Point of care ultrasound combined with CTS-6 to diagnose idiopathic carpal tunnel syndrome

Hiroo Kimura, Ryogo Furuhata, Tomoki Matsuo, Taku Suzuki, Noboru Matsumura, Kazuki Sato, Takuji Iwamoto

Research output: Contribution to journalArticlepeer-review

Abstract

Background: This study aimed to demonstrate the effectiveness of our new diagnostic chart using point of care ultrasound combined with CTS-6 for diagnosing idiopathic carpal tunnel syndrome. Methods: We conducted a retrospective analysis of the data of patients who visited our department and received point of care ultrasound combined with CTS-6 from 2020 to 2023. Data regarding age, sex, initial and final diagnosis, cross-sectional area of the median nerve, CTS-6 score, and electrodiagnostic severity were obtained and statistically analyzed. Results: Of the 177 wrists included in our study, 138 (78 %) were diagnosed with carpal tunnel syndrome, while 39 (22 %) were not (non-carpal tunnel syndrome). With our diagnostic method, 127 wrists (72 %) were diagnosed initially with carpal tunnel syndrome, 23 wrists (13 %) with non-carpal tunnel syndrome, and the rest 27 wrists (15 %) as borderline. Our initial diagnoses of carpal tunnel syndrome and non-carpal tunnel syndrome were maintained in all cases except for two. Cross-sectional area, CTS-6 score, and electrodiagnostic severity showed a positive correlation. A post hoc analysis showed that the new scoring system (CTS-6 score + 2 × cross-sectional area) with a cutoff value of 31.25 points showed a sensitivity as high as 95 % and a specificity of 100 %. Conclusions: Our findings suggest that most suspected idiopathic carpal tunnel syndrome cases can be diagnosed correctly using the diagnostic chart. Although additional tools, including electrodiagnostic studies, may be needed for borderline cases, the use of point of care ultrasound combined with CTS-6 may be a recommendable first-line confirmatory test because point of care ultrasound and CTS-6 could be complementary tools, and this chart may be especially beneficial for atypical or outlier cases. Level of evidence: Diagnostic III.

Original languageEnglish
Pages (from-to)85-90
Number of pages6
JournalJournal of Orthopaedic Science
Volume30
Issue number1
DOIs
Publication statusPublished - 2025 Jan

Keywords

  • CTS-6
  • Carpal tunnel syndrome
  • Electrodiagnostic study
  • Reference standard
  • Ultrasound

ASJC Scopus subject areas

  • Surgery
  • Orthopedics and Sports Medicine

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