What does this research mean for the field?

Higher values of the acromial index and critical shoulder angle are significantly associated with the presence of rotator cuff tears. Novelty: ClaimNovelty.INCREMENTAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the relationship between the acromial index, critical shoulder angle, and rotator cuff tears, while assessing the intra- and inter-rater reliability of these radiographic measurements.

September 12, 2026MUSCULOSKELETAL SURGERYOpen Access

There is a relationship between the acromial index, the critical shoulder angle, and rotator cuff tears

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Authors

MFMarcos Rassi FernandesUniversidade Federal de Goiás

Discussion

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Implication

Cross-sectional study finds increased acromial index and critical shoulder angle in rotator cuff tears, highlighting anatomical parameters as potential structural risk factors.

Key Points

To determine the relationship between the acromial index, critical shoulder angle, and rotator cuff tears, while assessing the intra- and inter-rater reliability of these radiographic measurements.
Conducted a cross-sectional study analyzing digital radiographs across 163 shoulders: 56 with rotator cuff tears, 49 with calcific tendinitis, and 58 controls.
Three blinded researchers independently measured the acromial index and critical shoulder angle twice, separated by a 7-day interval.
Evaluated measurement reliability using intraclass correlation coefficients and compared group means using Tukey's test (alpha = 0.05).
Shoulders with rotator cuff tears had the highest mean values for both acromial index and critical shoulder angle compared to calcific tendinitis and control groups (p < 0.05).
Both anatomical measurements demonstrated excellent intra- and inter-rater agreement across observers.

Cite This Study

Marcos Rassi Fernandes (2026) studied this question.

synapsesocial.com/papers/6aa7b35095a386ecd3876154 https://doi.org/10.1007/s12306-026-00976-3

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Implication

Cross-sectional study finds increased acromial index and critical shoulder angle in rotator cuff tears, highlighting anatomical parameters as potential structural risk factors.

There is a relationship between the acromial index, the critical shoulder angle, and rotator cuff tears

Discussion

Member takes

Implication

Key Points

Cite This Study

There is a relationship between the acromial index, the critical shoulder angle, and rotator cuff tears

Discussion

Member takes

Implication

Key Points

Cite This Study

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