Gout and coexisting pseudogout in the knee joint

Abstract

Purpose

We report the unusual case of a 63-year-old man with gout and coexisting pseudogout (calcium pyrophosphate dihydrate crystal deposition disease) affecting the same joint. In this report, we describe the clinical features of the patient in addition to the characteristics of the crystals extracted from his affected joint, examined using compensated polarized microscopy.

Methods

Synovial fluid and specimens of the lateral meniscus of the patient’s knee joint taken during arthroscopy were analyzed using compensated polarized microscopy to evaluate the presence and type of crystals.

Results

Compensated polarized microscopy revealed both monosodium urate (MSU) and calcium pyrophosphate dihydrate (CPPD) crystals extracted from the knee joint.

Conclusions

Our findings suggest that the coexistence of gout and pseudogout should be considered in the diagnosis of crystal-induced arthritis. Careful crystal evaluation using compensated polarized microscopy may reveal similar cases with MSU and CPPD crystals in the same joint.

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Conflict of interest

There are no conflicts of interest to disclose for this study.

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Correspondence to Young-Jin Seo.

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Yoo, Y., Seo, Y., Huh, M. et al. Gout and coexisting pseudogout in the knee joint. Knee Surg Sports Traumatol Arthrosc 19, 553–555 (2011). https://doi.org/10.1007/s00167-010-1236-8

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Keywords

  • Knee
  • Pseudogout
  • Gout
  • Arthroscopy