ABSTRACT
Objective To investigate the possible protective effect of adenoviral vector expressing interleukin-1β (IL-1β) small hairpin RNA (shRNA) on spinal cord injury (SCI) and its mechanism in rats.Methods Forty-eight adult male Sprague-Dawley rats were randomly assigned to 4 groups including the Sham, the Vehicle,the Ad-GFP and the Ad-shIL-1β groups.SCI was induced by epidural compression.Motor function of hind limbs was evaluated by Basso-Beattie-Bresnahan (BBB) score, the expressions of green fluorescence in injured spinal cord tissue were observed by fluorescence microscope.Enzyme-linked immunosorbent assay (ELISA) and immunofluorescence were also performed.Results The expressions of green fluorescence in injured spinal cord tissue were observed in the Ad-GFP and Ad-shIL-1β groups one day after SCI.Significant functional improvement was observed in the Ad-shIL-1β group (8.17 ± 1.17, 10.17 ± 0.98 and 11.33 ± 0.82, respectively) compared to the Vehicle (4.00 ± 0.89, 5.67 ± 1.03 and 6.17 ± 1.17, respectively) and Ad-GFP (3.83 ± 0.98, 5.33 ± 1.21 and 5.67 ± 1.03, respectively) groups at 7, 14 and 21 days after SCI (P ＜ 0.05).Rats in the Ad-shIL-1β group had less neuronal loss 21 days after SCI.In addition, IL-1β downregulation significantly decreased IL-1β, tumor necrosis factor-or (TNF-α) and IL-6 levels (138.83 ± 7.96,143.38 ± 10.20 and 120.43 ± 9.79 in Ad-shIL-1β group;169.33 ± 11.45, 172.33 ± 8.26 and 163.00 ± 9.57 in Vehicle group;172.83 ± 10.85,167.48 ± 8.19 and 159.48 ± 10.98 in Ad-GFP group, respectively) one day after SCI (P ＜ 0.05).Conclusion This study demonstrated that the IL-1β downregulation may have potential therapeutic benefits for improving the outcomes after SCI.
ABSTRACT
AIM:To analyze the cause of hip prosthesis dislocation,so as to prevent the dislocation following total hip arthroplasty(THA).METHODS:Between January 2002 and June 2007,a total of 348 cases(406 hips) received THA in the Department of Orthopaedics,the Second Affiliated Hospital of Fujian Medical University,and 15 patients(15 hips) occurred dislocation(3.7%),including 6 males and 9 females.Their age ranged 35-76 years,with a mean of 58 years.Primary affections consisted of femoral neck fracture in 3 cases(one with dislocation rebuilding after THA),femoral necrosis in 5 cases,hip arthodysplasia in 5 cases,and osteoarthritis in 2 cases.THA was carried out through lateral approach in 8 patients,and posterior lateral approach in 7 patients.The first dislocation occurred in 2 patients within 2 weeks,3 patients during 2-4 weeks,6 patients during 4-6 weeks,3 patients during 6-12 weeks,and 1 patient 12 weeks later.The movement of dislocation occurrence includes moving the patients in 2,turning over in 2,turning around in 4,trying to stand from sitting in 3,sock wearing in 3,and picking up in 2.It was revealed in the clinical analysis and operational incision that anterior dislocation was found in 6 cases,while posterior dislocation in 9 cases;proper placement of prosthesis in 5 cases,while incorrect placement in 10 cases.Close reduction was conducted in short time after dislocation,achieving success in 11 cases.There were 4 cases treated with open reduction after failure of close reduction,and hip joints were restricted.Seven patients were found dislocation again.And four patients prolonged external fixation and 3 patients were performed revision.RESULTS:The follow-up period ranged from 10 to 60 months.Eight cases succeeded the first reduction,with good joint stability and without relapse.Redislocation occurred in 4 cases,and was cured by prolonging fixation.No cases following revision were found dislocation.The average score was(85?5) according to Harris scoring system.There was no biocompatibility between the materials and the host.CONCLUSION:We should emphasize prevention of dislocation in the early THA and enough fixation time after reduction.