Manufacture of Soft-Hard Implants from Electrospun Filaments Embedded in 3D Printed Structures

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Tissue Engineering

Background:

• Rotator cuff tears are prevalent musculoskeletal injuries requiring surgical intervention.
• High re-tear rates (up to 40%) post-surgery, especially at the bone-tendon junction, represent a significant clinical challenge.
• Biphasic materials that replicate the soft-to-hard interface are needed to improve surgical outcomes.

Purpose of the Study:

• To develop and evaluate a novel biphasic scaffold for rotator cuff repair.
• To mimic the native bone-tendon interface using a combination of electrospinning and 3D printing.
• To assess the mechanical properties and biocompatibility of the fabricated scaffold.

Main Methods:

• A manufacturing approach combining electrospun polydioxanone (soft component) and 3D printed polycaprolactone (hard component) was employed.
• Scaffolds were designed to match the supraspinatus tendon footprint, with cuff size scaled to achieve clinically relevant strength.
• Biological evaluation included cytotoxicity assays and cell culture studies with tendon and bone cells.

Main Results:

• The biphasic scaffold successfully integrated soft and hard components mimicking the bone-tendon interface.
• Mechanical testing demonstrated an average strength of 227N, suitable for rotator cuff repair.
• Biological assessments confirmed non-cytotoxicity and demonstrated selective cell growth (tendon cells on cuff, bone cells on block).

Conclusions:

• The combination of electrospinning and 3D printing offers a feasible method for creating effective biphasic scaffolds.
• These scaffolds show potential for enhancing rotator cuff repair by providing a biomimetic interface.
• Further development could lead to improved clinical outcomes and reduced re-tear incidence in rotator cuff surgery.