ABSTRACT
OBJECTIVES@#To explore the physicochemical characteristics and biocompatibility of calcium peroxide (CPO)-loaded polycaprolactone (PCL) microparticle.@*METHODS@#The CPO/PCL particles were prepared. The morphology and elemental distribution of CPO, PCL and CPO/PCL particles were observed with scanning electron microscopy and energy dispersive spectroscopy, respectively. Rat adipose mesenchymal stem cells were isolated and treated with different concentrations (0.10%, 0.25%, 0.50%, 1.00%) of CPO or CPO/PCL particles. The mesenchymal stem cells were cultured in normal media or osteogenic differentiation media under the hypoxia/normoxia conditions, and the amount of released O2 and H2O2 after CPO/PCL treatment were detected. The gene expressions of alkaline phosphatase (ALP), Runt-associated transcription factor 2 (RUNX2), osteopontin (OPN) and osteocalcin (OCN) were detected by realtime RT-PCR. SD rats were subcutaneously injected with 1.00% CPO/PCL particles and the pathological changes and infiltration of immune cells were observed with HE staining and immunohistochemistry at day 7 and day 14 after injection.@*RESULTS@#Scanning electron microscope showed that CPO particles had a polygonal structure, PCL particles were in a small spherical plastic particle state, and CPO/PCL particles had a block-like crystal structure. Energy dispersive spectroscopy revealed that PCL particles showed no calcium mapping, while CPO/PCL particles showed obvious and uniform calcium mapping. The concentrations of O2 and H2O2 released by CPO/PCL particles were lower than those of CPO group, and the oxygen release time was longer. The expressions of Alp, Runx2, Ocn and Opn increased with the higher content of CPO/PCL particles under hypoxia in osteogenic differentiation culture and normal culture, and the induction was more obvious under osteogenic differentiation conditions (all P<0.05). HE staining results showed that the muscle tissue fibers around the injection site were scattered and disorderly distributed, with varying sizes and thicknesses at day 7 after particle injection. Significant vascular congestion, widened gaps, mild interstitial congestion, local edema, inflammatory cell infiltration, and large area vacuolization were observed in some tissues of rats. At day 14 after microparticle injection, the muscle tissue around the injection site and the tissue fibers at the microparticle implantation site were arranged neatly, and the gap size was not thickened, the vascular congestion, local inflammatory cell infiltration, and vacuolization were significantly improved compared with those at day 7. The immunohistochemical staining results showed that the expressions of CD3 and CD68 positive cells significantly increased in the surrounding muscle tissue, and were densely distributed in a large area at day 7 after particle injection. At day 14 of microparticle injection, the numbers of CD3 and CD68 positive cells in peripheral muscle tissue and tissue at the site of particle implantation were lower than those at day 7 (all P<0.01).@*CONCLUSIONS@#CPO/PCL particles have good oxygen release activity, low damage to tissue, and excellent biocompatibility.
Subject(s)
Rats , Animals , Osteogenesis , Core Binding Factor Alpha 1 Subunit , Rats, Sprague-Dawley , Hydrogen Peroxide/pharmacology , Cell Differentiation , Oxygen , Hypoxia , Cells, CulturedABSTRACT
Aiming at the problems of missing important features, inconspicuous details and unclear textures in the fusion of multimodal medical images, this paper proposes a method of computed tomography (CT) image and magnetic resonance imaging (MRI) image fusion using generative adversarial network (GAN) and convolutional neural network (CNN) under image enhancement. The generator aimed at high-frequency feature images and used double discriminators to target the fusion images after inverse transform; Then high-frequency feature images were fused by trained GAN model, and low-frequency feature images were fused by CNN pre-training model based on transfer learning. Experimental results showed that, compared with the current advanced fusion algorithm, the proposed method had more abundant texture details and clearer contour edge information in subjective representation. In the evaluation of objective indicators, Q AB/F, information entropy (IE), spatial frequency (SF), structural similarity (SSIM), mutual information (MI) and visual information fidelity for fusion (VIFF) were 2.0%, 6.3%, 7.0%, 5.5%, 9.0% and 3.3% higher than the best test results, respectively. The fused image can be effectively applied to medical diagnosis to further improve the diagnostic efficiency.
Subject(s)
Image Processing, Computer-Assisted/methods , Neural Networks, Computer , Tomography, X-Ray Computed , Magnetic Resonance Imaging/methods , AlgorithmsABSTRACT
Objective:To compare the clinical and imaging outcomes of fascia lata autograft bridging repair reinforecd with an artificial ligament as the internal brace with the autograft bridging repair for the treatment of irreparable massive rotator cuff tears (IMRCTs).Methods:The data of 26 patients with IMRCT who underwent fascia lata autograft bridging repair augmented with artificial ligament as the internal brace (internal brace group) and of 24 patients with IMRCT who underwent bridging autograft repair alone (control group) were retrospectively evaluated preoperatively and at 2-year follow-up. Clinical outcomes were assessed using shoulder activity, the American Shoulder and Elbow Surgeons (ASES) Score, University of California Los Angeles (UCLA) Score, and visual analogue scale (VAS) for pain. Imaging outcomes were evaluated using acromiohumeral distance (AHD), Goutallier grade, and status of fascia lata grafts according to radiographs or magnetic resonance imaging results.Results:All 50 cases were followed up for 34.2±7.2 months (range 24-45 months). Compared to the control group, the internal brace group showed better ASES score (93.5±5.3 vs. 89.5±5.7, P<0.05), UCLA score (31.7±3.8 vs. 28.5±5.6, P<0.05), improvement in UCLA score (19.6±4.2 vs. 15.9±5.7, P<0.05), active elevation (167.3°±8.4° vs. 159.4°±13.6°, P<0.05), abduction strength (8.9±1.2 vs. 8.2±1.2, P<0.05), improvement in abduction strength (4.1±1.2 vs. 3.3± 1.0, P<0.05), AHD (7.0±1.4 mm vs. 5.9±1.0 mm, P<0.05), improvement in AHD (3.3±1.5 mm vs. 2.0±0.6 mm, P<0.05), and healing rate of fascia lata autografts (92% vs. 54%, P<0.05) at 2-year follow-up. Conclusion:Fascia lata autograft bridging repair reinforced with an artificial ligament as the internal brace improves healing rate of bridging graft and postoperatively short-term clinical outcomes of patients with IMRCT.
ABSTRACT
【Objective】 To investigate the effects of one-stage additional posterior pedicle screws （PPS） internal fixation on early Cage subsidence after oblique lateral interbody fusion （OLIF）. 【Methods】 We made a retrospective analysis of 118 patients with lumbar degenerative diseases treated with OLIF at the Department of Orthopedics， Sir Run Run Shaw Hospital， School of Medicine， Zhejiang University， from January 2016 to December 2019. We divided the patients into OLIF stand-alone group （58 ones） and OLIF with PPS fixation group （60 ones） according to the surgical procedure. All the patients had preoperative frontal and lateral radiographs of the lumbar spine， and CT and MR scans were performed. The clinical outcomes and reoperation rates of the two groups were compared at immediate postoperative follow-up and at 1， 3， 6 and 12 months. X-ray and CT examinations were performed to assess Cage subsidence in both groups at each postoperative follow-up. 【Results】 There was no statistical difference between the two groups in baseline data and surgical segmentation. Of the 118 patients with 141 discs who underwent OLIF surgery， 58 patients with 68 discs received OLIF stand-alone surgery and 60 ones with 73 discs received OLIF with PPS fixation. There were no significant differences in intraoperative bleeding， complications， or postoperative clinical outcomes between the two groups （P>0.05）， and the Cage subsidence rate was 22.4% in OLIF stand-alone group and 5% in OLIF with PPS fixation group， with significant difference between the two groups （P<0.01）. 【Conclusion】 Both OLIF stand-alone and OLIF additional PPS fixation can achieve good early clinical outcomes， and first-stage additional PPS fixation can significantly reduce the occurrence of Cage subsidence in the early postoperative period after OLIF.