Peer-reviewed veterinary case report
Polypropylene mesh does not improve shoulder repair strength in sheep
By Karademir G et al.·2026·Acibadem Mehmet Ali Aydinlar University School of Medicine·View original on Europe PMC →
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Original publication title: Polypropylene mesh reinforcement does not improve acute biomechanical properties in superior capsular reconstruction: an ovine model study.
- Species:
- sheep
Plain-English summary
This study looked at a surgical technique called superior capsular reconstruction (SCR), which is used to fix severe tears in the shoulder's rotator cuff. Researchers tested whether adding a material called polypropylene mesh to the surgery would make the repair stronger. They used sheep shoulders to compare two groups: one that had the standard repair with just fascia grafts and another that included the mesh. The results showed that both groups performed similarly in terms of strength and stability right after the surgery, meaning the mesh did not provide any immediate benefits. Overall, the addition of the mesh did not improve the initial performance of the grafts in this study.
Abstract
<h4>Background</h4>Superior capsular reconstruction (SCR) is a treatment option for irreparable rotator cuff tears (IRCTs), yet graft failure remains a significant limitation. While fascia (FA) grafts are commonly used, postoperative outcomes can be suboptimal, potentially contributing to higher mechanical failure rates. Polypropylene mesh (PM) augmentation has shown promise in improving soft-tissue repair strength, but its acute biomechanical efficacy in SCR remains insufficiently investigated. This study aimed to evaluate whether PM augmentation enhances the biomechanical stability of FA grafts in SCR using an ovine model.<h4>Methods</h4>Ten fresh-frozen ovine cadaveric shoulders were used to model IRCT. Only one shoulder per animal was included to ensure specimen independence. Specimens were randomly assigned to two treatment groups: FA-only SCR (FA-SCR) and PM-reinforced FA-SCR (PMFA-SCR). In the PMFA-SCR group, the mesh was placed within the FA graft prior to folding and suturing. Grafts were fixed to the glenoid and humerus using suture anchors, with two anchors placed on the glenoid anterosuperior/posterosuperior and two on the humerus footprint anterior/posterior in all specimens. Biomechanical testing was conducted with a custom device, with specimens mounted at 30° abduction. Dynamic testing involved cyclic loading from 10 to 50 N at 1 Hz for 1000 cycles, with displacement and stiffness recorded. Immediately afterward, static load-to-failure testing was performed at a crosshead speed of 20 mm/min to determine the ultimate load, yield load, and failure mode. Data were analyzed using the Student's t-test.<h4>Results</h4>FA-SCR and PMFA-SCR demonstrated similar biomechanical performance, with comparable displacements both at the initial stage (p = 0.74) and after 1000 cycles (p = 0.83). No significant differences were observed in cumulative displacement (p = 0.63) or cyclic stiffness after the first or final cycle (p = 0.68 and p = 0.82). Static testing showed no significant differences in ultimate load-to-failure (p = 0.75), displacement (p = 0.57), yield load (p = 0.92), or final stiffness (p = 0.69).<h4>Conclusions</h4>In an acute ex vivo ovine model, PM augmentation did not improve the time-zero biomechanical performance of FA grafts in SCR, indicating that any potential benefit of mesh augmentation may be time-dependent and biologically mediated.<h4>Level of evidence</h4>V.
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Search related cases →Original publication on Europe PMC: https://europepmc.org/article/MED/41723480