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According to Van Breuseghem et al. [3], a locking sensation is usually not experienced as expected with a free intra-articular body, but this is not always true, as our patient had intermittent locking, and the two patients reported by Schnarkowski et al. [8] also had locking.
For the first time, non-closure of cervical vertebral foramina transversaria and loose intra-articular bodies have been recorded in mammoths.
Pain, swelling, and restricted range of motion are supposed to be the primary symptoms; crepitus, popping, or even catching caused by intra-articular bodies are not uncommon (Trias and Quintana 1976, Roulot and Le Viet 1999, Butt et al. 2005).
O steochondritis dissecans (OCD) is used to refer to presentations where osteochondral fragments separate and become loose intra-articular bodies (joint mice), leading to further damage such as synovitis and pain accompanied by varying degrees of lameness [ 2].
It may progress over several years until the osteochondral fragments are detected on radiological imaging as radiopaque intra-articular bodies (Shpitzer et al. 1990, Knoeller 2001, Chen et al. 2003) that may be associated with bony erosions (Goldberg et al. 1983, Knoeller 2001, Kim et al. 2002, Lim et al. 2006, Murphey et al. 2007).
The differential diagnosis includes iliotibial-band friction syndrome [6], discoid lateral meniscus [7], intra-articular loose body, synovial plicae [8], congenital snapping knee [9], and patellar dysplasia [10].
Clinical Relevance: An anchor which fails principally by pull out at a low load to failure is at risk for creating an intra-articular loose body.
Open image in new window Fig. 14 Axial oblique fat-saturated T1-weighted arthro-MR image shows a hypointense structure wholly surrounded by contrast medium consistent with an intra-articular foreign body (white arrow. Abnormality of the ligamentum teres (ligament of the head of the femur) is rare.
MR and MDCT arthrography allow for the differentiation of intra-articular foreign bodies from osteophytes, synovial folds or hypertrophic synovitis: classically, intra-articular foreign bodies are surrounded by contrast medium, but only partially in the case of osteophytes and synovial folds (Fig. 14) [74].
The prevalence of intra-articular foreign bodies of the hip is low.
Although standard radiographs can show radiopaque calcifications and intra-articular loose bodies, MRI is the imaging technique of choice in the accurate assessment of synovial osteochondromatosis.
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