Name: synovial fluid analysis to identify osteoarthritis
Uploaded: 2022-10-20T14:30:00
Description: Watch this Scientific Journal Video about Synovial Fluid Analysis to Identify Osteoarthritis at JoVE.com

The Authors wish to acknowledge Professor Leonardo Punzi for his precious mentorship in the field of synovial fluid analysis and Padova University Hospital for its support.

The present protocol complies with the guidelines of the Ethics committee of Padova University Hospital. SF was collected with patient consent from the knee joints of patients receiving therapeutic arthrocentesis for joint effusion at their initial presentation to the clinic or in response to an arthritic flare. Contraindications to the procedure were: coagulopathy, anticoagulant medications, skin lesions, dermatitis, or cellulitis overlying the joint. All SF samples were deidentified.
1...

<ol>
	<li>Cui, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Global,+regional+prevalence,+incidence+and+risk+factors+of+knee+osteoarthritis+in+population-based+studies.">Global, regional prevalence, incidence and risk factors of knee osteoarthritis in population-based studies.</a> EClinicalMedicine. 29, 100587 (2020).</li><li>Hunter, D. J., Bierma-Zeinstra, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Osteoarthritis.">Osteoarthritis.</a> Lancet. 393 (10182), 1745-1759 (2019).</li><li>Mandell, B. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Synovial Fluid Analysis and the Evaluation of Patients with Arthritis. , (2022).</li><li>Schmerling, R. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Guidelines+for+the+initial+evaluation+of+the+adult+patient+with+acute+musculoskeletal+symptoms.">Guidelines for the initial evaluation of the adult patient with acute musculoskeletal symptoms.</a> Arthritis &amp; Rheumatism. 39 (1), 1-8 (1996).</li><li>Coakley, G., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RCGP+and+BSAC+guidelines+for+management+of+the+hot+swollen+joint+in+adults.">RCGP and BSAC guidelines for management of the hot swollen joint in adults.</a> Rheumatology. 45 (8), 1039-1041 (2006).</li><li>Frallonardo, P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Basic+calcium+phosphate+and+pyrophosphate+crystals+in+early+and+late+osteoarthritis:+relationship+with+clinical+indices+and+inflammation.">Basic calcium phosphate and pyrophosphate crystals in early and late osteoarthritis: relationship with clinical indices and inflammation.</a> Clinical Rheumatology. 37 (10), 2847-2853 (2018).</li><li>Nalbant, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synovial+fluid+features+and+their+relations+to+osteoarthritis+severity:+new+findings+from+sequential+studies.">Synovial fluid features and their relations to osteoarthritis severity: new findings from sequential studies.</a> Osteoarthritis Cartilage. 11 (1), 50-54 (2003).</li><li>Fuerst, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Calcification+of+articular+cartilage+in+human+osteoarthritis.">Calcification of articular cartilage in human osteoarthritis.</a> Arthritis &amp; Rheumatism. 60 (9), 2694-2703 (2009).</li><li>Campillo-Gimenez, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inflammatory+potential+of+four+different+phases+of+calcium+pyrophosphate+relies+on+NF-&#954;B+activation+and+MAPK+pathways.">Inflammatory potential of four different phases of calcium pyrophosphate relies on NF-&#954;B activation and MAPK pathways.</a> Frontiers in Immunology. 9, 2248 (2018).</li><li>Paz&#225;r, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Basic+calcium+phosphate+crystals+induce+monocyte/macrophage+IL-1&#946;+secretion+through+the+NLRP3+inflammasome+in+vitro.">Basic calcium phosphate crystals induce monocyte/macrophage IL-1&#946; secretion through the NLRP3 inflammasome in vitro.</a> The Journal of Immunology. 186 (4), 2495-2502 (2011).</li><li>Mart&#237;n, M. J. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Automated+cell+count+in+body+fluids:+a+review.">Automated cell count in body fluids: a review.</a> Advances in Laboratory Medicine. 2, 149-161 (2021).</li><li>Seghezzi, , et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Optimization+of+cellular+analysis+of+synovial+fluids+by+optical+microscopy+and+automated+count+using+the+Sysmex+XN+body+fluid+mode.">Optimization of cellular analysis of synovial fluids by optical microscopy and automated count using the Sysmex XN body fluid mode.</a> Clinica Chimica Acta. 462, 41-48 (2016).</li><li>Reginato, A. J., Maldonado, I., Reginato, A. M., Falasca, G. F., O'Connor, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Supravital+staining+of+synovial+fluid+with+Testsimplets.">Supravital staining of synovial fluid with Testsimplets.</a> Diagnostic Cytopathology. 8 (2), 147-152 (1992).</li><li>Lumbreras, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+for+crystals+in+synovial+fluid:+training+of+the+analysts+results+in+high+consistency.">Analysis for crystals in synovial fluid: training of the analysts results in high consistency.</a> Annals of the Rheumatic Diseases. 64 (4), 612-615 (2005).</li><li>Tieng, A., Franchin, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Knee+arthrocentesis+in+adults.">Knee arthrocentesis in adults.</a> Journal of Visualized Experiments. , e63135 (2022).</li><li>Punzi, L., Oliviero, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Arthrocentesis+and+synovial+fluid+analysis+in+clinical+practice:+value+of+sonography+in+difficult+cases.">Arthrocentesis and synovial fluid analysis in clinical practice: value of sonography in difficult cases.</a> Annals of the New York Academy of Sciences. 1154 (1), 152-158 (2009).</li><li>Schumacher, H. R., Reginato, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Atlas of Synovial Fluid Analysis and Crystal Identification. , (1991).</li><li>Mopin, A., Driss, V., Brinster, C. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detailed+protocol+for+characterizing+the+murine+C1498+cell+line+and+its+associated+leukemia+mouse+model.">Detailed protocol for characterizing the murine C1498 cell line and its associated leukemia mouse model.</a> Journal of Visualized Experiments. (116), e54270 (2016).</li><li>Oliviero, F., Punzi, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Basics+of+Polarized+Light+Microscopy.">Basics of Polarized Light Microscopy.</a> Synovial Fluid Analysis and the Evaluation of Patients with Arthritis. , 79-90 (2022).</li><li>Paul, H., Reginato, A. J., Schumacher, H. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alizarin+red+S+staining+as+a+screening+test+to+detect+calcium+compounds+in+synovial+fluid.">Alizarin red S staining as a screening test to detect calcium compounds in synovial fluid.</a> Arthritis &amp; Rheumatism. 26 (2), 191-200 (1983).</li><li>Favero, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synovial+fluid+fetuin-A+levels+in+patients+affected+by+osteoarthritis+with+or+without+evidence+of+calcium+crystals.">Synovial fluid fetuin-A levels in patients affected by osteoarthritis with or without evidence of calcium crystals.</a> Rheumatology. 58 (4), 729-730 (2019).</li><li>Frallonardo, P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Detection+of+calcium+crystals+in+knee+osteoarthritis+synovial+fluid:+a+comparison+between+polarized+light+and+scanning+electron+microscopy.">Detection of calcium crystals in knee osteoarthritis synovial fluid: a comparison between polarized light and scanning electron microscopy.</a> Journal of Clinical Rheumatology. 22 (7), 369-371 (2016).</li><li>Peffers, M. J., Smagul, A., Anderson, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proteomic+analysis+of+synovial+fluid:+current+and+potential+uses+to+improve+clinical+outcomes.">Proteomic analysis of synovial fluid: current and potential uses to improve clinical outcomes.</a> Expert Review of Proteomics. 16 (4), 287-302 (2019).</li></ol>

In OA, SF analysis helps define disease characteristics through simple steps: total and differential leukocyte counts and searching for crystals, including CPP and BCP. Furthermore, the detection of MSU crystals may highlight important comorbidities.
Despite low costs and simple execution, the sensibility of the tests and reliability of the results may be affected due to inexperienced analysts-mainly as it pertains to crystal identification. Training and experience of the analyst are crucial i...

Osteoarthritis (OA) is a complex and multifactorial chronic joint disease, with an estimated pooled global prevalence of 16% in subjects aged 15 and over, and 23% in subjects aged 40 and over1. The incidence of OA is expected to increase due to an aging population and an increase in risk factors, such as obesity and metabolic syndrome2.
Among the major issues associated with OA are the difficulty in diagnosing the disease in its early stages and currently available treatments limited to pain management and symptomatic slow-acting drugs (SYSADOAs) such as glycosaminoglycans. The diagnosis of OA is based on clinical symptoms and imaging findings. However, the lack of correlation between the two assessments can cause years of delay in OA diagnosis and treatment initiation2. OA is characterized by degenerative processes and low-grade inflammation, which can be easily investigated via synovial fluid (SF) analysis. SF is a viscous plasmatic dialysate rich in hyaluronic acid, which lubricates the joint space, provides nutrients and oxygen to cartilage, and removes metabolic waste. SF also acts as a shock absorber, thus protecting the joints during stress and strain3.
SF analysis is a simple and reliable method that must always be performed during the initial evaluation of patients with musculoskeletal symptoms and joint effusions3. Recommendations from the American College of Rheumatology, the British Society for Rheumatology, and others include SF analysis among the diagnostic testing for rheumatic diseases that must be undertaken mainly in evaluating acute monoarthritis4,5. Total and differential leucocyte counts obtained from SF analysis provide a snapshot of the pathological process occurring in the joint, thus classifying the degree of inflammation. The identification of pathogenic crystals, such as monosodium urate (MSU) and calcium pyrophosphate (CPP) crystals, under polarized light, is vital in the diagnosis and treatment of crystal arthritis (e.g., gout and pseudogout). Furthermore, the presence of microorganisms suggests a diagnosis of septic arthritis.
Calcium crystals are frequent in samples collected from patients with OA6. Basic calcium phosphate (BCP) crystals and CPP have been reported in approximately 22% and 23% of SF samples, respectively, from patients with OA6. Although their role remains unclear, these crystals have been associated with more severe forms of OA7 and are considered an epiphenomenon of the pathological process itself. Calcium crystals have been detected in 100% of tissue samples from OA patients undergoing knee replacement8. Furthermore, it has been hypothesized that calcium crystals may be involved in the pathogenesis of OA owing to their inflammatory effects, demonstrated by several studies9 and mediated, at least in part, by the NLRP3 inflammasome10.
More recently, calcium crystals have been described in both early and late stages6 of OA, indicating that they may play a vital role in diagnosing different clinical subsets of OA and pharmacological treatment.
The overall goal of SF analysis is twofold: to determine the inflammatory degree of SF and to diagnose crystal or septic arthritis by identifying specific crystals or microorganisms. It is a particularly useful, simple, and reliable tool in diagnosing OA, owing to the typical non-inflammatory pattern with a very low percentage or absence of neutrophils.
Advantages over alternative techniques 
SF analysis consists of simple procedures that include total and differential leucocyte counts and crystal search. Manual cell counting performed by expert laboratory technicians3,11 remains the gold standard for the cytological analysis of synovial and other body fluids. However, due to the time-consuming limitation and the inter- and intra-observer variability of this method, automated cell counters have gradually replaced manual counting in large routine clinical laboratories where blood and urine analyzers have been adapted to enable SF analysis11,12. Nevertheless, manual counting presents some advantages in specific settings: (1) in the ambulatory, to obtain a total and differential WBC value on time; (2) to identify cell types such as cytophagocytic mononuclear (Reiter) cells or non-hematopoietic cells such as synoviocytes, that automated counters cannot recognize; (3) when the sample is too small to be handled by the instrument; (4) to create local laboratory registries that are readily accessible for research purposes. Another advantage of manual counting is seen insupravital staining, a method that allows the differentiation of cells very quickly and immediately after glass slide preparation. By contrast, traditional stainings, such as the Wright and the May-Gr&#252;nwald-Giemsa procedures, require air-dried SF smears and time to stain the cells13. Although not suitable for time-sensitive routine analyses, these staining methods reveal more detailed cell populations in the sample, including erythrocytes, basophils, eosinophils, polymorphonuclear leukocytes, lymphocytes, and platelets.
Finally, routine SF analysis for crystals is performed using a simple technique based on polarized light microscopy, which provides fast results14. Alternative methods, such as scanning and electron microscopy, yield more accurate and sensitive results, but their use in everyday clinical practice is not feasible due to high costs and time-consuming sample preparation and analysis.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Alizarin red S</td>
			<td>Merck</td>
			<td>A5533</td>
			<td>For BCP crystal search</td>
		</tr>
		<tr>
			<td>Burker chamber</td>
			<td>Merck</td>
			<td>BR718905</td>
			<td>For total white blood cell count</td>
		</tr>
		<tr>
			<td>Cover glasses</td>
			<td>Merck</td>
			<td>C7931</td>
			<td>For microscopic examination&#160;</td>
		</tr>
		<tr>
			<td>EDTA tubes</td>
			<td>BD</td>
			<td>368861</td>
			<td>For SF collection&#160;</td>
		</tr>
		<tr>
			<td>Glass slides&#160;</td>
			<td>Merck</td>
			<td>S8902</td>
			<td>For crystal search</td>
		</tr>
		<tr>
			<td>Lambda filter (compensator)</td>
			<td>Any&#160;</td>
			<td>Refer to microscope company</td>
			<td>For crystal identification&#160;</td>
		</tr>
		<tr>
			<td>Malassez-Potain pipette</td>
			<td>Artiglass</td>
			<td>54830000</td>
			<td>For dilution of synovial fluid</td>
		</tr>
		<tr>
			<td>Methylene blue solution</td>
			<td>Merck</td>
			<td>3978</td>
			<td>For total white blood cell count</td>
		</tr>
		<tr>
			<td>Polarized microscope&#160;</td>
			<td>Leica, Nikon, others</td>
			<td>Depending on the model and company</td>
			<td>For complete synovial fluid analysis</td>
		</tr>
		<tr>
			<td>Polarizing lens</td>
			<td>Any&#160;</td>
			<td>Refer to microscope company</td>
			<td>For crystal identification&#160;</td>
		</tr>
		<tr>
			<td>Testsimplet&#160;</td>
			<td>Waldeck</td>
			<td>14386</td>
			<td>Supravital staining for cell differentiation</td>
		</tr>
	</tbody>
</table>

synovial fluid analysis to identify osteoarthritis

Synovial fluid (SF) analysis is important in diagnosing osteoarthritis (OA). Macroscopic and microscopic features, including total and differential white blood cell (WBC) count, help define the non-inflammatory nature of SF, which is a hallmark of OA. In patients with OA, WBC in SF samples usually does not exceed 2000 cells per microliter, and the percentage of inflammatory cells, such as neutrophils, is very low or absent. Calcium crystals are frequent in SF collected from OA patients. Although their role in the pathogenesis of OA remains unclear, they have been associated with a mild inflammatory process and a more severe disease progression. Recently, calcium crystals have been described in both the early and late stages of OA, indicating that they may play a vital role in diagnosing different clinical subsets of OA and pharmacological treatment. The overall goal of SF analysis in OA is two-fold: to ascertain the non-inflammatory degree of SF and to highlight the presence of calcium crystals.

Large joints affected by OA are often swollen and produce significant amounts of SF, which are drained via arthrocentesis15. The macroscopic characteristics of SF evaluated immediately after arthrocentesis essentially include the quantity, color, clarity, and viscosity17. Despite their low specificity, they provide preliminary data on the degree of inflammation. The color depends on SF cellularity and the degree of fragmentation of extracellular matrix macromolecul...

Watch this Scientific Journal Video about Synovial Fluid Analysis to Identify Osteoarthritis at JoVE.com

Synovial Fluid Analysis to Identify Osteoarthritis

Synovial fluid analysis under transmitted, polarized, and compensated light microscopy is used to evaluate the inflammatory or non-inflammatory nature of a sample through simple steps. It is particularly useful in osteoarthritis to detect calcium crystals and identify a more severe subset of osteoarthritis.

Synovial fluid (SF) analysis is important in diagnosing osteoarthritis (OA). Macroscopic and microscopic features, including total and differential white ...

Synovial fluid analysis can reveal the degree of inflammation and the presence of pathogenic crystals during the initial evaluation of patient with musculoskeletal symptoms and joint effusions. The main advantage of this technique is its simplicity and reliability. In a few steps, the clinician can obtain important diagnostic information on the patient's disease.The identification of specific crystals is vital for diagnosis and treatment. Urate crystals indicate gout, whereas calcium pyrophosphate and other calcium crystals indicate calcium-related arthropathies or a more severe form of osteoarthritis. To begin, take the synovial fluid sample collected during arthrocentesis of swollen joints of patients.Annotate the volume of the sample in milliliters and transfer it separately into a tube containing anticoagulant EDTA and another tube without any additive. In the suspected cases of infection, aseptically transfer a few milliliters of the synovial fluid sample into a culture bottle for microbiological testing. To examine the sample macroscopically, take a tube containing the sample and define the color of the sample, which can range from pale to dark yellow.Record the presence of blood, if any. Define the degree of clarity of the sample by observing it in the backlight and by determining the ease of reading a printed page through the tube containing the sample. Then assess the viscosity of the sample by dripping it from a disposable pipette.While the appearance of a long string of liquid indicates high viscosity, the formation of drops is indicative of low viscosity. Observe the sample through the tube with light in the background for the presence of any particulate materials including tissue fragments or fibrin. To determine the total white blood cell count, draw 0.5 microliters of the sample from the tube containing EDTAA using a Malassez-Potain pipette.Use the same pipette to draw 9.5 microliters of 0.1%methylene blue solution. Mix the sample and methylene blue solution in the pipette by gentle inversion. Discard the first few drops before pouring the mixture into the counting chamber of a hemocytometer.Now count the cells in two consecutive squares out of nine and multiply the obtained number by 100. Express the total white blood cell count as the number of leukocytes per cubic millimeter. Use the synovial fluid sample from the tube without any additive to determine the differential white blood cell count of the synovial fluid samples.To determine the differential cell count using supravital staining, take a ready-to-use slide pre-coated with crystal violet and methylene blue and place one small drop of sample in the center of the slide. Next, cover the sample drop with a coverslip and place a drop of microscope immersion oil on the coverslip. To use traditional staining for estimating the differential cell count, begin by putting a small drop of the sample at the end of a clean slide.Now use a second slide or a coverslip to spread the drop along the slide with a forward movement. Let the smear dry in the air. Examine the slide containing the air dried smear under 1, 000X oil immersion objective.Estimate the differential cell count by counting 100 consecutive cells while distinguishing the polymorphonuclear cells, the monocytes, and the lymphocytes from one another. Clean a glass slide with optical or soft paper imbibed with ethanol. Apply a small drop of the sample not mixed with any additive on the glass slide and cover it with a coverslip before placing the slide under the microscope.Focus the slide under the microscope using a low power magnification objective and carefully examine it under a bright field with a 40X objective. Look inside and outside the cells to identify the crystals according to their size and shape, which may be rhomboidal, needle shaped, or rod shaped. Then insert the polarizing filter between the light source and the specimen.To create a dark background, rotate the polarizer until its optical axis is perpendicular to the analyzer. Once a birefringent crystal has been identified, insert the compensator between the polarizer and the specimen and move it parallel or perpendicular to the optical axis of the crystal. Observe the color revealed by the crystal.For Alizarin Red staining, mix a drop of the synovial fluid sample with an equal volume of previously prepared Alizarin Red solution on a clean slide. Cover the slide with a coverslip and examine at 400X magnification under a microscope to identify the crystals. The macroscopic characteristics of synovial fluid samples indicated the degree of inflammation.A sample with pale yellow color and more clarity is generally associated with non-inflammatory conditions such as osteoarthritis. On the other hand, a sample having dark yellow color and a turbid appearance indicates the presence of cells, debris, hyaluronic acid, and fibrin fragments which are associated with inflammatory effusions. The leukocytes observed in synovial fluid samples from osteoarthritis patients were mostly monocytes and other mononuclear cells like synoviocytes.Calcium pyrophosphate crystals were detected in synovial fluid samples indicating relatively higher levels of inflammatory cytokines. Moreover, a positive Alizarin Red staining revealed the presence of basic calcium phosphate crystals in the samples. It is very important to carefully examine the slide under ordinary light when searching for crystals.Remember that pyrophosphate crystals are often weakly birefringent and can be missed under polarized light. The presence of calcium crystals in synovial fluid and their association with more severe form of disease have led researchers to explore new mechanisms in the pathogenesis and the progression of osteoarthritis.

synovial-fluid-analysis-to-identify-osteoarthritis

Research

JoVE Journal

Medicine

Isolation and Cellular Phenotyping of Mesenchymal Stem Cells Derived from Synovial Fluid and Bone Marrow of Minipigs

Mesenchymal stem cells (MSCs) have been established after isolation from various tissue sources, including bone marrow and synovial fluid. Recently, synovial-fluid-derived MSCs were reported to have multi-lineage differentiation potential and immunomodulatory features, which indicates that these cells can be used for tissue engineering and systemic treatments. This study presents a protocol for simple and non-invasive isolation of MSCs derived from the bone marrow and synovial fluid of minipigs to analyze cell surface markers for cell phenotyping and in vitro culturing. Using sexually mature six-month-old minipigs, bone marrow was extracted from the iliac crest bone using a bone marrow extractor, and the synovial fluid was aspirated from the femorotibial joint. Procedures for the collection of samples from both sources were non-invasive. The protocols for effective isolation of MSCs from harvested cell sources and for creating in vitro culture conditions to expand stable MSCs from minipigs and the application of systemic autologous treatments are provided. For cell phenotyping, the cell surface markers of both cells were analyzed using flow cytometry. In the results, the MSCs were isolated from the synovial fluid of the minipigs and showed that synovial-fluid-derived MSCs have a similar morphology and cell phenotype to bone-marrow-derived MSCs. Therefore, non-invasively obtained synovial fluid is a valuable source of MSCs.

A protocol establishing mesenchymal stem cells (MSCs) isolated from the synovial fluid and bone marrow of minipigs and non-invasively collected using syringe aspiration is presented. Cellular phenotyping was performed using flow cytometry after cell isolation and in vitro cultivation of bone marrow and synovial fluids derived from MSCs.

Mesenchymal stem cells (MSCs) have been established after isolation from various tissue sources, including bone marrow and synovial fluid. Recently, ...

Flow Cytometry Analysis of Immune Cell Subsets within the Murine Spleen, Bone Marrow, Lymph Nodes and Synovial Tissue in an Osteoarthritis Model

Osteoarthritis (OA) is one of the most prevalent musculoskeletal diseases, affecting patients suffering from pain and physical limitations. Recent evidence indicates a potential inflammatory component of the disease, with both T-cells and monocytes/macrophages potentially associated with the pathogenesis of OA. Further studies postulated an important role for subsets of both inflammatory cell lineages, such as Th1, Th2, Th17, and T-regulatory lymphocytes, and M1, M2, and synovium-tissue-resident macrophages. However, the interaction between the local synovial and systemic inflammatory cellular response and the structural changes in the joint is unknown. To fully understand how T-cells and monocytes/macrophages contribute towards OA, it is important to be able to quantitively identify these cells and their subsets simultaneously in synovial tissue, secondary lymphatic organs and systemically (the spleen and bone marrow). Nowadays, the different inflammatory cell subsets can be identified by a combination of cell-surface markers making multi-color flow cytometry a powerful technique in investigating these cellular processes. In this protocol, we describe detailed steps regarding the harvest of synovial tissue and secondary lymphatic organs as well as generation of single cell suspensions. Furthermore, we present both an extracellular staining assay to identify monocytes/macrophages and their subsets as well as an extra- and intra-cellular staining assay to identify T-cells and their subsets within the murine spleen, bone marrow, lymph nodes and synovial tissue. Each step of this protocol was optimized and tested, resulting in a highly reproducible assay that can be utilized for other surgical and non-surgical OA mouse models.

Here, we describe a detailed and reproducible flow cytometry protocol to identify monocyte/macrophage and T-cell subsets using both extra- and intracellular staining assays within the murine spleen, bone marrow, lymph nodes and synovial tissue, utilizing an established surgical model of murine osteoarthritis.

Osteoarthritis (OA) is one of the most prevalent musculoskeletal diseases, affecting patients suffering from pain and physical limitations. Recent ...

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Early detection and management of fluid overload are critically important in acute illness, as the impact of therapeutic intervention can result in decreased or increased mortality rates. Accurate fluid status assessment entails appropriate therapy. Unfortunately, as the gold standard method of radioisotopic fluid measurement is costly, time-consuming, and lacks sensitivity in the acute care clinical setting, other less-accurate methods are typically used, such as clinical examination or 24 h output. Bioelectrical impedance vectorial analysis (BIVA) is an alternative impedance-based approach, where the raw parameter resistance and reactance of a subject are plotted to produce a vector, the position of which can be evaluated relative to tolerance intervals in an R-Xc graph. The fluid status is then interpreted as normal or abnormal, based on the distance from the mean vector derived from a healthy reference population. The objective of the present study is to demonstrate how to evaluate the presence of fluid overload through bioelectrical impedance vectorial analysis and the impedance ratio measured with tetrapolar multi-frequency equipment in patients admitted to the emergency department.

In this study, we demonstrate how to evaluate the presence of fluid overload through bioelectrical impedance vectorial analysis (BIVA) and the impedance ratio measured using tetrapolar multi-frequency equipment in patients admitted to the emergency department. BIVA and impedance ratio are reliable and useful tools to predict poor outcomes.

Early detection and management of fluid overload are critically important in acute illness, as the impact of therapeutic intervention can result in ...

Ameliorating Osteoarthritis in Mice Using Silver Nanoparticles

Knee osteoarthritis (KOA) is one of the most commonly encountered degenerative diseases of the joints in people over 45 years of age. Currently, there are not any effective therapeutics for KOA,and the only end-point strategy is total knee arthroplasty (TKA); therefore, KOA is associated with economic burdens and societal costs. The immune inflammatory response is involved in the occurrence and development of KOA. We previously established a mouse model of KOA using type II collagen. Hyperplasia of the synovial tissue was present in the model, alongside a large number of infiltrated inflammatory cells. Silver nanoparticles have substantial anti-inflammatory effects and have been widely used in tumor therapy and surgical drug delivery. Therefore, we evaluated the therapeutic effects of silver nanoparticles in a collagenase II-induced KOA model. The experimental results showed that silver nanoparticles significantly reduced synovial hyperplasia and the infiltration of neutrophils in the synovial tissue. Hence, this work demonstrates the identification of a novel strategy for OA and provides a theoretical basis for preventing the progress of KOA.

Presented here is a protocol for using silver nanoparticles to effectively ameliorate the acute symptoms of type II collagenase-induced osteoarthritis mice, including synovial inflammation, synovial hyperplasia, vascular hyperplasia, etc.

Knee osteoarthritis (KOA) is one of the most commonly encountered degenerative diseases of the joints in people over 45 years of age. Currently, there are ...

Standardized Tuina Manipulation for Knee Osteoarthritis in Rats

Tuina Manipulation to Reduce Inflammation and Cartilage Loss in Knee Osteoarthritis Rats

Clinical trials suggest that Tuina manipulation is effective in treating knee osteoarthritis (KOA), while further studies are required to discover its mechanism. Therefore, the manipulation of animal models of knee osteoarthritis is critical. This protocol provides a standard process for Tuina manipulation on KOA rats and a preliminary exploration of the mechanism of Tuina for KOA. The press and kneading manipulation method (a kind of Tuina manipulation that refers to pressing and kneading the specific area of the body surface) is applied on 5 acupoints around the knee joint of rats. The force and frequency of the manipulation were standardized by finger pressure recordings, and the position of the rat during manipulation is described in detail in the protocol. The effect of manipulation can be measured by pain behavior tests and microscopic findings in synovial and cartilage. KOA rats showed significant improvement in pain behavior. The synovial tissue inflammatory infiltration was reduced in the Tuina group, and the expression of tumor necrosis factor (TNF)-&#945; was significantly lower. Compared to the control group, chondrocyte apoptosis was less in the Tuina group. This study provides a standardized protocol for Tuina manipulation on KOA rats and preliminary proof that the therapeutic effects of Tuina may be related to reducing synovial inflammation and delayed chondrocyte apoptosis.

Author Spotlight: Understanding the Mechanism of Tuina Manipulation in Rats 

We present a protocol for Tuina manipulation performed on plaster-immobilized-induced knee osteoarthritis rats. Based on the preliminary results, it suggested that the efficacy of the method relied on the reduction of inflammation and cartilage loss.

Clinical trials suggest that Tuina manipulation is effective in treating knee osteoarthritis (KOA), while further studies are required to discover its ...

Treating Knee Osteoarthritis with Tuina in a Rabbit Model

Tuina Intervention in Rabbit Model of Knee Osteoarthritis

Knee osteoarthritis (KOA) is mainly characterized by degenerative changes in the knee joint's cartilage and surrounding soft tissues. The efficacy of Tuina in treating KOA has been confirmed, but the underlying mechanism needs to be investigated. This study aims to establish a scientifically feasible KOA rabbit model treated with Tuina to reveal the underlying mechanisms. For this, 18, 6-month-old normal-grade male New Zealand rabbits were randomly divided into sham, model, and Tuina groups, with 6 rabbits in each group. The KOA model was established by injecting 4% papain solution into the knee joint cavity. The Tuina group was intervened with Tuina combined with the knee joint rotary correction method for 4 weeks. Only the standard grasping and fixation were performed in sham and model groups. At the end of the 1-week intervention, the knee joint range of motion (ROM) was observed, and cartilage hematoxylin-eosin (HE) staining was done. The study shows that Tuina could inhibit chondrocyte apoptosis, repair cartilage tissue, and restore knee joint ROM. In conclusion, this study demonstrates the scientific feasibility of Tuina treatment for KOA model rabbits, highlighting its potential application in the study of KOA and similar knee joint-related conditions.

Author Spotlight: Using a Rabbit Model to Explore the Efficacy of Tuina in Treating Knee Osteoarthritis 

The protocol describes a method for Tuina intervention in a rabbit model of knee osteoarthritis.

Knee osteoarthritis (KOA) is mainly characterized by degenerative changes in the knee joint's cartilage and surrounding soft tissues. The efficacy of ...

Experimental Modeling of Knee Osteoarthritis in Rats

After anesthetizing the rat, use a shaving machine to remove the hair of the right hind limb. Then, place a medical cotton pad between the right ankle and hip joint. Fix the right knee joint at 180 degree extension using five to six layers of wet plaster bandage evenly.Spiral wrap the plaster bandage starting from the ankle and covering one-third of the previous one. Use a hairdryer to dry and harden the plaster. After the plaster bandage dries and hardens, mix the denture base materials to make it sticky.And externally wrap the plaster with denture based materials to fix and prevent it from gnawing. Once the mixture hardens, turn off the anesthesia machine and supervise the blood circulation in the terminal limb. Then, wait for the rat to wake up naturally.After three weeks of continuous immobilization, using surgical scissors, cut off the denture base material outside and plaster bandage. Rinse the lower limb of the rat with saline and dry it with gauze.

A Reproducible Cartilage Impact Model to Generate Post-Traumatic Osteoarthritis in the Rabbit

Post-traumatic osteoarthritis (PTOA) is responsible for 12% of all osteoarthritis cases in the United States. PTOA can be initiated by a single traumatic event, such as a high-impact load acting on articular cartilage, or by joint instability, as occurs with anterior cruciate ligament rupture. There are no effective therapeutics to prevent PTOA currently. Developing a reliable animal model of PTOA is necessary to better understand the mechanisms by which cartilage damage proceeds and to investigate novel treatment strategies to alleviate or prevent the progression of PTOA. This protocol describes an open, drop tower-based rabbit femoral condyle impact model to induce cartilage damage. This model delivered peak loads of 579.1 &plusmn; 71.1 N, and peak stresses of 81.9 &plusmn; 10.1 MPa with a time-to-peak load of 2.4 &plusmn; 0.5 ms. Articular cartilage from impacted medial femoral condyles (MFCs) had higher rates of apoptotic cells (p = 0.0058) and possessed higher Osteoarthritis Research Society International (OARSI) scores of 3.38 &plusmn; 1.43 compared to the non-impacted contralateral MFCs (0.56 &plusmn; 0.42), and other cartilage surfaces of the impacted knee (p &lt; 0.0001). No differences in OARSI scores were detected among the non-impacted articular surfaces (p &gt; 0.05).

The open medial femoral condyle impact model in rabbits is reliable for studying post-traumatic osteoarthritis (PTOA) and novel therapeutic strategies to mitigate PTOA progression. This protocol generates an isolated cartilage defect of the posterior medial femoral condyle in rabbits using a carriage-based drop tower with an impactor head.

Post-traumatic osteoarthritis (PTOA) is responsible for 12% of all osteoarthritis cases in the United States. PTOA can be initiated by a single traumatic ...

Therapeutic Potential of Tuina Massage for Knee Osteoarthritis

Tuina Intervention in Sodium Monoiodoacetate Injection-Induced Rat Model of Knee Osteoarthritis

Knee osteoarthritis (KOA), a common degenerative joint disorder, is characterized by chronic pain and disability, which can progress to irreparable structural damage of the joint. Investigations into the link between articular cartilage, muscles, synovium, and other tissues surrounding the knee joint in KOA are of great importance. Currently, managing KOA includes lifestyle modifications, exercise, medication, and surgical interventions; however, the elucidation of the intricate mechanisms underlying KOA-related pain is still lacking. Consequently, KOA pain remains a key clinical challenge and a therapeutic priority. Tuina has been found to have a regulatory effect on the motor, immune, and endocrine systems, prompting the exploration of whether Tuina could alleviate KOA symptoms, caused by the upregulation of inflammatory factors, and further, if the inflammatory factors in skeletal muscle can augment the progression of KOA.
We randomized 32 male Sprague Dawley (SD) rats (180-220 g) into four groups of eight animals each: antiPD-L1+Tuina (group A), model (group B), Tuina (group C), and sham surgery (group D). For groups A, B, and C, we injected 25 &#181;L of sodium monoiodoacetate (MIA) solution (4 mg MIA diluted in 25 &#181;L of sterile saline solution) into the right knee joint cavity, and for group D, the same amount of sterile physiological saline was injected. All the groups were evaluated using the least to most stressful tests (paw mechanical withdrawal threshold, paw withdrawal thermal latency, swelling of the right knee joint, Lequesne MG score, skin temperature) before injection and 2, 9, and 16 days after injection.

Author Spotlight: Treating Knee Osteoarthritis with Tuina - A New Perspective 

This protocol describes the methods of Tuina intervention in sodium monoiodoacetate injection-induced rat model of knee osteoarthritis (KOA), which provides a reference for the application of Tuina in KOA animal models. This protocol also studies the effective mechanism of Tuina for KOA, and the results will help promote its application.

Knee osteoarthritis (KOA), a common degenerative joint disorder, is characterized by chronic pain and disability, which can progress to irreparable ...

Training Prior to Executing Tuina on Knee Osteoarthritis Rabbit Model

Initiate training using the Tuina Technique Parameter Determination Tool prior to executing the Tuina manipulation. To do so, on the Tuina Manipulation Simulation Platform, perform the rotary kneading and pressing method using the thumb. At the same time, in the Tuina Manipulation Parameter Processing Software observe the magnitude, frequency, and duration of action of the applied force across the x, y, and z-axes.Standardize the training in an applied force of five newtons and a frequency of 60 times per minute. Maintain the standardized rotary kneading and pressing continuously for an operation time of 10 minutes.