Dynamic Digital Radiography is a Valid and Reliable Alternative to 3D Registration for Scapulohumeral Rhythm Analysis

March 1, 2026JSES InternationalOpen Access

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The study aims to determine the reliability of dynamic digital radiography for scapulohumeral rhythm analysis compared to traditional 3D registration techniques.
Dynamic digital radiography performed on 22 reverse shoulder arthroplasty shoulders postoperatively.
Manual measurements of glenohumeral and scapulothoracic angles taken at intervals during shoulder elevation.
Comparison of SHR values from DDR with those from a 3D to 2D registration model.
High inter-class correlation coefficients for glenohumeral angles (0.989) and scapulothoracic angles (0.955) from DDR.
Intra-class correlations for glenohumeral angles were 0.999 and for scapulothoracic angles across different reference points ranged from 0.963 to 0.999.
No significant differences found in SHR measurements between DDR and 3D to 2D methods across all shoulder elevation intervals.

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Dynamic digital radiography provides valid scapulohumeral rhythm analysis compared to 3D registration, indicating a reliable method for clinical use.

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Khawaja et al. (2026) studied this question.

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