The impending separation of the osteochondral fragment is in keeping of grade III lesion. The etymology of the term osteochondritis dissecans is worthy of discussion. 180, no. Check for errors and try again. The dGEMRIC imaging technique, which displays the distribution of negatively charged gadolinium-based MRI contrast material (gadopentetate dimeglumine) within cartilage, has been validated as an accurate marker of cartilage tissue glycosaminoglycan (GAG) concentration. Symptoms include joint pain, stiffness, and even locking of the joint. Osteochondritis dissecans was originally described in 1888 as a process of loose body formation associated with articular cartilage and subchondral bone fracture in the hip and knee. Prevalence of this condition ranges between 15 and 29 per 100,000, with an increased male predominance of 2:1. Some investigators have also recommended using direct MR arthrography for evaluating patients with OCD, looking for signs of instability and differentiation of partial versus complete separation of fragments indicated by contrast subsiding the OCD fragment ( Fig. Multiple studies have described the MRI findings in patients with stable and unstable OCD lesions. In a study of 32 skeletally immature patients using arthroscopy as the reference standard, Kijowski and colleagues found that the presence of T2 signal intensity rim or cysts surrounding an OCD lesion may be a sign of instability only in adults. The De Smet criteria initially revealed a sensitivity and specificity of 92% and 90% respectively for differentiating unstable lesions from stable lesions. It should also provide valuable information about articular cartilage repair tissue after surgery. Comparison of combined 3D GRE and routine MRI and arthroscopic results in staging of osteochondritis dissecans lesions for reader 2. Osteochondritis dissecans (OCD or OD) is a joint disorder primarily of the subchondral bone in which cracks form in the articular cartilage and the underlying subchondral bone. For example, OCD involving the trochlear sulcus is best evaluated on axial and sagittal images. Direct MR arthrography also provides advantages of distention, increased intra-articular pressure from the fluid volume, and increased signal/noise ratio on T1-weighted imaging. As such, conventional CT is limited in providing diagnostic information regarding OCD lesion stability or healing potential. Osteochondritis dissecans has been shown to heal with protective weight bearing alone, if there is no loose body in the joint. Emerging MRI sequences have shown great potential for the physiologic assessment of cartilage repair tissue. The MRI-based staging system corresponded well with the ICRS classification, providing an accurate preoperative assessment of OCD lesions of the elbow, even with minimal subchondral bone information. The role of the different imaging modalities has evolved with time. Osteochondritis dissecans of the talar articular surface of the ankle joint has been well described. (, A 21-year-old man with an unstable adult OCD lesion of the lateral femoral condyle. Fluid-sensitive (T2) sequences should be obtained in all 3 standard planes. Characteristic radiographic findings include a well-circumscribed area of subchondral bone separated by a crescent-shaped radiolucent outline of the fragment. Quantitative T2 mapping has been correlated with type II collagen matrix organization within normal hyaline articular cartilage. Hereditary, traumatic, and vascular causes have been proposed, with conflicting evidence supporting each. 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