1. Compression and Flip Test for Diagnosis of Unstable Acetabular Labral Tears Using a Peripheral Compartment Approach 
Adinun Apivatgaroon, M.D., Michael Dienst, M.D. 
Arthroscopy Techniques 
Volume 5, Issue 6, Pages e1433-e1439 (December 2016)
DOI: /j.eats
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

2. Fig 1
Compression and flip test of the anterior labrum of the right hip with an arthroscope inserted through the proximal anterolateral portal (PALP) and a hook via the anterior portal (AP).
Modified with permission from Dienst M, ed., Hip Arthroscopy, Elsevier Urban & Fischer, Munich 2010.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

3. Fig 2
Normal and pathologic conditions (red arrow) of the anterolateral labrum during inspection of the right hip from the proximal anterolateral viewing portal with a 70° arthroscope. (A) Normal labrum; (B) labral hypertrophy; (C) discoloration of the labral base; (D) increased vascular blood filling; (E) labral ossification; (F) labral cyst; (G) cartilage flap interpositioning between the labrum and femoral head (FH). © 2016 Michael Dienst. All Rights Reserved.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

4. Fig 3
Negative compression and flip test of the anterolateral labrum (red arrow) of a right hip from the proximal anterolateral viewing portal using a 70° arthroscope with normal firm and elastic resistance before (A, B) and during compression (C, D). (FH, femoral head.) © 2016 Michael Dienst. All Rights Reserved.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

5. Fig 4
Grade 1+ positive compression and flip test of the anterolateral labrum (red arrow) of a right hip from the proximal anterolateral viewing portal using a 70° arthroscope before (A, B) and after compression with the probe with a deep indentation at the base of the labrum (C, D). In this area, the labrum shows red discoloration. (FH, femoral head.) © 2016 Michael Dienst. All Rights Reserved.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

6. Fig 5
Grade 2+ positive compression and flip test of the anterolateral labrum (red arrow) of a right hip from the proximal anterolateral viewing portal using a 70° arthroscope before (A, B) and after compression (C, D). With eversion of the labrum, the free edge is raised (large black arrows) and the labral margin of the tear (small black arrows) can be seen. (FH, femoral head.) © 2016 Michael Dienst. All Rights Reserved.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

7. Fig 6
Grade 1– compression and flip test of the anterolateral labrum of a right hip from the proximal anterolateral viewing portal using a 70° arthroscope. The subtotal, ossified labrum (red arrow) (A), before (B), and after (C) compression. (FH, femoral head.) © 2016 Michael Dienst. All Rights Reserved.
Arthroscopy Techniques 2016 5, e1433-e1439DOI: ( /j.eats )
Copyright © 2016 Arthroscopy Association of North America Terms and Conditions