Endoscopic Loose Body Removal From Zone 2 Flexor Hallucis Longus Tendon Sheath  Tun Hing Lui, M.B.B.S.(HK), F.R.C.S.(Edin), F.H.K.A.M., F.H.K.C.O.S.  Arthroscopy Techniques  Volume 5, Issue 3, Pages e465-e469 (June 2016) DOI: 10.1016/j.eats.2016.01.026 Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 1 Sagittal views on magnetic resonance imaging of the right ankle in the illustrated case. (A) Loose bodies (arrowhead) at the zone 1 flexor hallucis longus posterior to the ankle. (B) Loose bodies (arrowhead) at the zone 2 flexor hallucis longus tendon sheath. Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 2 Zone 2 tendoscopy of the right foot with the patient in the prone position. (A) The posteromedial portal is the viewing portal. A Wissinger rod is passed through the posteromedial portal, under the sustentaculum, to the plantar portal. (B) An arthroscopic view shows that the rod passes through the fibro-osseous orifice at the posterior talar tubercle. (FHL, flexor hallucis longus tendon.) Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 3 Zone 2 tendoscopy of the right foot with the patient in the prone position. The posteromedial portal is the viewing portal. A loose body (LB) is trapped by the interconnection tendon (IT) at the master knot of Henry. Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 4 Zone 2 tendoscopy of the right foot with the patient in the prone position. (A) The posteromedial portal is the viewing portal. An arthroscopic shaver is inserted through the plantar portal. (B) Inflamed synovium (IS) of the zone 2A tendon sheath (TS) is resected. (FHL, flexor hallucis longus tendon.) Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 5 Zone 2 tendoscopy of the right foot with the patient in the prone position. The posteromedial portal is the viewing portal. A loose body (LB) is removed from the zone 2 tendon sheath by a grasper. (FHL, flexor hallucis longus tendon.) Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions

Fig 6 Zone 1 flexor hallucis longus tendoscopy of the right foot with the patient in the prone position. A loose body is pushed to the retrocalcaneal space, and the shaver is left in situ. The loose body is then removed through zone 1 flexor hallucis longus tendoscopy. Arthroscopy Techniques 2016 5, e465-e469DOI: (10.1016/j.eats.2016.01.026) Copyright © 2016 Arthroscopy Association of North America Terms and Conditions