The impingement test is performed by placing the patient in the supine position with the hip in 90° flexion and then adducting and internally rotating the hip.
Anterior impingement test
The anterior impingement test is a sensitive test to reveal intra-articular pathology in particular a torn anterior superior acetabular labrum.
With the patient supine,the hip is flexed to 90°,then adducted and internally rotated.A positive test reproduces the patients pain in the hip or groin.A positive test may sometimes be accompanied by a crepitus,clicking or a popping sesation.
The test compresses the anterior surface of the labrum
Posterior Impingement test
The posterior impingement test is helpful in demonstrating any disease between the posterior acetabular wall and femoral neck.
The patient lies supine at the edge of the examination couch with the affected leg dangling.The contralateral leg is held in flexion while the examiner fully extends the affected hip while abducting and externally rotating the leg
nerve by the piriformis muscle
The FABER test is used to distinguish between pain arising from the sacro-iliac joint and pain arising from the posterior aspect of the hip.It is also a test for posterior impingement.
The patient lies supine,placing the ipsilateral foot on the contralateral knee.This is the so called figure of 4 position.The ipselateral leg is allowed to relax and the leg will be is seen to drop outwards to a variable degree.When this endpoint has been reached,the examiner places one hand on the flexed knee and the other on the ASIS of the contralateral sie and presses gently downwards of the flexed knee.
Increased pain can be elicited but with different localisation for the SIJ and posterior hip
The FABER distance is measured as the vertical distance between the knee and the examination table.