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Intra-articular rheumatoid nodules and triggering of the knee joint.
  1. Z Diamant,
  2. F J Hooning van Duyvenbode,
  3. F Eulderink,
  4. M Janssen,
  5. Z Tak-Diamant
  1. Department of Rheumatology, University Hospital Leiden, The Netherlands.


    Rheumatoid nodules are a common extra-articular manifestation in rheumatoid arthritis. Intra-articular localisation of these nodules is rare and may produce clinical symptoms. Seven patients with walking problems due to an intra-articular rheumatoid nodule, which became entrapped on the ridge of the tibial plateau of the knee joint resulting in a phenomenon referred to as trigger knee, are described. After excision of the nodules all symptoms completely disappeared.

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