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Objectives <p>To describe typical MRI findings 1 year after reverse total shoulder arthroplasty (rTSA) implantation.</p> Materials and methods <p>Metal artifact reduction (MARS) MRI including CSSEMAC techniques was prospectively acquired in <i>N</i> = 25 consecutive patients (18/25 female; 61–80 years) 1 year after rTSA. MRI findings of bone and soft tissue and artifact reduction were assessed semi-quantitatively. Clinical Constant-Murley scores (CMS) were obtained, including its subscores pain, activities-of-daily-living (ADL), range-of-motion (ROM), and strength. Preoperative MRI was available in 13/25 subjects. Statistical analyses included descriptive statistics, Spearman correlations, nonparametric tests, and multivariable regression models.</p> Results <p>MARS MRI of rTSA showed overall good image quality. Subacromial edema (88%), mild effusion (52%), and synovitis (44%) were frequent postoperative findings. Synovitis was associated with more pain (<i>B</i> = −2.044, 95% CI [−3.617, −0.470], <i>p</i> = 0.039) and lower strength (<i>B</i> = −4.497, 95% CI [−7.101, −1.893], <i>p</i> = 0.008). Minor bone marrow edema (BME) at the shaft was found in all subjects (100%). BME in Gruen zone 4 (88%) and 6 (80%) was most frequent. A higher number of Gruen zones with BME correlated significantly with lower ADL (<i>R</i> = −0.532, <i>p</i> = 0.024). There was a significant increase in fatty infiltration between pre- and postoperative images for the midacromial deltoid muscle (1 (IQR, 1–1) versus 2 (IQR, 1–2), <i>p</i> = 0.008; postoperatively present 100%). It was associated with an increase in deltoid length (chi-square 4.35, <i>p</i> = 0.037), but not with inferior clinical scores. However, fatty infiltration of the more anterior deltoid muscle was associated with lower ADL (<i>B</i> = −3.064, <i>p</i> = 0.008).</p> Conclusion <p>Subacromial edema, minor shaft BME, and fatty infiltration of the midacromial deltoid muscle were typical, asymptomatic MRI findings 1 year after rTSA.</p>

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Metal-artifact reduced MR imaging for reverse shoulder arthroplasty: findings 1 year after surgery

  • 期刊论文

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  • 发表日期：

    2026年1月21日

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  • Pia M. Jungmann,
  • Martin Jaeger,
  • Ferdinand C. Wagner,
  • Balazs Bogner,
  • Arsenij Molotkov,
  • Thierno Diallo,
  • Ralph Strecker,
  • Reto Sutter,
  • Fabian Bamberg,
  • Matthias Jung

摘要

Objectives

To describe typical MRI findings 1 year after reverse total shoulder arthroplasty (rTSA) implantation.

Materials and methods

Metal artifact reduction (MARS) MRI including CSSEMAC techniques was prospectively acquired in N = 25 consecutive patients (18/25 female; 61–80 years) 1 year after rTSA. MRI findings of bone and soft tissue and artifact reduction were assessed semi-quantitatively. Clinical Constant-Murley scores (CMS) were obtained, including its subscores pain, activities-of-daily-living (ADL), range-of-motion (ROM), and strength. Preoperative MRI was available in 13/25 subjects. Statistical analyses included descriptive statistics, Spearman correlations, nonparametric tests, and multivariable regression models.

Results

MARS MRI of rTSA showed overall good image quality. Subacromial edema (88%), mild effusion (52%), and synovitis (44%) were frequent postoperative findings. Synovitis was associated with more pain (B = −2.044, 95% CI [−3.617, −0.470], p = 0.039) and lower strength (B = −4.497, 95% CI [−7.101, −1.893], p = 0.008). Minor bone marrow edema (BME) at the shaft was found in all subjects (100%). BME in Gruen zone 4 (88%) and 6 (80%) was most frequent. A higher number of Gruen zones with BME correlated significantly with lower ADL (R = −0.532, p = 0.024). There was a significant increase in fatty infiltration between pre- and postoperative images for the midacromial deltoid muscle (1 (IQR, 1–1) versus 2 (IQR, 1–2), p = 0.008; postoperatively present 100%). It was associated with an increase in deltoid length (chi-square 4.35, p = 0.037), but not with inferior clinical scores. However, fatty infiltration of the more anterior deltoid muscle was associated with lower ADL (B = −3.064, p = 0.008).

Conclusion

Subacromial edema, minor shaft BME, and fatty infiltration of the midacromial deltoid muscle were typical, asymptomatic MRI findings 1 year after rTSA.