Moving Patellar Apprehension Test for Patellar Dislocation Patellar dislocation can have several underlying anatomical factors including but not limited to abnormal bony anatomy of the trochlea and patella, mechanical misalignment of the lower limb as well as static and dynamic deficiency of soft tissue stabilizers. The traditional patellar apprehension test as well as CTs or MRI may fail to detect patients with patellar instability due to its static nature – especially outside of an acute event