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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
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MR arthrogram of the postoperative glenoid labrum: normal postoperative appearance versus recurrent tears
Christin A Tiegs-Heiden1, Nicholas G Rhodes2, Mark S Collins2
1Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, MN, 55905, USA. tiegsheiden.christin@mayo.edu.
Skeletal Radiology
|May 14, 2018
Summary
MR arthrograms can accurately detect recurrent glenoid labral tears after repair, showing high sensitivity and specificity. Key indicators include fluid signal and labral thinning, with paralabral cysts also suggesting re-tear.
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging
Background:
- Glenoid labral tears are common shoulder injuries.
- Surgical repair is a primary treatment option.
- Assessing postoperative labral integrity is crucial for patient outcomes.
Purpose of the Study:
- To characterize the MR arthrogram appearance of the postoperative glenoid labrum.
- To identify imaging features indicative of recurrent glenoid labral tears.
Main Methods:
- Retrospective review of 30 patients who underwent glenoid labral repair and subsequent MR arthrogram.
- Blind assessment of MR arthrograms for labral status (normal, irregular, torn).
- Correlation of MR findings with repeat arthroscopy results and operative reports.
Main Results:
- MR arthrograms detected recurrent glenoid labral tears in 18/30 cases and irregular labra in 11/30.
- The MR arthrogram diagnosis agreed with operative findings in 80% of cases.
- Sensitivity and specificity for recurrent tear diagnosis were 83.3% and 81.8%, respectively.
Conclusions:
- MR arthrogram findings of fluid signal within or beneath the labrum and labral thinning are key indicators of recurrent tears.
- Paralabral cysts are a sensitive secondary finding for recurrent tears.
- Careful interpretation is needed, as some anterosuperior labral signal may be normal.
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