90-90 straight leg raising test
90-90 straight leg raising testA clinical test used to identify hamstring muscle tightness.
The patient lies supine with the hips and knees flexed to 90º and grasps behind both of his or her thighs to stabilise the hip joints, then actively extends each knee in turn.
Inability to extend the knee to within 20º of full knee extension implies hamstring muscle tightness.
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