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Vol. 17. Núm. 10.
Páginas 622-623 (Diciembre 2021)
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Vol. 17. Núm. 10.
Páginas 622-623 (Diciembre 2021)
Images in Clinical Rheumatology
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Synovial osteochondromatosis of the knee
Osteocondromatosis sinovial de la rodilla
Sreoshy Sahaa, Latika Guptab,
Autor para correspondencia

Corresponding author.
a Mymensingh Medical College, Mymensingh, Bangladesh
b Department of Clinical Immunology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, C block, Rai Bareilley Road, 226014 Lucknow, India
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A 55-year-old lady presented in the outpatient clinic, with the complaints of mechanical knee pain of three-year duration. Radiographs (Fig. 1) of the knee were suggestive of multiple loose radio-opaque calcified bodies around the knee joint.

Fig. 1.

Anteroposterior and lateral radiographs of knee. Multiple loose calcified bodies are seen within it (asterisks).


The radiographs are pathognomonic of Synovial Osteochondromatosis, an atypical neoplastic disease, with an occurrence rate of 1 in 100,000 people.1 People are likely to get affected by Synovial Osteochondromatosis in their 3rd to 5th decades of life, occurs almost 2 times more frequently in men than women. The pathogenesis includes hyperplastic metaplasia of connective tissue where hyaline cartilage gets calcified into multiple intra-articular loose bodies in synovial tissues, within the joint, bursa or tendon sheaths. Though knee is mostly affected, hip, shoulder, ankle, elbow, and wrist joints can also be affected. Joint swelling and tenderness, locking, pain, restrictions of range of motion in affected joints are some common clinical features. This disease has potential to transform into chondrosarcoma, in very few cases.2 Surgical excision of the chondromal nodules and synovectomy are the mainstay of treatment to prevent late degenerative transformation. Overall with a reported recurrence of 3–60% in primary disease, the recurrence rate goes below 10% after surgery.1,2

Ethics approval and consent to participate

Participant provided informed consent for the photographs included in this paper.

Availability and data sharing

The data used during the current study is available from the corresponding author on reasonable request.

Consent for publication

Consent for publication of pictures was given by the participant.


The authors have nothing to disclose.


All authors were involved in manuscript ideation and preparation.


This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Conflict of interest



The authors thank Connecting Researchers and Dr Mallke Asaad for their help with this work.

J.F. Díaz Fernández, R.A. Peraza Mc Liberty.
Synovial osteochondromatosis of the shoulder: case report and literature review.
Reumatol Clin, 14 (2018), pp. 56-58
M. Khodaee, J. Seyfert.
Not a typical case of bilateral knee osteoarthritis.
Copyright © 2021. Elsevier España, S.L.U. and Sociedad Española de Reumatología y Colegio Mexicano de Reumatología
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