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Diagnostic accuracy of plain radiographs and cineradiography in diagnosing traumatic scapholunate dissociation

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Abstract

Objective

Missed tears of the scapholunate ligament (SLL) and scapholunate dissociation (SLD) after wrist injuries pose a high risk of post-traumatic osteoarthritis of the carpus. Plain X-rays and dynamic radiographic studies are frequently used for initial diagnostic work-up. Given the limited evidence of their accuracy, we retrospectively compared the radiographic findings of patients with suspected traumatic SLD with wrist arthroscopy as the accepted reference standard.

Design and methods

During a 6-year period, plain radiographs and DSA cineradiography scans were obtained from 198 patients who had sustained a hyperextension injury to their hand. Of those, 102 (72 men, 30 women, mean age of 42 ± 12 years) subsequently underwent diagnostic arthroscopy. Digital images were reevaluated by experienced radiologists unaware of the arthroscopic findings for the presence or absence of SLD. We calculated the sensitivity (SN) and specificity (SP) with 95% confidence intervals (CI), and computed areas under the receiver operating characteristic curves (AUC/ROC).

Results

Arthroscopy revealed 42 SLL ruptures, 13, 10, and 19 of which were classified as grade I (partial), II (complete with dynamic instability), or III (complete with static instability) respectively. Plain radiographs correctly identified 24 injuries (SN 57.1%, 95% CI 41.0–72.3%), and produced 1 false-positive result (SP 98.3%, 95% CI 91.1–100.0%). The scapholunate distance and the SL angle contributed independently to the diagnostic variance, with an AUC/ROC of 85.7% (95% CI 76.8–92.2%). Cineradiography had a sensitivity of 36 out of 42 (85.7%, 95% CI 71.5–94.6%), and a specificity of 57 out of 60 (95.0%, 95% CI 86.1–99.0%).

Conclusion

Pathological results on plain radiographs and cineradiography reliably indicate the presence of SLD after wrist trauma. Although non-conclusive, a negative dynamic study markedly reduces the pre-test probability of disease. Both methods remain key elements of primary diagnostic strategies for suspected traumatic SLD, and may facilitate the selection of additional tests.

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Authors and Affiliations

  1. Department of Hand Surgery, Replantation Surgery, and Microsurgery, Unfallkrankenhaus Berlin, Warener Strasse 7, 12683, Berlin, Germany

    Jenny Pliefke & Andreas Eisenschenk

  2. Center for Clinical Research, Department of Trauma and Orthopedic Surgery, Unfallkrankenhaus Berlin, Warener Strasse 7, 12683, Berlin, Germany

    Dirk Stengel & Axel Ekkernkamp

  3. Department of Trauma and Orthopedic Surgery, University of Greifswald, Greifswald, Germany

    Dirk Stengel & Axel Ekkernkamp

  4. Department of Radiology, Unfallkrankenhaus Berlin, Warener Strasse 7, 12683, Berlin, Germany

    Grit Rademacher & Sven Mutze

Authors
  1. Jenny Pliefke
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  2. Dirk Stengel
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Correspondence to Dirk Stengel.

Additional information

Jenny Pliefke and Dirk Stengel contributed equally to this study.

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Pliefke, J., Stengel, D., Rademacher, G. et al. Diagnostic accuracy of plain radiographs and cineradiography in diagnosing traumatic scapholunate dissociation. Skeletal Radiol 37, 139–145 (2008). https://doi.org/10.1007/s00256-007-0410-7

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  • DOI: https://doi.org/10.1007/s00256-007-0410-7

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