“Intersection syndrome” of the foot: treated by endoscopic release of master knot of Henry

Abstract

Intersection syndrome of the forearm is a painful condition in the area where the muscle bellies of the abductor pollicis longus and extensor pollicis brevis cross the common wrist extensors. A similar case of the foot with marked fibrosis at the interconnection of flexor hallucis longus and flexor digitorum tendons is reported and the fibrous interconnection was extended proximally. This was successfully treated with endoscopic release of the master knot of Henry.

Foot and ankle tendoscopies: current concepts review

“…33 Endoscopic synovectomies for flexor digitorum longus tenosynovitis have been reported with resolution of symptoms. 34 Tendoscopy around the foot and ankle has also been used for tendon grafting assistance. Tendoscopic harvesting of the anterior tibial and flexor digitorum longus tendons has been used to reinforce posterior tibialis tendon in adult symptomatic flatfoot deformity.…”

Ultrasound-Guided Interventions in the Midfoot and Forefoot

“…The flexor hallucis longus tendon can also become irritated as it crosses with the flexor digitorum longus tendon, at an anatomical landmark called the knot of Henry. 15 On US, the knot of Henry can most easily be identified by tracing the flexor hallucis longus tendon proximally from the level of the first MTP joint to the level of the navicular where it crosses with the flexor digitorum longus. At this location, peritendinous injection may be performed by placing the needle tip within the sheath of both the flexor hallucis and flexor digitorum longus tendons by a medial-to-lateral approach; the injectate should coat both tendons (►Fig.…”

Clinical Anatomy of the Ankle and Foot

“…Pain at this site is increased by active motions of the big toe. 20 The true frequency of the condition among the many causes of plantar pain is unknown.…”