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Is CT scan a predictor of instability in recurrent dislocation shoulder?
K P Shijith1, Munish Sood2, Ajay Deep Sud3
1Department of Radiology, Army Hospital (R & R), Delhi Cantt, 110010, India.
Summary
Computed tomography (CT) scans effectively assess bone loss in recurrent shoulder dislocations. More dislocations correlate with significant glenoid and Hill-Sachs lesions, with critical defects increasing dislocation frequency.
Area of Science:
- Orthopedic Surgery
- Radiology
- Sports Medicine
Background:
- Recurrent shoulder dislocations often involve glenoid bone defects and Hill-Sachs lesions.
- Computed tomography (CT) is the preferred imaging modality for evaluating these bony defects.
Purpose of the Study:
- To assess the clinical and radiological correlation in patients experiencing recurrent shoulder dislocations.
- To evaluate the relationship between the number of dislocations and the extent of bone loss.
Main Methods:
- A cohort of 44 patients with recurrent shoulder dislocations were evaluated clinically and radiologically using CT scans.
- Correlation between clinical history (number of dislocations) and CT-measured bone loss was analyzed.
- Statistical analysis was performed using IBM SPSS STATISTICS (version 22.0) with a significance level of α = 0.05.
Main Results:
- The study included 44 male patients with a mean age of 25.95 years; injuries occurred during sports (24) or training (20).
- Patients averaged 4.68 dislocations, with 41 showing glenoid bone loss and 40 having Hill-Sachs lesions.
- Mean glenoid width defect was 10.80%, mean Hill-Sachs defect was 14.27 mm, and 10 patients had "off-track" lesions.
Conclusions:
- CT scans are effective for quantifying bone loss in recurrent shoulder dislocations.
- The number of dislocations significantly correlates with "off-track" lesions and the degree of glenoid and Hill-Sachs bone loss.
- Glenoid width loss >9.80% or Hill-Sachs defect >14.80 mm are critical thresholds associated with increased dislocation frequency.
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