Abstract
Purpose
The purpose of this study is to describe rotator cuff muscle stiffness in patients with different degrees of rotator cuff tear (RCT) severity and to assess its predictive ability for RCT reparability.
Methods
One hundred and thirty-three consecutive patients who were scheduled to undergo arthroscopic shoulder surgery were prospectively enrolled. Tendon retraction, fatty infiltration, and muscle atrophy were evaluated using magnetic resonance imaging. Shear modulus of supraspinatus (SSP) and infraspinatus (ISP) muscles were measured by ultrasound shear wave elastography (SWE). The tear size and reparability were determined intraoperatively.
Results
There were 97 patients in RCT group and 36 patients in control group. Bilateral shear modulus discrepancy (Δshear modulus) was used to represent rotator cuff stiffness. Severely fatty-infiltrated rotator cuff muscles possessed a significantly higher stiffness compared with their counterparts (SSP: CI 27.8–31.8 vs. 13.5–15.6 kPa, ISP: CI 33.2–38.1 vs. 8.8–11.2 kPa, p < 0.001). The same trend applied to muscles with distinct tendon retraction (SSP: CI 27.7–32.3 vs. 10.9–14.9 kPa, ISP: CI 33.2–38.6 vs. 6.5–11.0 kPa, p < 0.001) and obvious muscle atrophy (SSP: CI 27.9–32.1 vs. 13.6–15.8 kPa, ISP: CI 32.9–38.2 vs. 9.0–11.7 kPa, p < 0.001). Irreparable massive RCT (MRCT) patients had significantly stiffer SSP (CI 27.7–31.9 vs. 13.5–16.5 kPa, p < 0.001) and ISP (CI 33.5–37.8 vs. 10.3–14.8 kPa, p < 0.001) than reparable MRCT. The Δshear modulus of the ISP was a highly accurate predictor of RCT reparability. A cutoff value of 18.0 kPa had a sensitivity of 100% and specificity of 98.8% for irreparable MRCT.
Conclusion
Ultrasound SWE-derived rotator cuff muscle stiffness is closely correlated with RCT size and severity.
Level of evidence
I.
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Funding
Funding was provided by Chongqing medical scientific research project (Grant no. 2021MSXM032).
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Jiaxing Huang, Lan Jiang, Jiawei Wang, Dandong Wu, Wei Huang, Ning Hu, and Hong Chen declare that they have no conflict of interest.
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All procedures performed in this prospective study were in accordance with the ethical standards of the First Affiliated Hospital of Chongqing Medical University. This study was approved by our institutional review board (IRB, No. 2020795) and registered in the Chinese Clinical Trial Register (ChiCTR2100042462).
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Huang, J., Jiang, L., Wang, J. et al. Ultrasound shear wave elastography-derived tissue stiffness is positively correlated with rotator cuff tear size and muscular degeneration. Knee Surg Sports Traumatol Arthrosc 30, 2492–2499 (2022). https://doi.org/10.1007/s00167-022-06892-w
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DOI: https://doi.org/10.1007/s00167-022-06892-w