Abstract
Background
A high signal intensity cleft between the labrum and articular cartilage of the posterior glenoid is commonly visible on MRI and has been suggested to be anatomic variation [3, 10, 23]. The association of a posterior cleft with variations in glenoid morphology or with shoulder instability is unknown.
Questions/Purposes
The purposes of this study were to determine if posterior chondrolabral clefts are associated with variations in glenoid morphology, and to determine if they are associated with shoulder instability.
Patients and Methods
Shoulder MRI was performed in 1,264 shoulders, 1,135 male (89.8%), and 129 female (10.2%). A musculoskeletal radiologist blinded to history and outcomes evaluated the MR images for linear high signal intensity at the posterior chondrolabral junction and a rounded or truncated contour of the posterior glenoid. Glenoid version and depth were measured. Patients were followed prospectively for shoulder instability for 4 years. Univariate and multivariate statistical analysis were performed.
Results
Posterior chondrolabral cleft was present in 114/1,264. Posterior chondrolabral cleft was associated with a rounded or truncated posterior glenoid. There were 9.5° retroversion in shoulders with a posterior cleft, and 7.7° retroversion in shoulders without a cleft. Shoulders with a posterior chondrolabral cleft were more likely to develop shoulder instability.
Conclusions
Posterior chondrolabral clefts are not uncommon on MRI. They are associated with a rounded or truncated posterior glenoid and a small but significant increase in glenoid retroversion. They are associated with shoulder instability.
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Disclosures
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Conflict of Interest:
Scot E. Campbell, MD, Robert M. Dewitt, MD, MPH, ATC, and Adrianne K. Thompson, MD have declared that they have no conflict of interest. Kenneth L Cameron, PhD reports grants from Orthopedic Research and Education Foundation, during the study. Brett D. Owens, MD reports grants from OREF, during the conduct of the study; personal fees from Mitek Sports Medicine and Musculoskeletal Transplant Foundation, outside the work.
Human/Animal Rights:
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 [5].
Informed Consent:
Informed consent was obtained from all patients for being included in the study.
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Level of Evidence: Level IV: Cohort study.
The views and opinions expressed in this manuscript are those of the author(s) and do not reflect the official policy of the Department of the Army, the US Air Force, the Department of Defense, or the US Government.
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Campbell, S.E., Dewitt, R.M., Cameron, K.L. et al. Posterior Chondrolabral Cleft: Clinical Significance and Associations with Shoulder Instability. HSS Jrnl 10, 208–212 (2014). https://doi.org/10.1007/s11420-014-9404-x
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DOI: https://doi.org/10.1007/s11420-014-9404-x