posterior sag test

pos·ter·i·or sag test

(pos-tēr'ē-ŏr sag test)
Maneuver used to determine integrity of posterior cruciate ligament whereby the patient is in a supine position with the hips flexed at 45 degrees and knees flexed at 90 degrees. When viewed laterally, a loss of the tibial tubercle prominence is present in a posterior cruciate deficient knee when the tibia falls back or sags on the femur.
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The posterior sag test is performed with the ipsilateral hip and knee both flexed to 90[degrees].
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