Key result
3D biplane X-ray reconstruction measures glenohumeral displacement within ~1.4mm of CT with high reproducibility.
Why the study?
Rotator cuff tears may be associated with increased glenohumeral instability, which is difficult to quantify using current diagnostic tools.
Observational
The low-dose 3D biplane X-ray reconstruction technique is accurate and reproducible for assessing glenohumeral displacement, showing potential for evaluating instability in rotator cuff tears.
Supports low-dose dynamic glenohumeral assessment; leaves open prospective validation before clinical use in instability.
Rotator cuff (RC) tears may be associated with increased glenohumeral instability; however, this instability is difficult to quantify using currently available diagnostic tools. Recently, the three-dimensional (3D) reconstruction and registration method of the scapula and humeral head, based on sequences of low-dose biplane X-ray images, has been proposed for glenohumeral displacement assessment. This research aimed to evaluate the accuracy and reproducibility of this technique and to investigate its potential with a preliminary application comparing RC tear patients and asymptomatic volunteers. Accuracy was assessed using CT scan model registration on biplane X-ray images for five cadaveric shoulder specimens and showed differences ranging from 0.6 to 1.4mm depending on the direction of interest. Intra- and interobserver reproducibility was assessed through two operators who repeated the reconstruction of five subjects three times, allowing defining 95% confidence interval ranging from ±1.8 to ±3.6mm. Intraclass correlation coefficient varied between 0.84 and 0.98. Comparison between RC tear patients and asymptomatic volunteers showed differences of glenohumeral displacements, especially in the superoinferior direction when shoulder was abducted at 20° and 45°. This study thus assessed the accuracy of the low-dose 3D biplane X-ray reconstruction technique for glenohumeral displacement assessment and showed potential in biomechanical and clinical research.
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Zhang et al. (2015) conducted an observational in Rotator cuff tears. 3D biplane X-ray reconstruction technique vs. CT scan model registration and asymptomatic volunteers was evaluated on Accuracy and reproducibility of glenohumeral displacement assessment. The 3D biplane X-ray reconstruction technique demonstrated accuracy within 0.6 to 1.4mm compared to CT and high reproducibility (ICC 0.84-0.98) for assessing glenohumeral displacement.
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