Iliotibial band syndrome (ITBS) is
the result of inflammation and irritation of the distal portion of the
iliotibial tendon as it rubs against the lateral femoral condyle, or
less commonly, the greater tuberosity. This
occurs with repetitive flexion and extension of the knee. Inflammation
and irritation of the iliotibial band (ITB) also may occur because of a
lack of flexibility of the ITB, which can result in an increase in
tension on the ITB during the stance phase of running. See the image
below.
In
this 27-year-old female marathon runner with anterolateral pain
superior to the joint line, a coronal fast spin-echo T2-weighted
magnetic resonance imaging scan with fat suppression demonstrates edema
between the iliotibial band and the lateral femoral condyle (arrow). The
edema's location is consistent with a clinical diagnosis of iliotibial
band syndrome. Other causes or factors that are believed to
predispose an athlete to ITBS include excessive internal tibial
rotation, genu varum, and increased pronation of the foot.
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