الفهرس 
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Abstract
Sports-related knee injuries are common, with contact sports and sports involving twisting movements being the most frequent causes, and may affect any of the knee structures, including ligaments, menisci, bones, cartilage and periarticular soft tissues (Lim and Wilfred, 2008).
Conventional radiology remains the primary imaging modality for children with knee pain, but many serious injuries will not be shown. In particular, most soft tissue abnormalities; therefore, the value of radiography is often limited (Sanchez et al., 2009).
MR imaging is an excellent modality for pediatric knee disorders, because it is painless, non-invasive and does not involve ionizing radiation, and it is important, following trauma, in diagnosing fractures, ligamentous injuries, meniscal damage and cartilage injury (Bache et al., 2008).
The reported accuracy of MR imaging of the knee for meniscal tears is 90%– 95%; for the cruciate ligaments, the accuracy is 95%–100%. This high accuracy has resulted in MR imaging being preferred to diagnostic arthroscopy by most orthopedic surgeons (Helms et al., 2002).
Although MRI resolves bone mineral poorly, it is the ideal modality whenever a detailed characterization of bone marrow disorder is sought. This gives MRI a special place in evaluating osteochondral injury, osteonecrosis, bone bruising, bone stress, and transient osteoporosis of the joint (Orchard et al., 2005).
Another area in which MR imaging is playing a vital role in athletes is imaging of hyaline articular cartilage. Newer surgical techniques rely heavily on MR imaging for help in identification and classification of cartilage abnormality (Helms et al., 2002).
For better results a mechanism based approach to the injury patterns, using both clinical and MR imaging findings, can be used (Lim and Wilfred, 2008).
In spite of the value of MRI in diagnosis of knee sport injury, the cost effect of MRI is still a challenge in using it as routine test (Sanchez et al., 2009).