• Vol. 48 No. 5
  • 15 May 2019

A Rare Case of Concomitant Intra-Articular and Extra- Articular Synovial Chondromatosis of the Knee Joint

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Synovial chondromatosis is an uncommon metaplastic
disease in which foci of ectopic cartilage develop from the
synovium.1 Despite the known benign nature of this disease,
loose bodies can occur when these osteo-cartilaginous
lesions grow and detach from the synovium. This may result
in disabling mechanical symptoms as well as accelerated
degeneration of the affected joint due to irritation and wear.
The symptoms can otherwise be non-specific, with patients
complaining of pain, swelling or limitation of motion.
It is known that synovial chondromatosis occurs more
frequently in men, with increasing frequency during the
third to fifth decades of life.2 The disease most commonly
affects the knee joint, with the typical location being intraarticular.
3,4 Extra-articular involvement of the bursae and
tenosynovium is less common.5 Combined intra- and extraarticular
involvement of the knee joint is very rare with
limited reports in the existing literature.4,6,7 We describe a
case of a patient who presented with coexisting intra- and
extra-articular synovial chondromatosis of the knee joint
and highlight the importance of adequate imaging prior to
surgical treatment.

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