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Gout and coexisting pseudogout in the knee joint
Yonsik Yoo1, Young-Jin Seo, Mina Huh
1Center for Arthroscopy, Department of Orthopaedic Surgery, Hallym University Hangang Sacred Heart Hospital, 94-200 Youngdeungpo-Dong, Youngdeungpo-Ku, 150-719, Seoul, Korea.
Summary
This case study found both gout (monosodium urate crystals) and pseudogout (calcium pyrophosphate dihydrate crystals) in the same knee joint. Compensated polarized microscopy is key for diagnosing crystal-induced arthritis.
Area of Science:
- Rheumatology
- Crystallography
- Orthopedics
Background:
- Gout and pseudogout are common crystal-induced arthropathies.
- Typically, these conditions affect different joints or occur independently.
Observation:
- A 63-year-old male presented with simultaneous gout and pseudogout in the same knee joint.
- Clinical features and synovial fluid analysis were performed.
Findings:
- Compensated polarized microscopy confirmed the presence of both monosodium urate (MSU) and calcium pyrophosphate dihydrate (CPPD) crystals in the affected knee joint.
- This is an unusual presentation of crystal deposition disease.
Implications:
- The coexistence of gout and pseudogout should be considered in diagnosing crystal-induced arthritis.
- Utilizing compensated polarized microscopy is crucial for identifying mixed crystal depositions in joints.
- This case highlights the importance of thorough crystal analysis for accurate diagnosis and management.
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