Objective To analyze the features of muscle ischemic injury in patients with crush syndrome due to be trapped under the rubble for a super long time in the Wenchuan earthquake.Methods Eight patients were identified with crush syndrome from 1070 hospitalized patients after Wenchuan earth quake in May 12,2008,including 4 males and 4 females,with the mean age of 35.4 years(range,25-45 years).The trapping time ranged from 9 to 152 hours,with an average of 52 hours.Six cages(eight limbs) were amputated due to acute renal failure caused by crush syndrome.Eight patients were treated with continuous renal replacement treatment(CRRT).Two cases died of cerebral hemorrhage and intestinal perforation.One was diagnosed gas gangrene.The mechanisms of the crush syndrome were also analyzed.The musculature necrosis differed after trap condition and time were notified and noted.Results The characteristics of muscla crush injury were described below.1)The ultra long trapping time leading to acute renal failure.2)The patients with crush injury might be easily ignored due to the mild skin damaged.3)Deep muscles revealed more severe injury than the superficial muscles.4)The muscle necrosis took place in multiple compartments and areas.5)It Was ditiicult to identify and resect the muscles of early necrosis mixed with the normal musculature.6)A secondary hemorrhage might occur after necrotic tissues falling from the wounds.Conclusion According to the features of the muscle crush injury in the Wenchuan earthquake,the crushed limbs should be operated for extended decompression and debridment after indicated swellings.The more subterranean necrosis might cause infection even weeks after the injury signaled by that the patient had an unexplainable fever.The decompressed area should be left open.MR examination Was helpful to identify early muscle necrosis.If a crush syndrome is suspected the CRRT application wag beneficial in life save and limb salvage except for the decompression surgery.

20 cases of cavus deformity of foot were corrected by tarsal wedge osteotomy. The procedure was adopted because this type of deformity had its peculiar anatomical features. 18 feet were followed up postoperatively. and the result was found to be satisfactory 7 months to 5 years alter the operation. The following 2 problems were particularly discussed:1.Cavus defomity is characterized by a marked increase in the longitudinal arch and flexion of the forefoot, with the dome of the arch situating just under naviculo-cuneiform joint. It is therefore deemed most reasonable to perform osteotomy at this point. We think that this procedure gives better result than that recommended by McElvenny and Caldwell or v-osteotomy designed by Japas.2.In cavus foot the result of the operation depends a great deal on an accurate measuremnt of the deformity on the x-ray film. It was suggested that the deformity may be classified as mild, moderate and severe types basing on the measurement of the lateral x-ray film of the affected feet.

Periosteal autograft from different sources have been used to repair 1.5cm bone defects of radius in 10 rabbits.On the left side,sharp-dissected grafts were implanted and the animals were sacrificed 4,8,14,30 and 60 days after operation.Bone formation was studied with X-ray and histologic technique.The results showed that the way of sharp-dissecting can preserve the periosteum completely,and good bone formation was found in this group.It suggested that the sharp-dissecting of the periosteum is the important key for periosteal graft.

Objective To investigate the effects of transforming growth factor-?1(TGF-?1), fibroblast growth factor-2 (FGF-2), platelet derived growth factor-bb(PDGF-bb) and hepatocyte growth factor(HGF) on adult human articular chondrocytes(AHAC) proliferation and phenotype maintaining. Methods Isolated AHAC were cultured in DMEM/F-12 supplemented with 10% human AB serum, 50 ?g/ml ascorbic acid-2-phosphate, 0.4 mmol/L proline, 5 ?g/ml insulin and 1 mmol/L non-essential amino acids (NEAA). The cells of 2nd passage were used for proliferation kinetics studying: 2.0?103 cells/well were seeded on 96-well plate, 24 h later, the cells were stimulated with various growth factors or combinations of these growth factors respectively, and the proliferation kinetics were analyzed by MTT colorimetric method. The passaged chondrocytes' phenotype were assessed by safranine O staining and immunostaining for type Ⅰ,Ⅱcollagens and aggrecan. Results All four growth factors: FGF-2, TGF-?1, PDGF-bb and HGF, could promote the proliferation of AHAC, and the optimal concentrations,when used separately, were 50 ng/ml, 1 ng/ml, 1 ng/ml, 20 ng/ml respectively. While 5 ng/ml FGF-2 combined with 1 ng/ml TGF-?1 could achieve the best proliferation effect, additionally adding PDGF-bb, HGF or both could not enhance more. With the combination of FGF-2 and TGF-?1, the AHAC could expand over 2000-fold and passage over 10 times. Chondrocytes of 9th passage still excreted type Ⅱcollagen and glycosaminoglycan(GAG). Conclusion 5 ng/ml FGF-2 combined with 1 ng/ml TGF-?1 is a very appropriated circumstance for in vitro expanding of AHAC.

Objective The purpose of this study is to observe the property of guided bone regeneration by collagen membrane and investigate the mechanism of guided bone regeneration. Methods 10mm defect of radius was created bilaterally in adult New Zealand rabbits. The experimental group was transplanted by collagen membrane with surface decalcified bone allograft,and the control group was transplanted by surfaced decalcified bone allograft alone.Radiological and histological and immunohistochemical examinations were taken postoperatively. Results In the transplantation area of experimental group,distinctive periosteal reaction and new bone growth occurred remarkably,bone remodeling progressed successfully,and defects healed completely.But in the transplantation area of the control group,new bone growth and mature bone replacement were delay due to occupation of fibrous connective tissue. Conclusions Collagen membrance has an ability to block and guide.In addition,membrane tube can keep endogenic BMP with exogenic BMP greatly concentrating and effectively distributing. The distributive characteristic of BMP exerts an influence on cellular resources and pattern of bone healing.

Objective To investigate the bionomics of mesenchymal stem cells (MSCs) derived from Wharton's jelly of human umbilical cord. Methods Umbilical arteries, vein and umbilical cord tunica externa were removed, and the remaining tissue (Wharton's jelly) was harvested. To gather MSCs, the umbilical cord was cut into small fragments and digested with 0.075% type Ⅰ collagenase, or the small fragments were cultured with DMEM. The cells derived from Wharton's jelly of umbilical cord were serially subcultivated, the growth curve was drawn, and the identification of living cells was made for studying the cell growth kinetics. The surface antigens were detected with flow cytometry, the cartilage markers were detected by histochemistry and immunohistochemistry, and the expressions of Sox-9 and Col-2A1 mRNA were analyzed by RT-PCR. Results The confluence time of primary culture cells was 3-5d in cells harvested with enzyme digestion, and 10-15d in cells harvested with micro mass. The results of flow cytometry showed that the MSCs derived from umbilical cord expressed CD44 and CD105; the expression of HLA-ABC was positive, while HLA-DPDQDR was negative. There was no significant change on the immunophenotype of umbilical cord MSCs after cryopreservation and thawing. The findings of histochemistry and immunohistochemistry showed that the expression of chondrocyte markers in Wharton's jelly MSCs was weakly positive. The results of RT-PCR showed the chondrocyte markers Sox-9 and Col-2A1 were positively expressed in Wharton's jelly MSCs. Conclusion The MSCs derived from Wharton jelly of human umbilical cord do not differentiate into hematopoietic cells, may express the chondrocyte markers (they are suggested to have characteristics of pre-chondrocytes), and is expected to be a new type of stem cells of tissue engineering cartilage.

0.05).There were better effect of removal of myelin(P2

Objective To develop a method to prepare human articular cartilage derived microcarrier for both rapid propagating chondrocytes and being used as scaffold to support chondrogenesis. Methods Human articular cartilage was crushed into small pieces by muller after lyophilization, and sorted through two different meshes to collect only those specimens measuring 150-200 microns. Then, in turn, the specimens were subjected to 0.25% trypsin at 37 ℃ for 24 hours and 1% Triton X-100 for 72 hours, respectively. The specimens were observed by inverted phase contrast microscopy, and assessed by staining with haematoxylin-eosin, safranin-O (for GAG), as well as by the immunohistochemistry of aggrecan, collagen type Ⅱ. The microcarriers were seeded with human chondrocytes after being irradiated by 60Co. Results Using inverted phasecontrast microscope, the freezing-dry cartilage particles were observed as yellow, different shapes, and their surfaces were uneven, and with many pits. After treating with trypsin and Triton X-100, the microcarriers showed light yellow, without cartilage morphology. The microcarriers became flocculous or like a hairbrush, and the area of contacting surface significant increased. After culture with cartilage cell for 2 hours, lots of spherical chondrocytes adhered to the microcarriers. HE stain of section confirmed that the celluar constituents of the specimens were removed, the specimens stained weakly positive for GAG, negatively for aggrecan, and positively for collagen type Ⅱ, respectively. Conclusion The detergent and trypsin can remove the cellular constituents and knock out the aggrecan from human articular cartilage while maintaining collagen type Ⅱ and GAG, and made the cartilage pieces flocculous or hairbrush-like. The chondrocytes can be well maintained in human articular cartilage derived microcarriers. Human articular cartilage derived microcarriers were prepared successfullly.

[Objective]To investigate the influence of Nitinol modified on its surfaces by the coating of titanium or titanium-niobium alloy on separat ion of Ni~(2+).[Method]The specimens from 1 to 7 days after the experiments were collected and the concentration of Ni~(2+) were cletermined by physiologic saline immersing test,low temperature ashing furnace,Mg(NO_3)_2 as matrix modifier and graphite furnace atomic absorption spectrometry(GFAAS).[Result]Specimens of Nitinol were devided into 3 groups:alloy coated with Ti(Ti group);alloy with Titanium-Niobium(TiNi group);only Nitanol without coating group.Obvious separation of Ni~(2+) was detected in the groups of Nitinol that were not modified and were put in baking oven(37℃),the separating procedure was mainly within 4 days,the separation rate(10~(-7)??g? cm~(-2)?s~(-1)) from the first to the forth days was 18.2,3.45,1.75 and 0.45 respectively,the Ni~(2+)was no more separated from the fifth day.Whereas,Ni~(2+) was not separated in the groups of Nitinol that were modified by the coating of metallic Ti and TiNb alloy.The recovery rate of the experiments was between 94.6%～108.6%.[Conclusion]The coating of Ti or TiNb on the surfaces of Nitinol stopped Nitinol from separating Ni~(2+).

[Objective]To analyze factors related with surviving rate and to evaluate effectiveness of the adjuvant chemotherapy in the treatment of osteosareoma.[Method]Eighty-four patients aging from 9 to 47 years(averaged,21 years)were analysed respectively:52 of them were male and 32 were female.The tumors were located at the femur in 42,the tibia in 29,the humerus in 13.There were 22 patients classified as stage ⅡA and 62 patients as ⅡB.The pathological study,of subtype of osteosarcoma revealed that 47 were osteoblastic,11 chondroblastic,19 fibroblastic and 7 other subtypes.There were 46 patients who received the chemotherapy;38 patients without chemotherapy,49 of the 84 patients treated surgically had limb salvage procedures,35 had amputations.Multivariate analsis was done by using the proportional hazards model of Cox,categoric data were analyzed by using the chi-square statistic.[Result]All cases were followed up from 6 to 74 months(with an average of 25.5 months).Cox model analysis showed that age,sex,site,and subtype were not significant prognostic variables in this group of patients;the significant affecting prognosis in patients was Enncking staging and chemotherapy.Chi-square showed significant difference in the higher metastasis rates of lung in the group without chemotherapy than in those with chemotherapy group(P