Health

What is the significance of the bone marrow edema pattern in the proximal femur? Bone marrow edema, manifested on MRI as hypointensity on T1-weighted images and hyperintensity on fluid-sensitive images, is a nonspecific finding observed in a variety of disease entities, including osteonecrosis, idiopathic transient osteoporosis of the hip (ITOH), transient bone marrow edema syndrome, …

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What is the proper MRI technique used for the evaluation of hip pain? The exact MR imaging sequence combination depends on the scanner, clinical indication, patient factors, and radiologists’ preferences. In the setting of trauma, the entire pelvis and both hips should be included in at least one (coronal and/or axial) plane. For evaluating joint …

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What are the indications for magnetic resonance imaging (MRI) of the hip? Hip MRI is the examination of choice when radiography fails to reveal the cause of hip pain, either traumatic or nontraumatic. Following trauma, some of the common causes of hip pain in patients with normal radiographs are occult proximal femoral (for example, neck …

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What is the basic normal anatomy of the hip? The hip is a ball-and-socket joint formed by the femoral head and the acetabulum, providing a large range of multidirectional motion. The acetabulum is tilted anteriorly, allowing a greater degree of flexion than extension. It covers 40% of the femoral head, and its depth is increased …

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What is gamekeepers thumb? This refers to a tear of the UCL of the metacarpophalangeal joint of the thumb. Although originally described in gamekeepers on large estates in the United Kingdom who would stress this joint by the repeated use of cervical dislocation to kill small animals, it is more commonly caused in this era …

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What is a Stener lesion? The major associated complication of UCL tear is the Stener lesion, in which the torn UCL is proximally retracted, and lies in a location superficial to the adductor pollicis aponeurosis. In this location, the UCL cannot heal and reattach to the proximal phalanx. The retracted UCL appears on MRI as …

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What is a fibrolipomatous hamartoma (FLH)? FLH is a benign overgrowth of the nerve consisting of fatty and fibrous tissue. The median nerve in the carpal tunnel is the most common site of such a lesion. It is seen on MRI as fatty infiltration and enlargement of the nerve surrounding lower signal intensity nerve fascicles, …

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