The diagnosis of OCD may be suggested by the history and physical examination. X-rays of the ankle will usually show a problem on the top of the talus (sometimes called the talar dome). The terms lesion and fracture have often been used interchangeably to describe osteochondral defects (OCDs). They require a strong plan. When a small defect in the chondral plate is present, the intraarticular fluid will erode the subchondral bone, which will result in bone marrow edema. Open mosaicplasty in osteochondral lesions of the talus: a prospective study. This condition is also known as osteochondritis dissecans (OCD) of the talus or a talar osteochondral lesion (OCL). Lesion size, location, chronicity, and characteristics such as displacement and the presence of subchondral cysts help dictate the appropriate treatment required to achieve a satisfactory result. Foot Ankle Surg 2012;51:556-60. • Goh GSH et al. The classic and most common location of OCD in the knee is the lateral (intercondylar) aspect of the medial femoral condyle (52,53) , followed by the extended classic (also involving the central weight-bearing area) and inferocentral (weight-bearing) locations and lateral condylar and patellar lesions. Characterizing osteochondral lesions by magnetic resonance imaging. Arthroscopy. Twenty-one joints with stable (n = 9) or loose (n = 12) osteochondritis dissecans (OCD) lesions were examined in 15 subjects with plain radiography, three-phase bone scintigraphy, and magnetic resonance (MR) imaging. ducepain, but unstable lesions with breaches in the overlying cartilage or with frank detachment of the lesion can produce more severe symptoms, which include decreased range of motion, crepitus, and mechanical locking, and can increase the risk for premature osteoarthritis [4]. Figure 14a. 1991;7:101– 104. • Emre et al. There are three possible explanations for the underreporting of this lesion in the radiology … The talar dome is the third most common location for OCD lesions … Finally, when fluid flows underneath the defect, the OCD can become unstable and may result in a corpus liberum. Osteochondral lesions of the talus (OLTs) are a difficult pathologic entity to treat. OCD lesions account for about 1% of all talar fractures. Purpose: The purpose of our study was to investigate the performance of MRI findings to predict instability of osteochondral lesion of the talus (OLT) in children and the association between skeletal maturity and lesion stability. Materials and method: This retrospective IRB-approved and HIPPA-compliant study included … Unstable OCD lesion … Special tests such as a computerized tomography (CT) or a magnetic resonance imaging (MRI) scan may be necessary to determine the full … A patient with an unstable, displaced OCD of the talus typically presents with mechanical symptoms, including locking or giving way of the ankle because of the loose body. The lesion size and the thickness of the sclerotic margin as measured on plain radiographs were good … In adults, the MR imaging criteria of a high-signal-intensity rim surrounding an OCD lesion on T2-weighted images, cysts surrounding an OCD lesion, a high T2 signal intensity fracture line extending through the articular cartilage overlying an OCD lesion, and a fluid-filled osteochondral defect have high sensitivity and specificity … The most commonly used system for classifying OCD lesions was presented by Berndt and Harty in 1959, with additional staging described by … Stable OCDs may … An osteochondral lesion of the talus (OLT) is an area of abnormal, damaged cartilage and bone on the top of the talus bone (the lower bone of the ankle joint). The prevalence of osteochondritis dissecans in the tibial plafond detected on radiography is unknown. Such lesions have poor prognoses with nonoperative treatment and typically are addressed with arthroscopic surgery. 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