1. Arthroscopic Treatment of Popliteal Cyst: A Direct Posterior Portal by Inside-Out Technique for Intracystic Debridement 
Pinkawas Kongmalai, M.D., Bancha Chernchujit, M.D. 
Arthroscopy Techniques 
Volume 4, Issue 2, Pages e143-e148 (April 2015)
DOI: /j.eats
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

2. Fig 1
Aspiration of popliteal cyst fluid from left knee with 18-gauge needle.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
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3. Fig 2
The dye (methylene blue) is injected through the skin into the cyst.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
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4. Fig 3
Arthroscopic findings from the anterolateral portal in the left knee show the entry point for the arthroscope to the posteromedial compartment between the medial femoral condyle and posterior cruciate ligament.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

5. Fig 4
Arthroscopic findings from the anterolateral portal in the left knee show the capsular fold located on the posteromedial side of the medial head of the gastrocnemius tendon. (The dotted lines represent the border of the capsular fold.)
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

6. Fig 5
Arthroscopic findings from the anterolateral portal in the left knee show partial resection of the posteromedial fold with a basket forceps through the posteromedial portal.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
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7. Fig 6
Arthroscopic findings from the anterolateral portal in the left knee show the fibrous membrane, nodules, and septa within the popliteal cyst, which may be factors associated with a postoperative recurrence after arthroscopic cystectomy.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
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8. Fig 7
Transillumination technique to avoid injury to popliteal vessels. The arrow indicates that the arthroscopic camera is within the cyst and close to the skin.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

9. Fig 8
Inside-out technique to create direct posterior portal. One should note that the position of the direct posterior portal (white arrow) is separated from the posteromedial portal (black arrow).
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

10. Fig 9
Introduction of motorized shaver through direct posterior portal (arrow). The inset shows the motorized shaver through this portal, which facilitates intracystic debridement.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

11. Fig 10 Flowchart for arthroscopic treatment of popliteal cyst.
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions

12. Fig 11
An axial-view magnetic resonance imaging scan of the left knee shows that the neurovascular structures are being pushed laterally by the popliteal cyst. The gray tube and blue arrow show the direction of the arthroscopic sheath and the Wissinger rod, which are distant from the neurovascular structures (red area).
Arthroscopy Techniques 2015 4, e143-e148DOI: ( /j.eats )
Copyright © 2015 Arthroscopy Association of North America Terms and Conditions