Structural basis for the tethered peptide activation of adhesion GPCRs.

Adhesion G-protein-coupled receptors (aGPCRs) are important for organogenesis, neurodevelopment, reproduction and other processes1-6. Many aGPCRs are activated by a conserved internal (tethered) agonist sequence known as the Stachel sequence7-12. Here, we report the cryogenic electron microscopy (cryo-EM) structures of two aGPCRs in complex with Gs: GPR133 and GPR114. The structures indicate that the Stachel sequences of both receptors assume an α-helical-bulge-ß-sheet structure and insert into a binding site formed by the transmembrane domain (TMD). A hydrophobic interaction motif (HIM) within the Stachel sequence mediates most of the intramolecular interactions with the TMD. Combined with the cryo-EM structures, biochemical characterization of the HIM motif provides insight into the cross-reactivity and selectivity of the Stachel sequences. Two interconnected mechanisms, the sensing of Stachel sequences by the conserved 'toggle switch' W6.53 and the constitution of a hydrogen-bond network formed by Q7.49/Y7.49 and the P6.47/V6.47φφG6.50 motif (φ indicates a hydrophobic residue), are important in Stachel sequence-mediated receptor activation and Gs coupling. Notably, this network stabilizes kink formation in TM helices 6 and 7 (TM6 and TM7, respectively). A common Gs-binding interface is observed between the two aGPCRs, and GPR114 has an extended TM7 that forms unique interactions with Gs. Our structures reveal the detailed mechanisms of aGPCR activation by Stachel sequences and their Gs coupling.

Guideline for diagnosis and treatment of spine trauma in the epidemic of COVID-19.

Outbreak of COVID-19 is ongoing all over the world. Spine trauma is one of the most common types of trauma and will probably be encountered during the fight against COVID-19 and resumption of work and production. Patients with unstable spine fractures or continuous deterioration of neurological function require emergency surgery. The COVID-19 epidemic has brought tremendous challenges to the diagnosis and treatment of such patients. To coordinate the diagnosis and treatment of infectious disease prevention and spine trauma so as to formulate a rigorous diagnosis and treatment plan and to reduce the disability and mortality of the disease, multidisciplinary collaboration is needed. This expert consensus is formulated in order to (1) prevent and control the epidemic, (2) diagnose and treat patients with spine trauma reasonably, and (3) reduce the risk of cross-infection between patients and medical personnel during the treatment.

Dysregulated MiR-3150a-3p Promotes Lumbar Intervertebral Disc Degeneration by Targeting Aggrecan.

BACKGROUND/AIMS: Low back pain has become one of the most common musculoskeletal diseases in the world. Studies have shown that intervertebral disc degeneration (IDD) is an important factor leading to low back pain, but the mechanisms underlying IDD remain largely unknown. Research over the past decade has suggested critical roles for microRNAs (miRNAs) in natural growth and disease progression. However, it remains poorly understood whether circular RNAs participate in IDD. METHODS: Clinical IDD samples were collected from 20 patients who underwent discectomy. Weighted gene co-expression network analysis was used to identify the co-expression miRNA network modules (highly co-expressed clusters of miRNAs) that were associated with IDD grade. RESULTS: miR-3150a-3p was the most significantly up-regulated miRNA in module "Blue." Notably, aggrecan (ACAN) was identified as a direct target gene of miR-3150a-3p and ACAN expression was regulated by miR-3150a-3p. Overexpression of miR-3150a-3p decreased ACAN expression in nucleus pulposus cells, whereas inhibition of miR-3150a-3p increased ACAN expression. In addition, ACAN expression was negatively correlated with IDD grade. CONCLUSION: Our study suggests that the reduction of ACAN expression induced by the upregulation of miR-3150a-3p might participate in the development of IDD.

Abnormal DNA Methylation in Thoracic Spinal Cord Tissue Following Transection Injury.

BACKGROUND Spinal cord injury (SCI) is a serious disease with high disability and mortality rates, with no effective therapeutic strategies available. In SCI, abnormal DNA methylation is considered to be associated with axonal regeneration and cell proliferation. However, the roles of key genes in potential molecular mechanisms of SCI are not clear. MATERIAL AND METHODS Subacute spinal cord injury models were established in Wistar rats. Histological observations and motor function assessments were performed separately. Whole-genome bisulfite sequencing (WGBS) was used to detect the methylation of genes. Gene ontology (GO) term enrichment and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis were performed using the DAVID database. Protein-protein interaction (PPI) networks were analyzed by Cytoscape software. RESULTS After SCI, many cavities, areas of necrotic tissue, and many inflammatory cells were observed, and motor function scores were low. After the whole-genome bisulfite sequencing, approximately 96 DMGs were screened, of which 50 were hypermethylated genes and 46 were hypomethylated genes. KEGG pathway analysis highlighted the Axon Guidance pathway, Endocytosis pathway, T cell receptor signaling pathway, and Hippo signaling pathway. Expression patterns of hypermethylated genes and hypomethylated genes detected by qRT-PCR were the opposite of WGBS data, and the difference was significant. CONCLUSIONS Abnormal methylated genes and key signaling pathways involved in spinal cord injury were identified through histological observation, behavioral assessment, and bioinformatics analysis. This research can serve as a source of additional information to expand understanding of spinal cord-induced epigenetic changes.

Gene expression analysis at multiple time-points identifies key genes for nerve regeneration.

INTRODUCTION: The purpose of this study was to provide a comprehensive understanding of gene expression during Wallerian degeneration and axon regeneration after peripheral nerve injury. METHODS: A microarray was used to detect gene expression in the distal nerve 0, 3, 7, and 14 days after sciatic nerve crush. Bioinformatic analysis was used to predict function of the differentially expressed mRNAs. Microarray results and the key pathways were validated by quantitative real-time polymerase chain reaction (qRT-PCR). RESULTS: Differentially expressed mRNAs at different time-points (3, 7, and 14 days) after injury were identified and compared with a control group (0 day). Nine general trends of changes in gene expression were identified. Key signal pathways and 9 biological processes closely associated with nerve regeneration were identified and verified. CONCLUSIONS: Differentially expressed genes and biological processes and pathways associated with axonal regeneration may elucidate the molecular-biological mechanisms underlying peripheral nerve regeneration. Muscle Nerve 55: 373-383, 2017.

The Impact of Diabetes Mellitus on Patients Undergoing Cervical Spondylotic Myelopathy: A Meta-Analysis.

AIMS: We conducted a meta-analysis of eligible studies to compare the surgical outcomes between diabetic patients and non-diabetic patients who have undergone cervical spondylotic myelopathy (CSM). METHODS: A systematic literature search of PubMed, Embase, and Web of Science (up to February 10, 2016) was conducted. Eligible studies were case-control or cohort studies that compared the outcomes of cervical surgery between diabetic patients and non-diabetic patients. Weighted mean differences, risk ratios, and 95% CIs were calculated and heterogeneity was assessed with Cochrane Q chi-square test and I2 statistic. RESULTS: Six studies with a total of 38,680 patients were included in this meta-analysis. Pooled estimates showed that diabetic patients had significantly lower Japanese Orthopaedic Association (JOA) score change between pre- and post operation, and recovery rate than patients without diabetes. Moreover, diabetic patients had significantly increased risk of operative wound, epidural/wound hematoma, chronic lung disease, and cardiac complication. Other postoperative complications, including cerebrospinal fluid leakage and C5 radiculopathy, were not significantly different between the 2 groups. CONCLUSION: Diabetes mellitus decreased the JOA score change and recovery rate, as well as increased the risk of postoperative complications in patients undergoing CSM. Controlling diabetes mellitus before cervical spine surgery may lead to better outcomes.

Anterior inferior plating versus superior plating for clavicle fracture: a meta-analysis.

BACKGROUND: The position of plate fixation for clavicle fracture remains controversial. Our objective was to perform a comprehensive review of the literature and quantify the surgical parameters and clinical indexes between the anterior inferior plating and superior plating for clavicle fracture. METHODS: PubMed, EMBASE, and the Cochrane Library were searched for randomized and non-randomized studies that compared the anterior inferior plating with the superior plating for clavicle fracture. The relative risk or standardized mean difference with 95% confidence interval was calculated using either a fixed- or random-effects model. RESULTS: Four randomized controlled trials and eight observational studies were identified to compare the surgical parameters and clinical indexes. For the surgical parameters, the anterior inferior plating group was better than the superior plating group in operation time and blood loss (P < 0.05). Furthermore, in terms of clinical indexes, the anterior inferior plating was superior to the superior plating in reducing the union time, and the two kinds of plate fixation methods were comparable in constant score, and the rate of infection, nonunion, and complications (P > 0.05). CONCLUSIONS: Based on the current evidence, the anterior inferior plating may reduce the blood loss, the operation and union time, but no differences were observed in constant score, and the rate of infection, nonunion, and complications between the two groups. Given that some of the studies have low quality, more randomized controlled trails with high quality should be conduct to further verify the findings.

17ß-estradiol protects against apoptosis induced by interleukin-1ß in rat nucleus pulposus cells by down-regulating MMP-3 and MMP-13.

In our previous study, 17ß-estradiol was proved to protect rat annulus fibrosus cells against apoptosis induced by interleukin-1ß (IL-1ß). However, whether 17ß-estradiol has protective effect on rat nucleus pulposus cells remains unclear. The purpose of this study was to further explore the effects of 17ß-estradiol on rat nucleus pulposus cells based on IL-1ß-induced apoptosis. TUNEL assay and Annexin V/PI double staining were used to detect apoptosis and revealed that IL-1ß induced notable apoptosis, which was reversed by 17ß-estradiol. Meanwhile, cell viability and binding ability were decreased by IL-1ß, but activated caspase-3 was increased. However, all of the detected effects of IL-1ß were eliminated by 17ß-estradiol. Furthermore, real-time quantitative RT-PCR was used to further find that IL-1ß downregulated expression level of type II collagen, aggrecan, tissue inhibitor of matrix metalloproteinase (TIMP)-1, while upregulated matrix metalloproteinase (MMP)-3, MMP-13 and Bcl-2, which was further confirmed by western blot. Finally, 17ß-estradiol was proved to abolish the above negative effects of IL-1ß. In summary, this work presented that IL-1ß maybe induced apoptosis of rat nucleus pulposus cells, which was resisted by 17ß-estradiol by down-regulating MMP-3 and MMP-13 via a mitochondrial pathway. This research provides a novel insight into the anti-apoptotic effect of 17ß-estradiol on IL-1ß-induced cytotoxicity, and may potentially lead to a better understanding of the clinical effects of 17ß-estradiol, especially in terms of intervertebral disc degeneration.

Patellar tendon autograft versus patellar tendon allograft in anterior cruciate ligament reconstruction: a systematic review and meta-analysis.

OBJECTIVE: This review aims to compare the clinical results of bone-patellar tendon-bone (BPTB) autograft and BPTB allograft in primary anterior cruciate ligament (ACL) reconstruction. METHODS: PubMed Medline, EMBASE, and the Cochrane Library were systematically searched for prospective or retrospective cohort studies that compared BPTB autograft with BPTB allograft in ACL reconstruction. The results of the eligible studies were independently extracted and analyzed according to the following: one-leg test, range of motion (ROM), overall International Knee Documentation Committee (IKDC), Lachman test, pivot shift test, Lysholm scores, Tegner scores, KT-1000 test, anterior knee pain, crepitus, and clinical failure. Random-effect and fixed-effect models were adopted to calculate the weight mean difference and the odds ratio for continuous and dichotomous variables with 95% confidence interval. RESULTS: Thirteen studies met the inclusion criteria, resulting in 1,046 (484 autografts and 562 allografts) patients available for the present study. A meta-analysis showed no significant differences between the two treatment groups in terms of the following: one-leg test (p = 0.21), ROM (p = 0.41), overall IKDC (p = 0.25), Lysholm scores (p = 0.25), Tegner scores (p = 0.09), KT-1000 (p = 0.69), Lachman test (p = 0.89), positive pivot shift test (p = 0.18), anterior knee pain (p = 0.93), and crepitus (p = 0.96). However, a significant difference in clinical failure (p = 0.01) in favor of autograft was observed. In the fresh-frozen subgroup, no difference in the evaluations, except for Tegner scores, were found between autograft and allograft. CONCLUSIONS: Therefore, BPTB autograft shows potential as an optimal choice for ACL reconstruction on the basis of earlier functional recovery and fewer graft failure.

Comparison operative and conservative management for primary patellar dislocation: an up-to-date meta-analysis.

PURPOSE: The aim of this review was to compare the clinical outcomes between operative and conservative management for primary patella dislocation (PPD). METHODS: PubMed Medline, EMBASE, Google scholar, and the Cochrane Library were systematically searched for randomized controlled trials that compared operative technique versus conservative technique for PPD. The results of eligible studies were independently extracted and analyzed according to the following: patient's satisfaction, Kujala score, Tegner score, and redislocation rate. Random-effect and fixed-effect models were adopted to calculate the weight mean difference and the odds ratio for continuous and dichotomous variables with 95 % confidence interval. RESULTS: Seven studies met the inclusion criteria, resulting in 402 (216 surgery and 186 conservation) patients available for the present study. A meta-analysis showed no significant differences between the two treatment groups in terms of patient's satisfaction and Kujala score. However, significant differences in Tegner score (P < 0.00001) and redislocation rate (P = 0.002) were observed in favor of surgical treatment. In the subgroup analysis, surgical intervention achieved higher (P = 0.002) Kujala score in short term (<5 years), while conservation gained advantage (P = 0.003) in long term (>5 years). There was no significant difference in dislocation rate in long term. CONCLUSIONS: Surgical treatment might provide better clinical results in short term. More persuasive evidence is still needed to proof the effect of surgical management in long time.

Overexpression of suppressors of cytokine signaling 1 promotes the neuronal differentiation of C17.2 neural stem cells.

OBJECTIVE: To investigate the role and mechanism of suppressor of cytokine signaling 1 (SOCS1) in the regulation and differentiation of C17.2 neural stem cells (NSCs). METHODS: In this study, lentiviral (LV)-SOCS1-enhanced green fluorescent protein (EGFP) was constructed and transfected into C17.2 NSCs. There were three groups of C17.2 NSCs: LV-SOCS1-EGFP, LV-EGFP, and phosphate-buffered saline (PBS). The expression levels of microtubule-associated protein 2 (MAP2), glial fibrillary acidic protein (GFAP), myelin basic protein (MBP), nestin, and ß-tubulin III in C17.2 NSCs were analyzed by reverse transcription-polymerase chain reaction (RT-PCR), immunocytochemistry, and western blot. In addition, the phosphorylation level of Jaks/Stats family members in C17.2 NSCs were analyzed by western blot. Moreover, the morphological changes of C17.2 NSCs after transfection were observed by light microscopy. RESULTS: The gene expression of MAP2 increased significantly and the gene expression of nestin decreased significantly in C17.2 NSCs transfected with LV-SOCS1-EGFP. Some C17.2 NSCs underwent prominent neuronal morphological changes and expressed ß-tubulin III after LV-SOCS1-EGFP transfection. The number of positive cells for ß-tubulin III immunocytochemical staining and ß-tubulin III protein expression in C17.2 NSCs after LV-SOCS1-EGFP transfection were both more than those after LV-EGFP transfection or PBS treatment. The phosphorylation levels of Jak2 and Stat3 but not Jak3 in C17.2 NSCs were inhibited by SOCS1 overexpression. CONCLUSION: Overexpression of SOCS1 in C17.2 NSCs promotes the generation of neurons, which is likely mediated by the negative feedback inhibition of Jak2 and Stat3. This study is the first to provide evidence that SOCS1 is involved in the regulation of neurogenesis.

No difference in clinical outcome between fixed- and mobile-bearing TKA: a meta-analysis.

PURPOSE: To compare the clinical and radiographic results of fixed-bearing and mobile-bearing total knee arthroplasty (TKA). METHODS: We searched the PubMed, Medline, Embase, Cochrane Central Register of Controlled Trials, and Google Scholar databases from 1966 to January 2012. No language restriction was applied. Reference lists of all the selected articles were hand-searched for any additional trials. Trial quality was assessed using the modified Jadad scale. Two authors independently extracted data from all eligible studies, including study design, participants, interventions, and outcomes (Knee Society Score, range of movement, radiolucent line, patient preference, walking support, pain score, and complications). The data were using fixed-effects or random-effects models with mean differences and risk ratios for continuous and dichotomous variables, respectively. RESULTS: A total of 24 studies involving 2,799 patients were identified in this analysis. Meta-analysis showed lower pain score (OR, 0.66, 95% CI 0.46, 0.94) in mobile-bearing TKA than fixed-bearing TKA. There was no significant difference between the two treatment groups regarding Knee Society Score (SMD, -0.17, 95% CI: -0.60, 0.26), range of movement (SMD, -0.05, 95% CI: -0.63, 0.53), radiolucent line (OR, 1.03, 95% CI 0.74, 1.44), patient preference (OR, 1.15, 95% CI 0.82, 1.61), walking support (OR, 1.07, 95% CI 0.68, 1.70), and complications (OR, 0.85, 95% CI 0.59, 1.21). CONCLUSIONS: The available evidence suggested that there was no significant difference between clinical and radiographic results of fixed-bearing and mobile-bearing TKA except for pain score. Regarding clinical relevance, the less incidence of pain could be the advantage for selecting mobile-bearing TKA. LEVEL OF EVIDENCE: II.

Evidence-based computer-navigated total hip arthroplasty: an updated analysis of randomized controlled trials.

BACKGROUND: Total hip arthroplasty (THA) has evolved over the years to be a reliable, reproducible, and successful orthopedic procedure. Nowadays, THA is increasingly performed on patients using less invasive, tissue-preserving techniques. Accordingly, the use of computer navigation in total joint arthroplasty has become more prevalent. However, there is still lack of high-quality evidence to verify the most effective technique for THA. METHODS: A search was conducted in PubMed, Medline, Embase, Cochrane Central Register of Controlled Trials, and Google Scholar databases. Clinical trials published from 1966 to Feb 2012 that assess conventional techniques THA or computer-navigated techniques THA for placing the acetabular component. The main outcome measures included abduction angles, anteversion angles, percentage of acetabular outliers, operation time, decrease in Hb/24 h, and wound secretion/48 h. RESULTS: The pooled analysis across all studies showed a significant difference in anteversion angles and acetabular outliers (difference -0.22, 95% CI -0.67, 0.24; p = 0.346, I (2) = 71.9%) and (difference 8.34, 95% CI 4.15, 16.74; p = 0.000, I (2) = 0.0%). However, no significant difference in abduction angle and decrease in Hb/24 h (difference -0.22, 95% CI -0.67, 0.24; p = 0.346, I (2) = 71.9%) and (difference 0.03, 95% CI -0.36, 0.41; p = 0.888, I (2) = 0.0%). For the operation time, computer-navigated THA was longer (difference -0.73, 95% CI -1.32, -0.15; p = 0.014, I (2) = 74.4%). CONCLUSIONS: This meta-analysis demonstrated computer-navigated THA was a more favorable method for placing the acetabular component and decreased the number of acetabular cups implanted outside the desired range of alignment. More high-quality RCTs were needed to support the evidence.

Forked osteotomy arthroplasty for elbow tuberculosis: six years of follow-up.

BACKGROUND: Elbow tuberculosis (TB) is not rare in China. Most patients are diagnosed when it is at an advanced stage and with bony ankylosis complications. For a developing country, such as China, it is important for there to be safe and cost-effective procedures. MATERIALS AND METHODS: A retrospective study was designed to assess the effects of improved forked excision arthroplasty for treating elbow TB. There were 20 patients (average age, 48.45 years). For all patients, the preoperative diagnosis was elbow TB at an advanced stage. All patients underwent forked excision arthroplasty. Patients were evaluated preoperatively and postoperatively with the Mayo's elbow performance score (MEPS). Mean follow-up was at 74.4 months. RESULTS: At the last follow-up, the mean postoperative MEPS was 83.7 compared with the preoperative MEPS of 20.25. Results of Mayo's elbow performance index were excellent in seven patients, good in 12 and fair in one, and none were poor. The range of elbow motion also improved significantly. CONCLUSION: This study of forked elbow excision arthroplasty has shown promising results for treating elbow TB. Most patients had ideal postoperative outcomes and exhibited painless elbow joints, with satisfactory functional recovery at medium-term follow-up. Further studies with longer follow-up are warranted. LEVEL OF EVIDENCE: III.

Cemented versus uncemented hemiarthroplasty for displaced femoral neck fractures: an updated meta-analysis.

OBJECTIVES: To compare the outcomes of cemented and uncemented hemiarthroplasty for treating displaced femoral neck fractures. METHOD: We searched the PubMed, Medline, Embase, Cochrane Central Register of Controlled Trials, and Google Scholar databases from 1966 to Mar 2012. No language restriction was applied. Reference lists of all the selected articles were hand-searched for any additional trials. Trial quality was assessed using the modified Jadad Scale. Two authors independently extracted data from all eligible studies, including study design, participants, interventions, and outcomes (mortality, hospital stay, blood loss, operation time, residual pain, and complications). The data were using fixed-effects and random-effects models with mean differences and risk ratios for continuous and dichotomous variables, respectively. RESULTS: A total of 12 studies involving 1805 patients were identified in this analysis. Meta-analysis showed longer operation time (SMD, -0.43, 95 % CI -0.56, -0.30) in cemented versus uncemented hemiarthroplasty. There was no significant difference between the two treatment groups regarding mortality (OR, 1.08, 95 % CI 0.88, 1.34), hospital stay (SMD, -1.21, 95 % CI -2.24, -0.18), blood loss (SMD, -0.12, 95 % CI -0.33, 0.10), operation time (SMD, -0.43, 95 % CI -0.56, -0.30), residual pain (OR, 1.42, 95 % CI 0.99, 2.03), and complications (OR, 0.82, 95 % CI 0.63, 1.08). CONCLUSIONS: The available evidence suggested there was no significant difference between uncemented and cemented hemiarthroplasty in treating displaced femoral neck fractures.

Tourniquet used in anterior cruciate ligament reconstruction: a system review.

PURPOSE: To identify whether routine use of a tourniquet is a better choice for anterior cruciate ligament reconstruction. METHOD: We searched Amed, British Nursing Index, Embase, Pubmed, Scopus, Cochrane Library and Google Scholar. We used revised Jadad score to evaluate the trial quality. Each reference list was viewed for any ignored studies. Two reviews independently extracted data from all eligible trials, including study design, patients' characteristics, interventions and outcomes. The available data were using random effects models with mean differences for continuous variables. RESULTS: The only meta-analysis indicated there was no significant difference in operative time between the tourniquet and non-tourniquet groups (mean differences -5.71, 95 % CI -12.40, 0.99). The remaining outcomes had variations in the outcome measures, so it was not possible to perform meta-analysis. CONCLUSIONS: There was insufficient evidence to support the hypothesis that patients would benefit from routinely applying a tourniquet. More high-quality randomized controlled trials were needed to test the result.

Cryptococcosis of lumbar vertebra in a patient with rheumatoid arthritis and scleroderma: case report and literature review.

BACKGROUND: Although cryptococcosis mainly occurs in the central nervous system and lungs in immunocompromised hosts, it can involve any body site or structure. Here we report the first case of primary cryptococcosis of a lumbar vertebra without involvement of the central nervous system or lungs in a relatively immunocompromised individual with rheumatoid arthritis and scleroderma. CASE PRESENTATION: A 40-year-old Chinese woman with rheumatoid arthritis diagnosed 1 year beforehand and with a subsequent diagnosis of scleroderma was found to have an isolated cryptococcal infection of the fourth lumbar vertebra. Her main complaints were severe low back and left leg pain. Cryptococcosis was diagnosed by CT-guided needle biopsy and microbiological confirmation; however, serum cryptococcal antigen titer was negative. After 3 months of antifungal therapy with fluconazole the patient developed symptoms and signs of scleroderma, which was confirmed on laboratory tests. After taking fluconazole for 6 months, the progressive destruction of the lumbar vertebral body had halted and the size of an adjacent paravertebral mass had decreased substantially. On discharge symptoms had resolved and at an annual follow-up there was no evidence of recurrence on the basis of symptoms, signs or imaging investigations. CONCLUSION: Although cryptococcosis of the lumbar vertebra is extremely rare, it should be considered in the differential diagnosis for patients with lumbar vertebral masses to avoid missed diagnosis, misdiagnosis and diagnostic delay. Early treatment with antifungals proved to be a satisfactory alternative to surgery in this relatively immunocompromised patient. Any residual spinal instability can be treated later, once the infection has resolved.

Factors affecting the length of stay of patients with traumatic spinal cord injury in Tianjin, China.

PURPOSE: To describe the acute care length of stay (ACLOS) of adult patients with traumatic spinal cord injury (TSCI) in Tianjin, China, and identify the associated demographic and clinical factors. METHODS: TSCI patients admitted to a general hospital in Tianjin, China from 2004 to 2007 were identified. The predictor variables were demographic and clinical factors, including age, gender, etiology, level of injury, severity, associated injuries, surgery, and complications. The outcome variable was ACLOS. Multivariable linear regression analysis models were used to examine the association between predictor and outcome variables. RESULTS: This study included 631 TSCI patients. The mean ACLOS was 32.4 ± 37.7 days, with a range of 1-294 days. The median number of hospitalization days was 21 days. Admission to a suburban hospital surgery, urinary infection, poorer functional status, pressure ulcers, and associated injuries were significantly associated with ACLOS. CONCLUSION: This study examined the effect of epidemiological and clinical factors on ACLOS in Tianjin, China. The factors that influenced the ACLOS were different from factors reported in other studies. More studies are needed in China to determine the effect of these factors on ACLOS in TSCI patients and to propose a predictive model.

[The efficacy analysis of selective decompression of lumbar root canal of elderly lumbar spinal stenosis].

OBJECTIVE: To evaluate the effect of the treatments of lumbar spinal stenosis by selective decompression of lumbar root canal and laminectomy. METHODS: From March 2007 to March 2011, 144 lumbar spinal stenosis patients were treated by selective decompression of lumbosacral root canal and laminectomy. All of these patients included 64 male and 80 female patients, age range 60-87 years, average (66 ± 5) years. Duration 6-72 months, average (12 ± 16) months. The patients were divided into 2 groups according to surgical procedure underwent: group A including 70 patients who were treated with selective decompression of lumbar root canal, group B including 74 patients who were treated with traditional laminectomy. Five time points were selected to assess clinical effect using Oswestry disability index (ODI) and Japanese Orthopaedic Association (JOA), which were pre-operation and 1 month, 6 months, 12 months and last follow-up. The data were analyzed through Wilcoxon matched-pairs signed-ranks test. RESULTS: All operations were completed well without severe complications. The duration of follow-up was 12-55 months, average (31 ± 6) months. All patients' symptoms got improved or partial remission. The average pre- and post-operative scores of JOA in group A and B were from 14.0 ± 1.6 to 20.3 ± 1.7, from 13.6 ± 1.7 to 20.2 ± 2.0, respectively, there were significant statistical differences (Z = 2.41 and 2.23, P < 0.05). The average pre- and post-operative scores of ODI in group A and B were from 62% ± 4% to 28% ± 4%, from 63% ± 4% to 27% ± 3%, respectively, there were significant statistical differences (Z = 2.93 and 2.64, P < 0.05). CONCLUSIONS: Personalized treatment programs should be established for elderly lumbar spinal stenosis according to stenosis location. Laminectomy is carried out with the stenosis in the central spinal canal; selective decompression of lumbosacral root canal is accepted with the stenosis in the nerve root canal without central stenosis.

Treatment of three- and four-part proximal humeral fractures with locking proximal humerus plate.

OBJECTIVE: The purpose of this study was to evaluate the effectiveness and complications of the locking proximal humerus plate to treat proximal humerus fractures. DESIGN: A retrospective clinical trial. SETTING: Department of Orthopaedics, Tianjin Medical University General Hospital. PATIENTS: Sixty-eight consecutive patients with three- or four-part fractures of the proximal humerus were treated with locking proximal humerus plates. INTERVENTION: The deltopectoral anterolateral acromial approach was used to the proximal humerus; open reduction and locking proximal humerus plate were applied. MAIN OUTCOME MEASUREMENTS: Constant Score was used to measure the shoulder functional recovery, and Visual Analog Scale (VAS) was used to measure subjective evaluation of pain. The radiology was observed. RESULTS: After average 26.7 months, the average Constant Score was 72.6 ± 13.2 points and the average VAS was 1.2 ± 0.8 points. All the complications such as screw perforation into the glenohumeral joint, screws loosening, soft tissue infections, avascular necrosis and delayed union occurred in eight cases (11.8 %). CONCLUSIONS: The effectiveness of the locking proximal humerus plate was similar to other published literatures on treating fractures of the proximal humerus; however, a lower complications rate in short follow-up time was observed in this study. It may potentially provide a favorable option for treating three- or four-part fractures of the proximal humerus. Dealing with each particular fracture pattern, surgeons should have a decision of appropriate way to internal fixation.