ABSTRACT
Objective To compare their competence to repair peripheral nerve defect between lami-na propria glial cells and olfactory bulb glial cells. Methods Glial cells in nasal lamina propria and olfac-tory bulb had been cultured in vitro for 2 weeks, then purified and condensed for later transplantation. 60 adult wistar rats were randomized into three groups of 20 rats each: A (control), B (glial cells in olfactory bulb were transplanted into epineuria lumen) and C (glial cells in lamina propria were transplanted into epineuria lumen). Rats' left sciatic nerves were excised 25 mm long axons and retained epineuria lumen anastomosed to proximal ends. Culture mediums, glial cells in olfactory bulb and in lamina propria were transplanted into epineuria lumen of A, B, and C groups respectively. At 3 months postoperative,the regeneration of injured sciatic nerves were evaluated by methods of gross observation, microscopy, transmission electron microscopy, the retrograde fluorescence gold, the immunofluorescence assay of glial fibre acid protein and nerve growth factors, the enzyme linked immunoassay of myelin basic protein and neurofilament protein, and the extremity function scores. Results The regeneration of injured sciatic nerve and the function of injured limbs were su-perior in C group to in B group and in A group. The transportation distance of retro-marked fluorescence red and the concentrations of glial fibre acid protein, nerve growth factors, myelin basic protein and neurofila-ment protein in injured sciatic nerve were high in C group, middle in B group, and low in A group. The dif-ference between groups had statistical significance. Conclusion Olfactory ensheathing cells could repairinjured nerve defect and the competence that the olfactory cells in lamina propria were superior to in olfacto-ry bulb.
ABSTRACT
It is a key technique of C-arm based surgical navigation to recognize circular objects and extract their geometric data from XRII images. Previous methods possess low detecting & extracting accuracy and low reliability. In this paper, we proposed a hybrid object detecting algorithm. Firstly, an improved Circle Hough Transform (CHT) was used to obtain the accumulative space, and the section of the space was used to acquire a binarized image. Secondly, connected component analysis method was used to recognize circular objects and extract their areas and center coordinates. In the improved CHT, mask and integral operator were redefined. In the connected component analysis, a new circle measurement was used. Results of the study showed that the proposed algorithm possesses high detecting ratio, high detecting accuracy, and reliability.
ABSTRACT
Objective To compare olfactory ensheathing cells (OECs) and Schwann cells (SCs) in respect of their abilities to repair nerve defects. Methods OECs and SCs were cultured in vitro for 2 weeks before they were purified and condensed for later transplantation. Sixty adult female Wistar rats were randomized into 3 even groups. After a 25 mm length of axons was excised but the epineurial lumen was re-tained, the left sciatic nerves were anastomosed to the proximal ends. Cell culture medium, SCs and OECs were transplanted into the epineurial lumen in A, B, C groups respectively. Three months postoperatively, regeneration of the injured sciatic nerves was evaluated by gross observation, microscopy, transmission elec-tron microscopy, transportation distance of retro-marked fluorescence red, immunofluorescence assay of the glial fiber acid protein and nerve growth factors, enzyme linked immunoassay of myelin basic protein and neurofilament protein, as well as ankle function evaluation. Results By gross observation, regeneration of the injured sciatic nerves was the best in group C and the poorest in group A. In aspects of growth of nerve fibers observed by microscopy and transmission electron microscopy, the transportation distance of retro-marked fluorescence red in the injured sciatic nerves observed by fluoroscopy, glial fiber acid protein and nerve growth factors tested by immunofluorescence assay, concentrations of myelin basic protein and neuro-filament protein in the injured nerves tested by enzyme linked immunoassay, as well as in the mean ankle function score, group C was the best, next was group B , and group A was the poorest. The differences be-tween groups had statistical significance (P < 0.05). Conclusion OECa transplantation can repair in-jured nerves and has better effects than SCs transplantation.
ABSTRACT
By detection and analysis of neuro-information from amputee in experiments, a research on the correlations of three main nerves (median nerve, radial nerve and ulnar nerve), on the patterns for discharging information, and on the mechanics about how neuro-information dominates movements was performed. These researches would contribute to the development of neuroprosthesis.
Subject(s)
Adult , Humans , Male , Amputation, Surgical , Amputees , Arm , Artificial Limbs , Median Nerve , Physiology , Microelectrodes , Movement , Physiology , Radial Nerve , Physiology , Ulnar Nerve , PhysiologyABSTRACT
Biomechanical test in vitro was performed to study the biomechanical characteristics of the femoral component in the non-stemmed anatomical total hip prosthesis (A-Fix) arthroplasty. It mimics two stages, the early stage with cementless and the later stage with cement fixation that imitates bone ingrowth. The results were compared with that of normal proximal femur by normalized coefficient analysis. Translation of femoral head after hip replacement is slightly more than normal. The strain of femoral neck after replacement is lower than that of normal. It changes flatly. The security coefficient in early stage is raised by 13% on the tensile side and by 27.6% on the compressive side of femoral neck; that in later stage is raised by 29.6% and by 22.1% separately. The maximal torsional angle of femoral head is minimal, it is 0.02 times that of normal in early stage and 0.01 times in later stage. It demonstrated that A-Fix arthroplasty has the characteristics of low stress and deformation, high intensity and rigidity, and anti-loosening, thus affording mechanical evidences for its clinical use.
Subject(s)
Adult , Humans , Male , Arthroplasty, Replacement, Hip , Methods , Biomechanical Phenomena , Cementation , Methods , Hip Prosthesis , Prosthesis Design , MethodsABSTRACT
Aim To evaluate the short-term biocompatibility of a newkind of prosthetic nucleus-Evergel, which is made from the modifiedpolyvinyl alcohol hydrogel. Methods According to China national standardGB/T16886 documents, the toxicity of Evergel prosthetic nucleus materialwas investigated by the cytotoxicity test, sensitization test, haemolysis test,Ames test, mice marrow micronucleus test and chromosome aberration test ofmammalian cell in vitro. Results This material had no cytoxicity, no sen-sitivity, no obvious haemolysis, and no mutagencity in Ames test, micemarrow micronucleus test and chromosome aberration test of mammalian cellin vitro. Conclusion The Evergel prosthetic nucleus has a good biocom-patibility and can be used clinically.
ABSTRACT
Objective To investigate the efficacy of Kurokawa s open door expansive laminoplasty for the treatment of cervical spinal stenotic myelopathy. Methods Sixty seven patients admitted to Zhongshan hospital with cervical spinal stenotic myelopathy undergone Kurokawa s procedure in the last 6 years were included in this study. All of the patients were followed up after operation. The follow up period ranged from 10 months to more than 6 years. The average age at operation was 55.2 years. Japanese Orthopedic Association (JOA)score were used to measure the severity of cervical spinal stenotic myelopathy and recovery rates. Results JOA scores increased from 7.1 to 12.5, 12.9 and 12.8 at the first, third, and fifth postoperative year respectively(P
ABSTRACT
Objective To evaluate the characteristics of intervertebral fusion using autologous tricortical iliac crest graft, Harms cage and Carbon cage in the goat cervical spine models. Methods Twenty-four goats underwent C3-4 discectomy and intervertebral fusion, the later was achieved each with 8 goats by the following methods: Group 1, autologous tricortical iliac crest bone graft; Group 2, Harms cage filled with autologous iliac crest graft; Group 3, Carbon cage filled with autologous iliac bone graft. Radiography was performed pre- and post- operatively and after 1, 2, 4, 8, and 12 weeks. At the same time points, disc space height (DSH), intervertebral angle (IVA), and lordosis angle (LA) were measured. After 12 weeks, the goats were killed and fused segments were harvested. All cervical fusion specimens underwent histomorphological studies. Results One week after operation, the DSH, IVA and LA of Carbon cage fused group were statistically greater than those of autologous iliac bone graft and Harms cage fused group (P
ABSTRACT
Objective To reconstruct the three-dimensional structure of human brachial plexus including its outer contour and delicate pathways of nerve fascicles inside, and to explore an useful and practical method for three-dimensional reconstruction of brachial plexus. Methods Taking woman hair as the localizing marks, two left-side brachial plexus from healthy adult cadaver were serially horizontally sliced with each section 0.2 mm in thickness(from the outlet of nerve root canal to the origin of median nerve, about 20 cm in length on an average), each slice was stained by AchE histochemical method. Each section of the two-dimensional image was taken by high-resolution digital camera, and the three-dimensional microstructure of brachial plexus was reconstructed and computer-assisted. Results The three-dimensional structure of brachial plexus reappeared successfully, including its outer contour and its delicate pathways of nerve bundles inside, the topographic anatomy of every nerve fascicle and its relationship in arbitrary sections as well as the patterns of branching, intersection and recombination of nerve bundles in the whole length. It could also display the outer contour of brachial plexus and the delicate pathways of nerve bundles inside either separately or totally. The reconstructed microstructure of the brachial plexus was smooth, natural and realistic, it could be rotated, zoomed and divided in any direction. The fascicular number of C7 root was more than C6 or C8, while C5 and T1 were the least. Conclusion The three-dimensional structure of brachial plexus inside is very complicated. The nerve bundles crisscross and recombine with each another. It combines a fine and delicate nerve network. Using the advanced localizing method, a good result is obtained. This is a practical method for three-dimensional reconstruction of the microstructure of brachial plexus.
ABSTRACT
Objective To evaluate the effects of the synthetic osteogenic growth peptide (sOGP) on the healing of tibial fractures in rabbits. Methods Fifty two tibial fracture models were produced in the tibiae of New Zealand white rabbits and immobilized with a 2 mm diameter Kirschner wire as intramedullary nail and grouped by random. sOGP was administered to experimental animals by intravenous injection (0.5 ?g?kg-1 ?d-1) from the first day after surgery until the day before sacrifice, while the control animals were injected with saline solution. 3-5 rabbits from each group were killed at 1, 2, 3, 4, 6 weeks after fracture. The serum was obtained to determine the level of ALP and BGP by biochemistry and RIA respectively. The bone mineral density at fracture healing site was detected by DXA, the anteroposterior and lateral radiographs were taken, the histological examination was done and quantitative analysis of the callus area and the relative amounts of bone, cartilage, and fibrous tissue in the callus of each section were calculated by computer program. The 6 weeks tibial sample were tested biomechanically by universal material test machine. Results The serum ALP, BGP level were higher in sOGP injected groups than those in the controls. All tibia osteotomies healed uneventfully on radiograph. The area of the external callus was larger in the experimental groups than that in controls at 3,4 weeks after fracture; the average area was 265.44 mm2 at 3 weeks, 233.10 mm2 at 4 weeks in the experimental groups compared with that of 209.95 mm2 at 3 weeks and 209.21 mm2 at 4 weeks in the controls. The average bone mineral density at fracture healing site was slightly greater in the experimental group at 3,4,6 weeks, and the difference of the bone mineral density at 4 weeks has statistical significance (P
ABSTRACT
PurposePresent study investigated the role of metal on metal surface replacement of the hip in treating the young patients suffering rheumatoid arthritis or aseptic necrosis of femoral head.Methods Between Jan. 1995 and Dec. 1996.16 patients with 17 hips( rheumatoid arthritis 14, aseptic necrosis of femoral head 3) were resurfaced with hybrid metal on metal surface replacement prothesis. Patients were evaluated by self assessment form,hip function examination. Radiographs and Harris hip score. The average follow up time was 58.2 months. ResultsNo patient received revision. Radiographs showed that all implants were in position satisfyingly. No loosening were revealed. The result of self assessment showed that patients were satisfied with 16 hips. The Harris score rose from preoperative 44(31 - 52) to postoperative 91 (79- 96). ConclusionsThe metal on metal surface replacement of hip is a useful treatment to release pain and keep the hip function of young patients suffering rheumatoid arthritis or aseptic necrosis of femoral head.
ABSTRACT
Objective To explore the Ilizarov reconstructive technique and its efficacy for the complicated bone defect in long bone. Methods From January 1996 to January 2005, totally 61 patients suffered with long bone defect were observed, which involved 46 males and 15 females with an average age of 28.2 years(range, 6-55 years). The bone defect occurred on the tibia in 29 patients, femur in 9, humerus in 11, radius in 7, ulna in 5. The treatment was tailored to the different length of defect: 30 patients with defect 4-6 cm were treated with the Ilizarov osteotomy and lengthening method; 21 patients with defect 6-9 cm were treated with the segmental transporting technique; 10 patients with defect beyond 9 cm were treated with pedicle fibular graft and Ilizarov fixation. The average bone lengthening was 4.8 cm with the duration of follow up from 10 to 84 months(with an average of 47 months). Results All the 61 cases averagely got bone union at 7.1th month and fixator removal at 8th month after operation, respectively. The low-grade infection and effusion occurred in 78 pin tracts on 21 patients, which were attributed to bone absorption around the pin and improper wound care. And still 1 patient with fibular transplantation got refracture due to trauma before the fixator removal. Conclusion The key point in the Ilizarov technique for the long bone defect nonunion is to excise the lesion thoroughly, and reconstitute it later. The Ilizarov technique is an effective method to treat the severe defect in long bone and restore the extremity length.