[Objective]To explore the effects of axial stress regulation on healing of lengthened callus.[Method]Tibiaes of 40 rabbits divided into 2 groups were lengthened with circular external fixator.X-ray bone density and histology tests were performed.[Result]The X-ray showed lengthened callus was different after operation.In the control group,lengthened center had a serial callus and cortex had not formed,in the experimental group lengthened center had serial cortex and ttransfixial medullary cavity expects serial callus.[Conclusion]Axial stress regulation and periodicity continue to shortened micromovement stress may promote healing after bone lengthening.

Objective:To investigate the prevalence of mild cognitive impairment (MCI) among elderly people aged 60 and over in urban and rural areas of Guizhou Province. Methods:A total of 4535 residents aged 60 and over was selected by random cluster sampling in Giuyang City and Zheng'an County. All participants were interviewed with questionnaires, they also received physical examination for related information, and their cognitive function was assessed by the mini-mental state examination (MMSE). Frisoni's criteria for MCI, the score of MMSE below one standard deviation matching age and education was used to this investigation. Chi-square test and u test were used in data analysis. Results: The total prevalence of MCI among all elderly people aged 60 years and over was 15.4%. Prevalence for urban community was higher than that of rural area (16.3% vs. 13.2%,?2=6.71, P=0.01). Prevalence in female (17.0%) was higher than in male (13.1%)(?2=12.88, P

Objective To observe the effects of negative pressure wound therapy (NPWT) on survival of the blade-thickness free skin grafts. Methods Sixty-five patients with skin defects were divided into NPWT treatment group ( Group Ⅰ,n =35) and conventional treatment group ( Group Ⅱ,n =30) according to different postoperative fixation methods.The patients in Group Ⅰ were fixed with the aid of NPWT after blade-thickness free skin grafting,and the patients in Group Ⅱ were fixed with tie-over bolster dressing. Results The survival rate of the skin grafts of Group Ⅰ was significantly higher than that of Group Ⅱ at day5 postoperatively [ (80.59 ±10.30)％ vs (71.46 ±10.68)％,P＜0.05].The survival period for the skin grafts of Group Ⅰ was shorter than that of Group Ⅱ[ (5.34 ± 0.87) days vs ( 11.20 ± 1.65) days,P ＜ 0.01].The duration of postoperative hospital stay of Group Ⅰ was obviously shorter than that of Group Ⅱ (P ＜ 0.01 ).The cost of antibiotics of Group Ⅰ was less than that of Group Ⅱ [ ( 1 765.71 ± 164.39) RMB yuan vs (2 700.00 ±221.28) RMB yuan,P ＜0.01].The dressing frequency and cost of group Ⅰ were less than those of group Ⅱ [(3.11 ± 0.32) times,(249.14 ±25.82) RMB yuan vs (4.53 ±0.68) times,(362.67 ±54.52) RMB yuan,P＜0.01]. Conclusions The application of NPWT to the postoperative period of skin grafting can promote the survival of the skin grafts,shorten the duration of hospitalization and reduce antibiotics use and dressing frequency.

BACKGROUND: Anterior cervical discectomy and fusion has been considered the gold standard for treatment of symptomatic degenerative disc disease within the cervical spine.However,fusion may result in progressive degeneration of the adjacent segments.Artificial disc replacement seems to be promising,segmental motion and stability are preserved while the spinal canal has been enlarged,and the intervertebral disc biological mechanics has been preserved,but not leads to progressive degeneration of the adjacent segments.OBJECTIVE: To observe the functional outcome and kinematics after the Prodisc artificial neck intervertebral disc replacement.METHODS: A total of 55 cases (69 intervertebral discs),29 males and 26 females,aged 48 (31-76) years were selected,including14 with bi-segmental injury.There were 32 cases of cervical spondylotic myelopathy,9 of cervical spondylotic radiculopathy,and 14 of mixed type cervical spondylosis.Prodisc artificial neck intervertebral disc replacement was performed using anterior or oblique incision.Prospective data JOA score and kinematic measures were collected before surgery and at 3,6,12,and 24 months after surgery.Range of motion was determined by independent radiologic assessment of flexion-extension radiographs.RESULTS AND CONCLUSION: The 55 patients were followed-up,including 41 undergoing single segmental disc replacement and 14 undergoing bi-segmental disc replacement.They were followed up for 22(56-48)months postoperatively.JOA scores displayed improved cervical function by 56%.Range of motion of sagittal and coronal planes were similar to those prior to operation compared with preoperatively(P = 0.45,0.74),and the range of motion and stability were maintained as adjacent segments.Results showed that the artificial disc replacement maintained range of motion of original intervertebral disc,accelerated patient recovery,and slightly affected adjacent intervertebral disc.

BACKGROUND:As a bone scaffold material,β-tricalcium phosphate has good biocompatibility, osteoinductive, and biomechanical properties.
OBJECTIVE:To study the effect of al ogeneic osteoblasts compounded withβ-tricalcium phosphate in repairing rabbit radial defects.
METHODS:A total of 45 rabbit radial defect models were made and divided into three groups in random. Experimental group was repaired with the compound of al ogeneic osteoblasts andβ-tricalcium phosphate;
control group withβ-tricalcium phosphate;and blank control group with nothing. The new bone formation of each group was observed and assessed by X-ray and histopathological analysis at weeks 4, 8, 16 after implantation for evaluation of the bone repairing effect.
RESULTS AND CONCLUSION:With the repair time, the experimental group appeared to complete bone defect repair gradual y. By the end of 16 weeks, the X-ray showed that the bone cal us between the scaffold and the host was completely ossified, and bone defects were completely repaired in the experimental group. Histopathological observation showed continuous cortical bone formed in the defect area, and canal recanalization realized in the experimental group. Additional y, the repair effect in the experimental group was better than that in the control and blank control group at different time points (P<0.01). It is suggested that the al ogenic osteoblasts/β-tricalcium phosphate compound has the better effects on guiding bone regeneration and preventing from nonunion.

Objective To investigate the biological effect of 50 Hz sinusoidal electromagnetic fields at 1 mT on the proliferation of the human osteosarcoma cell line MG-63.Methods Osteosarcrma MG-63 cells were divided into control and experimental groups.The control group was incubated without an electromagnetic field; the experimental group was incubated in a 50 Hz,1.0 mT sinusoidal electromagnetic field.On the 2nd,4th and 6th day,their proliferation was determined using a cell counting kit-8(CCK-8)assay.Variations in the cell cycle were detected with flow cytometry(FCM).Semi-quantitative reverse transcription-polymerase chain reaction(RT-PCR)was used to measure cyclin B1 and cyclin D1 mRNA.Results Compared with the control group,proliferation of the experimental group cells was reduced significantly.The percentage of cells at G0-G1 phase increased,and the mRNA expression of cyclin B1 and cyclin D1 was significantly reduced.Conclusions A 50 Hz sinusoidal electromagnetic field at 1.0 mT can inhibit the proliferation of osteosarcoma cell line MG-63 significantly.

Objective To investigate the effect of recurrent patella dislocation by grafting dual-bundle semitendinosus to anatomically reconstruct of medial patellofemoral ligament(MPFL)under arthroscopy.Methods From January 2006 to January 2010,29 cases(31 knees)with recurrent dislocation of the patella were performed arthroscopic surgery,including 11 males and 18 females(20 knees)with an average age of 22 years(range,16-32).The key point of surgery was reconstruction MPFL with dual-bundle free autogenous semitendinosus by using two anchors and bone groove to fixed on the patella,and using the interference screw to fixed on the femur.Adjusting the patella reset under arthroscopy.Tibial tubercle were transferred to inside in 5 cases.All patients were followed up for an average of 14 months(ranging 9-22).The imaging evaluation included congruence angle,lateral patellofemoral angle and lateral shift.The clinical therapeutic effect was evaluated with International Knee Documentation Committee(IKDC),Lysholm and Tegner scores.Results The fear test was negative after operation.There was no redislocation and fracture of the patella during follow-up.The congruence angle,lateral patellofemoral angle and lateral shift were 5.65°±2.23°,3.52°±2.63° and 0.25±0.46 respectively at the final follow-up.The mean IKDC,Lysholm and Tegner scores were 93.20±5.33,93.02±6.08 and 6.58±0.87 respectively at the final follow-up.All were showed statistically significant differences compared with preoperation(P＜0.05).Conclusion It is demonstrated that there was a reliable short-term effect to treat recurrent patella dislocation by grafting dual-bundle semitendinosus to anatomically reconstruct of MPFL under arthroscopy.

Objective The images of CT Equipment without DICOM interface are stored by means of film all along,and they can't be digitally stored,shared,retrieved,integrated to diagnostic reports.This paper introduces a method to capture images,mainly focus on the image capture and crop technology.Methods The hardware is composed of Philip Tomoscan AV CT,PC,OK_RGB20B image capture card,foot switch.The software is programmed by Microsoft Visual C++6.0,OK_RGB20B SDK and GDI+ Class Library on Windows 2000 operating system.Results The system can capture the CT image successfully,and make the images stored and shared permanently.Conclusion This method is a valuable clew for capturing images from other types of non-DICOM-based medical equipment such as ECT,X-ray,Ultrasound,Endoscope and so on.

Objective To find a programming method of magnifying two-dimentional medical image for clearer view and more precise diagnosis. Methods The software was programmed by using Microsoft Visual C++6.0 and GDI+ Class Library on Windows 2000 operating system. Results The software could magnify the medical images with high quality and definition. Conclusion This method is valuable for medical image digital post-processing.

Objective To realize foot switch long-distance control of PC for medical image acquisition. Methods The foot switch was connected with PC through RS232 DB9 port, and the software was programmed by Microsoft Visual C++6.0 on Windows 2000 operating system. Results Foot switch control of PC was successfully achieved in acquiring medical images. Conclusion The foot switch has the advantages of long-distance and foot control of PC. It not only saves manpower but ensures the accuracy and real time of images acquired. This method can be applied to image acquisition workstations for medical equipments such as CT apparatus, X-ray apparatus, Ultrasound apparatus, Endoscope apparatus and so on.