Click to Play The Acute Patella Injury Test (aka Apprehension Test) is used to assess the possibility that the patient may have sustained a patellar dislocation which spontaneously reduced.  This test provokes the same sensations which would have been present when the dislocation occured and therefore will elicit a reactive contraction of the quadriceps muscles by the patient in an attempt to avoid a recurrance of the dislocation.  This reaction is referred to as an apprehension sign.  The patient lies supine on the table with the knee in 20-30 degrees of flexion and the quadriceps relaxed.  The examiner carefully glides the patella laterally observing for the apprehension sign.  A positive test is the presence of this reaction by the patient.

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