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Glenoid Bone Loss Measurement in Recurrent Shoulder Dislocation: Assessment of Measurement Agreement Between CT and MRI.

Friedman LG, Ulloa SA, Braun DT, Saad HA, Jones MH, Miniaci AA - Orthop J Sports Med (2014)

Bottom Line: Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid; horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement.There is moderate correlation between MRI and CT scans when measuring the glenoid, indicating that taking the length-to-height ratio measurements across the glenoid is a promising way to estimate the glenoid defect.At present, a complete workup of a patient with shoulder instability includes both a CT scan and an MRI.

View Article: PubMed Central - PubMed

Affiliation: Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.

ABSTRACT

Background: Shoulder instability can cause both soft tissue injury and bone defects, requiring both computed tomography (CT) and magnetic resonance imaging (MRI) for a thorough workup, which results in high patient costs and radiation exposure. Prior studies in cadaveric and nonclinical models have shown promise in assessing preoperative bone loss utilizing MRI.

Purpose: To evaluate the utility of MRI in detecting and evaluating glenoid bone defects in a clinical setting. The aim was to establish whether similar information could be determined by utilizing MRI and CT in a population with recurrent instability.

Study design: Cohort study (diagnosis); Level of evidence, 2.

Methods: CT and MRI scans of 22 shoulders were read by 4 orthopaedic surgeons. The CT images were obtained on a 2-dimensional CT scanner. Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid; horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement. The same protocol was followed for MRI measurements. An intraclass correlation coefficient (ICC) was calculated.

Results: There was a moderate amount of agreement between examiners for the height measurements on MRI (ICC, 0.53) and a substantial agreement for the CT images (ICC, 0.64). The width measurements for MRI had a moderate amount of agreement (ICC, 0.41), while the CT images had a fair agreement (ICC, 0.39). The height measurements between the measurements of MRI and CT images had an overall ICC of 0.43, while the width measurements had an overall ICC of 0.41, both of which were considered a moderate amount of agreement.

Conclusion: There is moderate correlation between MRI and CT scans when measuring the glenoid, indicating that taking the length-to-height ratio measurements across the glenoid is a promising way to estimate the glenoid defect. At present, a complete workup of a patient with shoulder instability includes both a CT scan and an MRI. Future research that establishes precisely how MRI misestimates CT measurements of the glenoid can perhaps obviate the need for 2 scans.

No MeSH data available.


Related in: MedlinePlus

Example of measurements made across the face of a glenoid on a T1-weighted MRI scan.
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fig1-2325967114549541: Example of measurements made across the face of a glenoid on a T1-weighted MRI scan.

Mentions: All CT and MRI scans for each patient were read by 3 shoulder surgeons at the end of their fellowship year in sports medicine and 1 senior orthopaedic attending with 25 years of postfellowship training. All readers were blinded to both patient identity and clinical history. For each shoulder, a T1-weighted MRI scan was selected that best showed the glenoid bone defect and was used for taking the length-to-height ratio measurements across the glenoid. Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid. Horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement (Figure 1). The same protocol was followed for CT scan measurements. The MRI images were all obtained using a 3-T MRI scanner. The CT images were obtained on a 2-dimensional CT scanner.


Glenoid Bone Loss Measurement in Recurrent Shoulder Dislocation: Assessment of Measurement Agreement Between CT and MRI.

Friedman LG, Ulloa SA, Braun DT, Saad HA, Jones MH, Miniaci AA - Orthop J Sports Med (2014)

Example of measurements made across the face of a glenoid on a T1-weighted MRI scan.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2 - License 3
Show All Figures
getmorefigures.php?uid=PMC4555629&req=5

fig1-2325967114549541: Example of measurements made across the face of a glenoid on a T1-weighted MRI scan.
Mentions: All CT and MRI scans for each patient were read by 3 shoulder surgeons at the end of their fellowship year in sports medicine and 1 senior orthopaedic attending with 25 years of postfellowship training. All readers were blinded to both patient identity and clinical history. For each shoulder, a T1-weighted MRI scan was selected that best showed the glenoid bone defect and was used for taking the length-to-height ratio measurements across the glenoid. Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid. Horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement (Figure 1). The same protocol was followed for CT scan measurements. The MRI images were all obtained using a 3-T MRI scanner. The CT images were obtained on a 2-dimensional CT scanner.

Bottom Line: Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid; horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement.There is moderate correlation between MRI and CT scans when measuring the glenoid, indicating that taking the length-to-height ratio measurements across the glenoid is a promising way to estimate the glenoid defect.At present, a complete workup of a patient with shoulder instability includes both a CT scan and an MRI.

View Article: PubMed Central - PubMed

Affiliation: Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.

ABSTRACT

Background: Shoulder instability can cause both soft tissue injury and bone defects, requiring both computed tomography (CT) and magnetic resonance imaging (MRI) for a thorough workup, which results in high patient costs and radiation exposure. Prior studies in cadaveric and nonclinical models have shown promise in assessing preoperative bone loss utilizing MRI.

Purpose: To evaluate the utility of MRI in detecting and evaluating glenoid bone defects in a clinical setting. The aim was to establish whether similar information could be determined by utilizing MRI and CT in a population with recurrent instability.

Study design: Cohort study (diagnosis); Level of evidence, 2.

Methods: CT and MRI scans of 22 shoulders were read by 4 orthopaedic surgeons. The CT images were obtained on a 2-dimensional CT scanner. Vertical measurements were taken from the superior glenoid tubercle and directed inferiorly along the glenoid; horizontal measurements were taken across the widest part of the face of the glenoid and were perpendicular within one-half of 1° to the vertical measurement. The same protocol was followed for MRI measurements. An intraclass correlation coefficient (ICC) was calculated.

Results: There was a moderate amount of agreement between examiners for the height measurements on MRI (ICC, 0.53) and a substantial agreement for the CT images (ICC, 0.64). The width measurements for MRI had a moderate amount of agreement (ICC, 0.41), while the CT images had a fair agreement (ICC, 0.39). The height measurements between the measurements of MRI and CT images had an overall ICC of 0.43, while the width measurements had an overall ICC of 0.41, both of which were considered a moderate amount of agreement.

Conclusion: There is moderate correlation between MRI and CT scans when measuring the glenoid, indicating that taking the length-to-height ratio measurements across the glenoid is a promising way to estimate the glenoid defect. At present, a complete workup of a patient with shoulder instability includes both a CT scan and an MRI. Future research that establishes precisely how MRI misestimates CT measurements of the glenoid can perhaps obviate the need for 2 scans.

No MeSH data available.


Related in: MedlinePlus