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Archives of Orthopaedic and Trauma Surgery

, Volume 133, Issue 2, pp 219–226 | Cite as

The importance of CT for the pre-operative surgical planning in recurrent anterior shoulder instability

  • Philipp Moroder
  • Herbert Resch
  • Silke Schnaitmann
  • Thomas Hoffelner
  • Mark Tauber
Arthroscopy and Sports Medicine

Abstract

Background

MRI is the current pre-operative imaging standard in recurrent anterior shoulder instability; however, CT has increasingly gained interest due to its advantages in the detection of bony glenoid defects. This study compares the value of CT imaging and MRI for pre-operative surgical planning in recurrent anterior shoulder instability.

Methods

Between 2006 and 2009, 83 patients presented to the author’s department with recurrent anterior shoulder instability. For 48 patients, both, pre-operative MRI and CT images were available. The respective patho-morphological descriptions were retrospectively compared with the intra-operative findings. The effect of each imaging technique on the pre-operative surgical planning was analyzed and the accuracy in predicting the necessity of open versus arthroscopic surgery was compared.

Results

In determining the necessity of open versus arthroscopic surgery CT imaging rendered an inaccurate prediction in 4.8 % of the cases which is less than the 25.0 % calculated for MRI. (p = 0.019). MRI showed a low sensitivity (35.3 %) in the detection of significant glenoid bone defects (≥20 % of the glenoid width measured on en-face views using a best-fit circle technique) while CT imaging provided an accurate prediction of the intra-operative finding in all cases.

Conclusion

Despite the advantages of MRI in the detection of soft tissue damages in recurrent anterior shoulder instability CT imaging proved to be more important for pre-operative planning by prevailing in the detection of glenoid defects. Therefore, the replacement of MRI as preoperative imaging standard with CT imaging is recommended.

Keywords

Recurrent anterior shoulder instability Shoulder instability CT imaging MRI Glenoid bone loss Glenoid defect Labral tear 

Notes

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • Philipp Moroder
    • 1
  • Herbert Resch
    • 1
  • Silke Schnaitmann
    • 1
  • Thomas Hoffelner
    • 1
  • Mark Tauber
    • 1
    • 2
  1. 1.Department of Traumatology and Sports InjuriesParacelsus Medical UniversitySalzburgAustria
  2. 2.Department of Shoulder and Elbow SurgeryAtos ClinicMunichGermany

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