クラシックバレエ練習生に生じた弾発母趾の1例

Trigger Hallux Caused by Tenosynovitis of the Flexor Hallucis Longus Tendon in a Classical Ballet Dancer. Case Report

　手指の弾発現象を伴う腱놼炎は日常診療でしばしば経験するが，足趾に生じる例は稀である．クラシックバレエ練習生に生じた長母趾屈筋腱腱놼炎に対し腱놼切開術を行い，バレエに復帰できた1例を経験した．症例は12歳の女児で両側の母趾が屈曲位から伸展する際に大きな音を伴った弾発現象を認めた．腱놼の遠位で長母趾屈筋腱の肥厚を認め，両側の腱놼切開術を施行した．術後，弾発現象は消失し，術後4週からクラシックバレエを再開できた．

　We report a case of tenosynovitis of the flexor hallucis longus tendons in a classical ballet dancer who subsequently underwent the surgical release of both flexor hallucis longus tendons. Trigger finger is common, but trigger hallux is rare. The patient was a 12-year-old female amateur classical ballet dancer who had started dancing at the age of 6 years. She complained of the triggering of both halluces and a pain in the posteromedial aspect of the right ankle. A physical examination revealed that the triggering of the halluces occurred at the ankle plantar flexion position. We surgically released the flexor hallucis longus tendons. A fusiform thickening of the tendons at the distal part of the sheath was observed. She returned to dancing after 4 weeks without experiencing any pain or triggering of the halluces.