79(2):307-312. DOI:10.2754/avb201079020307 · 0.45 Impact Factor
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    ABSTRACT: The aim of the study was to find whether there is a difference in the optical density of the subtrochlear region of incisura trochlearis and in the region of processus coronoideus medialis ulnae in elbow joints with fragmented processus coronoideus and in healthy elbow joints of the Labrador retriever breed. We evaluated digital radiographs of elbows (n = 26) with arthroscopically or arthrotomically proven FCP and digital radiographs of healthy elbows (n = 28). A template was made on radiographs in the JiveX program (Visus Technology Transfer) demarcating individual regions of interest (ROI) in which median optical density was measured. For normalisation of median optical density data of individual ROI, median optical density of the caudal ulnar cortex was used. Elbow joints with fragmented processus coronoideus had a lower mean median optical density in the distal part of incisura trochlearis compared to healthy elbow joints. The lowest median optical densities were found in the region of processus coronoideus medialis and in the distal part of the trochlear notch of the ulna in the region of processus coronoideus lateralis. The biggest difference in median optical densities between elbows with FCP and healthy elbows was found in regions distant from the articular surface. In evaluation of the opacity of the trochlear notch of the ulna it is appropriate to assess the whole region of the proximal ulnar metaphysis from the articular surface to the caudal ulnar cortex.
    Acta Veterinaria Brno 06/2010; 79(2):299-306. DOI:10.2754/avb201079020299 · 0.45 Impact Factor
  • Acta Veterinaria Brno 01/2010; 79(3):475-480. DOI:10.2754/avb201079030475 · 0.45 Impact Factor
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    ABSTRACT: To compare the incidence of seizures in dogs with intervertebral disk disease after iopamidol or iomeprol myelography, and to assess whether the incidence of seizures differed between the 2 agents when severity of neurological deficits, location of cord compression, duration of anesthesia, site of myelogram, volume of contrast, and concentration of contrast were evaluated. Retrospective study. Veterinary teaching hospital. One hundred and sixty-one client-owned dogs with intervertebral disk disease. Subarachnoid injection of contrast medium. One hundred and sixty-one dogs with intervertebral disk disease were subjected to myelography using iopamidol (n=74) or iomeprol (n=87). Cranial myelography was performed in 31 dogs, caudal myelography in 125 and both cranial and caudal myelography in 5. Seizures occurred in 23 of 161 (14%) dogs. There was no significant difference overall between iopamidol and iomeprol myelography. However, in dogs with thoracolumbar disk extrusion and paraplegia, seizures occurred more frequently after caudal myelography using iopamidol compared with iomeprol. Both iomeprol and iopamidol are suitable for myelography in dogs. Iomeprol is recommended for caudal myelography in paraplegic dogs with thoracolumbar disk extrusion due to the higher incidence of seizures in this group when iopamidol was used.
    12/2009; 19(6):611-6. DOI:10.1111/j.1476-4431.2009.00479.x
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    ABSTRACT: This synoptic study gives a concise overview of current knowledge of bone healing, the role of mesenchymal stem cells in bone tissue regeneration and contemporary possibilities of supporting regeneration of damaged bone. Attention of research concerning the healing of fractures with extensive loss of bone tissue following trauma, the treatment of belatedly healing or non-healing fractures or the healing of segmental bone defects following tumour resection, is focused on development of three-dimensional scaffolds planted with mesenchymal stem cells that might be used for reconstruction of such large bone lesions. Presented are possibilities of transplantation of mesenchymal stem cells combined with biomaterials into bone defects, including the results of our own experimental studies dealing with the use of stem cells in the treatment of damaged tissues of the musculoskeletal system in animal models.
    Acta Veterinaria Brno 12/2009; 78(4):635-642. DOI:10.2754/avb200978040635 · 0.45 Impact Factor
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    ABSTRACT: Synthesis and characterization of biodegradable hydrogels based on collagen modified by addition of synthetic biodegradable copolymer intended for preparation of porous scaffolds for mesenchymal stem cells used for possible implantation to animals with articular surface defects was investigated. The synthetic biodegradable tri-block copolymer used was the block copolymer of polyethylene glycol (PEG), polylactic acid (PLA), polyglycolic acid (PGA) (PEG-PLGA) endcapped with itaconic acid (ITA). The water-soluble carbodiimide and N-hydroxysuccimide system (EDC-NHS) was chosen as the cross-linking agent used to control the rate of hydrogel resorption. Dependence of the physical properties of the prepared hydrogels on the concentration of the EDC-NHS cross-linker, reaction time and concentration of PEG-PLGA-ITA copolymer was examined. Swelling behaviour, thermal stability, surface morphology and degradation rate were also characterized. Based on the obtained results, it can be concluded that increase in concentration of the cross-linking agent, as well as prolonged cross-linking time and increased amount of synthetic copolymer lead to enhanced thermal stability of the gels together with a reduced swelling ratio and degradation rate in saline. The resorption rate of these gels used in preparation of cartilage scaffolds can be controlled over a wide time interval by varying the collagen/(PEG-PLGA-ITA) blend composition or the conditions of the cross-linking reaction.
    Acta Veterinaria Brno 12/2009; 78(4):643-648. DOI:10.2754/avb200978040643 · 0.45 Impact Factor
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    ABSTRACT: The aim of this study was to evaluate macroscopically, histologically and immunohistochemically the quality of newly formed tissue in iatrogenic defects of articular cartilage of the femur condyle in miniature pigs treated with the clinically used method of microfractures in comparison with the transplantation of a combination of a composite scaffold with allogeneic mesenchymal stem cells (MSCs) or the composite scaffold alone. The newly formed cartilaginous tissue filling the defects of articular cartilage after transplantation of the scaffold with MSCs (Group A) had in 60 % of cases a macroscopically smooth surface. In all lesions after the transplantation of the scaffold alone (Group B) or after the method of microfractures (Group C), erosions/fissures or osteophytes were found on the surface. The results of histological and immunohistochemical examination using the modified scoring system according to O'Driscoll were as follows: 14.7+/-3.82 points after transplantations of the scaffold with MSCs (Group A); 5.3+/-2.88 points after transplantations of the scaffold alone (Group B); and 5.2+/-0.64 points after treatment with microfractures (Group C). The O'Driscoll score in animals of Group A was significantly higher than in animals of Group B or Group C (p<0.0005 both). No significant difference was found in the O'Driscoll score between Groups B and C. The treatment of iatrogenic lesions of the articular cartilage surface on the condyles of femur in miniature pigs using transplantation of MSCs in the composite scaffold led to the filling of defects by a tissue of the appearance of hyaline cartilage. Lesions treated by implantation of the scaffold alone or by the method of microfractures were filled with fibrous cartilage with worse macroscopic, histological and immunohistochemical indicators.
    Physiological research / Academia Scientiarum Bohemoslovaca 11/2009; 59(4):605-14. · 1.49 Impact Factor
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    ABSTRACT: This study appears from an experiment previously carried out in New Zealand white rabbits. Allogenic mesenchymal stem cells (MSCs) were transplanted into an iatrogenically-created defect in the lateral section of the distal physis of the left femur in 10 miniature pigs. The right femur with the same defect served as a control. To transfer MSCs, a freshly prepared porous scaffold was used, based on collagen and chitosan, constituting a compact tube into which MSCs were implanted. The pigs were euthanized four months after the transplantation. On average, the left femur with transplanted MSCs grew more in length (0.56+/-0.14 cm) compared with right femurs with physeal defect without transplanted MSCs (0.14+/-0.3 cm). The average angular (valgus) deformity of the left femur had an angle point of 0.78 degrees , following measurement and X-ray examination, whereas in the right femur without transplantation it was 3.7 degrees. The initial results indicate that preventive transplantation of MSCs into a physeal defect may prevent valgus deformity formation and probably also reduce disorders of the longitudinal bone growth. This part of our experiment is significant in the effort to advance MSCs application in human medicine by using pig as a model, which is the next step after experimenting on rabbits.
    Physiological research / Academia Scientiarum Bohemoslovaca 01/2009; 58(6):885-93. · 1.49 Impact Factor
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    ABSTRACT: The aim of the study was to verify whether there is a difference in the lengthwise growth of the femurs and in their angular deformity when comparing preventive vs. therapeutic transplantation of allogeneic mesenchymal stem cells (MSCs) to an iatrogenic defect in the distal physis of femur. Modified composite chitosan/collagen type I scaffold with MSCs was transplanted to an iatrogenically created defect of the growth cartilage in the lateral condyle of the left femur in 20 miniature male pigs. In Group A of animals (n = 10) allogeneic MSCs were transplanted immediately after creating the defect in the distal physis of femur (preventive transplantation). In Group B of animals (n = 10) the same defect of the growth cartilage was treated by transplantation of allogeneic MSCs four weeks after its creation (therapeutic transplantation), after the excision of the bone bridge that had formed in it. On average, left femurs with a damaged distal physis and preventively transplanted allogeneic MSCs (Group A) grew during 4 months from transplantation by 0.56 ± 0.44 cm more than right femurs without the transplantation of MSCs, whereas left femurs with physeal defects treated with a therapeutic transplantation of allogeneic MSCs (Group B) by 0.14 ± 0.72 cm only, compared to right femurs without transplanted MSCs. Four months after preventive transplantation of MSCs (Group A), valgus deformity of the distal part of left femur with the defect was 0.78 ± 0.82°; in the control group (right femur in the same animal without MSCs transplantation) it was 3.7 ± 0.82°. After therapeutic transplantation of MSCs (Group B) 0.6 ± 3.4°, in the control group (right femur in the same animal without MSCs transplantation) it was 2.1 ± 2.9°. In all the animals of Groups A and B, the presence of newly formed hyaline cartilage was confirmed histologically and immunohistochemically. In the distal physis of right femurs with an iatrogenic defect of the growth cartilage without the transplantation of MSCs (control) bone bridge was formed. Preventive transplantation of allogeneic MSCs into the defect of the distal growth zone of femur appears more suitable compared to the therapeutic transplantation, with regard to the more pronounced lengthwise bone growth. Differences found in the extent of valgus deformity were non-significant comparing preventive and therapeutic transplantations of MSCs. MSCs, growth plate, deformity, bone bridge Injury of the growth cartilage of the long bones of the extremities usually leads to the formation of a bone bridge between epiphysis and metaphysis of the long bone (Key and Ford 1958; Bright 1974). At the same time, in approximately 25 - 30% of cases the lengthwise bone growth is reduced and its angular deformity occurs (Ahn et al. 2004). Besides, in 10% of these cases, the function of the relevant joint is impaired (Mann and
    Acta Veterinaria Brno 01/2009; 78(2):293-302. DOI:10.2754/avb200978020293 · 0.45 Impact Factor
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    ABSTRACT: The aim of this experimental study on New Zealand's white rabbits was to find differences in the results of treating the distal physeal femoral defect by the transplantation of autologous or allogeneic mesenchymal stem cells (MSCs). After the excision of a created bone bridge in the distal physis of the right femur, modified composite scaffold with MSCs was transplanted into the defect. In animal Group A (n = 11) autogenous MSCs were implanted; in animal Group B (n = 15) allogeneic MSCs were implanted. An iatrogenic physeal defect of the left femur of each animal not treated by MSCs transplantation served as control. The rabbits were euthanized four months after the transplantation. The treatment results were evaluated morphometrically (femoral length and valgus deformity measurement) and histologically (character and quality of the new cartilage). Four months after the transplantation, the right femurs of the animals in Group A were on average longer by 0.50 +/- 0.04 cm (p = 0.018) than their left femurs, the right femurs of rabbits in Group B were on average longer by 0.43 +/- 0.01 cm (p = 0.028) than their left femurs.4 months after the therapeutic transplantation of MSCs valgus deformity of the distal part of the right femur of animals in Group A was significantly lower (by 4.45 +/- 1.86 degrees ) than that of their left femur (p = 0.028), in Group B as well (by 3.66 +/- 0.95 degrees than that of their left femur p = 0.001). However, no significant difference was found between rabbits with transplanted autogenous MSCs (Group A) and rabbits with transplanted allogeneic MSCs (Group B) either in the femur length (p = 0.495), or in its valgus deformity (p = 0.1597). After the MSCs transplantation the presence of a newly formed hyaline cartilage was demonstrated histologically in all the animals (both groups). The ability of transplanted MSCs to survive in the damaged physis was demonstrated in vivo by magnetic resonance, in vitro by Perls reaction and immunofluorescence. The transplantation of both autogenous and allogeneic MSCs into a defect of the growth plate appears as an effective method of surgical treatment of physeal cartilage injury. However, the Findings point to the conclusion that there is no clear difference in the final effect of the transplantation procedure used.
    BMC Biotechnology 10/2008; 8:70. DOI:10.1186/1472-6750-8-70 · 2.59 Impact Factor
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    ABSTRACT: Changes of Vital Parameters after Administration of Butorphanol during Tiletamine-Zolazepam-Ketamine-Xylazine Anaesthesia for Joint Surgery in Miniature Pigs. Acta Vet. Brno 2008, 77: 251-256. The study compares the effects of butorphanol in pigs undergoing joint surgery in tiletamine-zolazepam-ketamine-xylazine (TKX) anaesthesia. A total of 12 pigs were divided into 2 groups by 6 animals -BUT (anaesthetized with TKX combination and butorphanol) and CON (control group -anaesthetized with TKX combination only). All pigs were sedated with a mix of tiletamin-zolazepam-ketamin-xylazin, put into total anaesthesia using propofol, and connected to an anaesthesiology unit (O 2 -Air). For 40 min we logged the heart rate (HR), respiratory rate (RR), mean arterial pressure (MAP), haemoglobin saturation by oxygen (SpO 2) and end-tidal CO 2 concentration (ETCO 2) values. Ten minutes after connecting to the devices, the pigs in the BUT group were intravenously administered butorphanol (0.2 mg/kg) in the total volume of 2 ml, or physiological saline in the same volume. The pigs in the BUT group had a lower (p < 0.05) HR in 5 th , 10 th and 25 th min, and a lower RR in the 10 th , 15 th and 20 th min. MAP, ETCO 2 and SpO 2 values did not differ substantially. Butorphanol can thus be identified as a suitable analgesic TKX supplement to anaesthesia of miniature pigs with minimum effect on vital functions.
    Acta Veterinaria Brno 06/2008; 77(2). DOI:10.2754/avb200877020251 · 0.45 Impact Factor
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    ABSTRACT: Articular cartilage trauma, in particular due to its poor healing potential remains a complicated problem in both the adult and paediatric traumatology and orthopedics. In older patients, total endoprosthesis of the joint is a method of choice, however, in younger patients, the situation remains more complicated. In case of osteochondral lesions (arthrosis, chondral fractures. osteochoodrosis dissecns) the ideal management should result in complete recovery of the hyaline cartilage on the traumatized joint surface. Contemporary medicine uses some therapeutic procedures resulting in partial recovery of the articular cartilage structure at the lesion site and several techniques of excisionining the articular surface's injured part and of transplantations of biological grafts. Regarding the above first approach, abrasive methods (micro fractures, small drill holes), which are expected to result in recovery of the articular cartilage through progenitor cells that migrate from the bone marrow to the defect site following subchondral fracturing. In case the injury is managed early, the osteochondral fragment may be fixed and the articular congruence be recovered. Mosaicoplasty using osteochondral auto grafts or other autologous grafts, or more recently using transplantations of autologous chond rocytes, which seem to have a major potential in the hyaline cartilage healing process. However, methodology of the transplant retention at the defect site remains a problem. Furthermore, the use of mesenchymal stem cells, so far in the experimental phase, appears prospective. Pivotal articular cartilage treatment research activities have progressed to a level of searching for a suitable scaffold of perfect qualities. This is the task for cooperation with bioengineering. requiring provision of the most exact differentiation protocol for hyline cartilage producing mesenchymal stem cells (MSCs).
    Rozhledy v chirurgii: měsíčník Československé chirurgické společnosti 02/2008; 87(1):42-5.

Publication Stats

62 Citations
16.42 Total Impact Points

Institutions

  • 2007–2012
    • University of Veterinary and Pharmaceutical Sciences Brno
      • Faculty of Veterinary Medicine
      Brünn, South Moravian, Czech Republic
  • 2008
    • University Hospital Brno
      • Department of Pediatric Surgery, Orthopedics and Traumatology
      Brno, South Moravian Region, Czech Republic
    • Brno University of Technology
      • Institute of Materials Chemistry "IMC"
      Brünn, South Moravian, Czech Republic