Surgical Procedure
1. Overview of posterior compartment after the standard approach for posterior ankle arthroscopy.
2. Release of flexor retinaculum with punch.
3. Release of talocalcaneal ligament with arthroscopic punch.
4. Overview of structures lateral to the os trigonum.
5. Release of posterior talofibular ligament with punch.
6. Overview of posterior compartment after release of flexor retinaculum, talocalcaneal ligament and posterior talofibular ligament.
7. Exploration of os trigonum and its attachment to the talus with a probe.
8. Release of os trigonum with periosteal elevator from inferior.
9. Release of os trigonum from the superior side.
10. Removal of os trigonum with grasper.
11. End-result