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Subluxation of the extensor carpi ulnaris on magnetic resonance imaging on neutral wrist position: correlation with tenosynovitis of the extensor carpi ulnaris and translation of the distal radioulnar joint

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Abstract

Objective

To identify the subluxation degrees of extensor carpi ulnaris (ECU) tendon on neutral wrist MRI in patients with ulnar-sided wrist pain and to evaluate the relationships of ECU subluxation with accompanying imaging findings such as ECU tenosynovitis, distal radioulnar joint (DRUJ) stability, and triangular fibrocartilage complex (TFCC) pathology.

Materials and methods

A total of 297 MRIs of 292 patients having ulnar side pain were reviewed retrospectively. Degrees of ECU subluxation was classified into four grades: grade 0, no subluxation; grade 1, tendon displacement < 50% of the tendon width; grade 2, tendon displacement 51 to 99% of the tendon width; and grade 3, tendon displacement of 100% of the tendon width. ECU tenosynovitis, ECU tendinosis, injuries of triangular fibrocartilage and distal radioulnar ligaments (DRUL), translation ratio of the DRUJ, rotation angle of the DRUJ, and the width, depth, and length of the ulnar groove were assessed on wrist MRI. The relationships between degree of ECU subluxation and these imaging findings were investigated.

Results

Women had higher subluxation degrees of the ECU tendon (p = 0.001). Tenosynovitis of the ECU, sprain of the dorsal DRUL, dorsovolar translation ratio and rotation angle of the DRUJ, and depth and length of the ulnar groove were statistically significantly related to the subluxation degree of the ECU tendon (p = 0.000).

Conclusion

High-grade subluxation of the ECU tendon was strongly correlated with ECU tenosynovitis and DRUJ translation. Clinicians and radiologists should scrutinize imaging findings, particularly when patients with ulnar-sided wrist pain have high-grade subluxation of the ECU tendon.

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Authors and Affiliations

  1. Department of Radiology, Kangbuk Samsung Hospital, 29 Saemunan-ro, Jongno-gu, 03181, Seoul, Republic of Korea

    Ji Na Kim

  2. Department of Radiology, Chungnam National University Hospital, Chungnam National University School of Medicine, 282 Munwha-ro Jung-gu, 35015, Daejeon, Republic of Korea

    Soon Tae Kwon

  3. Department of Orthopaedic Surgery, Chungnam National University Hospital, Chungnam National University School of Medicine, 282 Munwha-ro Jung-gu, 35015, Daejeon, Republic of Korea

    Hyun Dae Shin

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  1. Ji Na Kim
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Correspondence to Soon Tae Kwon.

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This study was approved by our institutional review board, which waived written informed consent (IRB File No. KBSMC 2020-02-033).

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The authors declare that they have no conflict of interest.

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Kim, J.N., Kwon, S.T. & Shin, H.D. Subluxation of the extensor carpi ulnaris on magnetic resonance imaging on neutral wrist position: correlation with tenosynovitis of the extensor carpi ulnaris and translation of the distal radioulnar joint. Skeletal Radiol 50, 1593–1603 (2021). https://doi.org/10.1007/s00256-020-03705-4

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  • DOI: https://doi.org/10.1007/s00256-020-03705-4

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