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Related Concept Videos

Structural Joints: Synovial Joints01:16

Structural Joints: Synovial Joints

Synovial joints are the most common type of joint in the body. A key structural characteristic for a synovial joint is the presence of a joint cavity. This fluid-filled space is where the articulating surfaces of the bones contact each other. Also, unlike fibrous or cartilaginous joints, the articulating bone surfaces at a synovial joint are not directly connected to each other with fibrous connective tissue or cartilage. This gives the bones of a synovial joint the ability to move smoothly...
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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...

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Updated: Jun 4, 2026

Synovial Fluid Analysis to Identify Osteoarthritis
07:51

Synovial Fluid Analysis to Identify Osteoarthritis

Published on: October 20, 2022

Synovial fluid analysis for crystals.

Eliseo Pascual1, Francisca Sivera, Mariano Andrés

  • 1Rheumatology Section, Hospital General Universitario de Alicante, Spain. pascual_eli@gva.es

Current Opinion in Rheumatology
|February 3, 2011
PubMed
Summary

Diagnosing gout and CPPD arthritis relies on identifying monosodium urate (MSU) and calcium pyrophosphate dehydrate (CPPD) crystals. This review emphasizes synovial fluid analysis as the gold standard, advocating for its wider adoption and improved technique among clinicians.

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Area of Science:

  • Rheumatology
  • Crystal Arthropathies
  • Diagnostic Techniques

Background:

  • Gout and CPPD arthritis are often misdiagnosed clinically.
  • Monosodium urate (MSU) and calcium pyrophosphate dehydrate (CPPD) crystal identification is the gold standard for diagnosis.
  • Crystal identification techniques require critical review and clinician attention.

Purpose of the Study:

  • To review the timely and relevant technique of crystal identification in synovial fluid.
  • To address reasons that may deter clinicians from performing crystal analysis.
  • To promote the adoption and perfection of synovial fluid analysis for diagnosing gout and CPPD arthritis.

Main Methods:

  • Review of literature on crystal identification in synovial fluid.
  • Illustration of crystal analysis using ordinary light and polarized microscopy.
  • Emphasis on the simplicity and immediacy of synovial fluid analysis.

Main Results:

  • Synovial fluid analysis provides immediate and definitive diagnosis of gout and CPPD arthritis.
  • Properly equipped clinics and trained rheumatologists can effectively perform crystal identification.
  • Both ordinary light and simple polarized microscopes can yield good results for crystal analysis.

Conclusions:

  • Synovial fluid analysis is a simple, effective diagnostic method for gout and CPPD arthritis.
  • Clinicians are encouraged to acquire or improve their skills in synovial fluid analysis.
  • Use of a compensated polarized microscope is recommended to meet current diagnostic standards.