Ultrasound diagnosis and follow-up of a locked thumb metacarpophalangeal joint caused by radial sesamoid entrapment: A case report

Kyung Sik Ahn, In Cheul Choi, Chang Ho Kang, Jong Woong Park

Research output: Contribution to journalArticlepeer-review

Abstract

Background: A locked thumb metacarpophalangeal joint is a rare condition that presents as restricted joint motions with mild hyperextension deformity, usually after a relatively minor hyperextension injury. Owing to the limitations of radiographs, computed tomography is a useful diagnostic imaging modality for assessing sesamoid displacement. However, despite its convenience, ultrasound findings of the locked thumb have rarely been reported. Here, we report a case of a locked thumb metacarpophalangeal joint diagnosed and followed-up using ultrasound. Case presentation: A 15-year-old boy with a locked thumb metacarpophalangeal joint presented to our hospital. On physical examination, the 1st metacarpophalangeal joint was found to be hyperextended, and active and passive flexions were not possible. While radiographs were inconclusive, ultrasound revealed radial sesamoid entrapment at the 1st metacarpophalangeal joint causing locking. After closed manual reduction, metacarpophalangeal motions recovered. Success of the reduction was also confirmable by ultrasound. Conclusions: Ultrasound can be a feasible modality to diagnose a locked thumb metacarpophalangeal joint and immediately judge the success or failure of the reduction.

Original languageEnglish
Article number509
JournalBMC Musculoskeletal Disorders
Volume21
Issue number1
DOIs
Publication statusPublished - 2020 Jul 31

Keywords

  • Locked thumb
  • Metacarpophalangeal joint
  • Sesamoid
  • Ultrasound

ASJC Scopus subject areas

  • Rheumatology
  • Orthopedics and Sports Medicine

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