1. Intra-articular Fluid Distension for Initial Portal Placement During Hip Arthroscopy: The “Femoral Head Drop” Technique 
Kyle Alpaugh, M.A., Sangmin R. Shin, M.D., Scott D. Martin, M.D. 
Arthroscopy Techniques 
Volume 4, Issue 1, Pages e23-e27 (February 2015)
DOI: /j.eats
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

2. Fig 1
Flowchart for performing intra-articular fluid distension. (AP, anteroposterior; ASIS, anterior superior iliac spine.)
Arthroscopy Techniques 2015 4, e23-e27DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

3. Fig 2
(A) Radiolucent vacuum sign (arrow) after minimal traction and before distension. (B) After venting. (C) After distension.
Arthroscopy Techniques 2015 4, e23-e27DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions