What are the recommended uses, available sizes, and knot‑tying technique for Ethibond (polyester braided, non‑absorbable) suture in orthopedic tendon and ligament repairs?

Ethibond Suture: Clinical Applications and Technical Considerations

Ethibond (braided polyester, non-absorbable) suture is NOT the optimal choice for orthopedic tendon and ligament repairs based on current evidence, as modern polyblend sutures (FiberWire, Ultrabraid, MaxBraid) demonstrate superior biomechanical properties including higher load to failure and greater stiffness. 1

Biomechanical Properties and Comparative Performance

Ethibond consistently demonstrates inferior mechanical characteristics compared to newer-generation polyblend materials:

• Maximum Load to Failure: Ethibond No. 2 shows the lowest load to failure across multiple studies, with No. 5 Ethibond (437 N) significantly weaker than FiberWire No. 5 (625 N) 2, 3, 1
• Stiffness: Ethibond ranks among the least stiff sutures tested, which may allow greater deformation during healing 1
• Knot Security: While Ethibond No. 2 demonstrates excellent knot security with minimal slippage (0.1 ± 0.3 mm), this advantage is offset by lower overall tensile strength 2

Direct Comparative Data

When tested head-to-head, Ethibond No. 6 (338 N) demonstrated significantly lower ultimate load compared to Polylene tape (474 N) and Mersilene tape (437 N) in ACL reconstruction applications 4. In cyclic loading tests simulating physiologic stress, all three high-strength polyblend sutures (FiberWire, Orthocord, MaxBraid) significantly outperformed Ethibond in single load to failure testing 3.

Available Sizes and Clinical Context

Ethibond is available in multiple sizes (No. 00,2,5, and larger), but size alone does not guarantee superior performance—larger diameter Ethibond sutures still underperform compared to smaller diameter polyblend alternatives 2.

Knot-Tying Technique Recommendations

Critical knot configuration: Use the 3 reverse half-hitches on alternating posts (3-RHAP) technique, which provides superior security regardless of suture material 3.

Specific Technical Points:

• Avoid the overhand with 3 same half-hitches on same post (O-3SHSP) configuration—this consistently fails by knot slippage across all suture types 3
• When using Ethibond specifically, the Geelong knot demonstrates optimal performance with low coefficient of variation (CV: 4.2%) in wet conditions 5
• Ethibond requires more knot throws to achieve security compared to polyblend materials due to its braided multifilament structure

Clinical Caveats and Appropriate Use

Where Ethibond May Still Be Considered:

• Cost-sensitive settings where polyblend sutures are unavailable
• Repairs where knot security is paramount and tensile strength demands are lower
• Situations requiring a non-absorbable suture with proven long-term biocompatibility

Important Limitations:

• Multifilament structure increases infection risk: Current guidelines strongly recommend monofilament over multifilament sutures for fascial closure due to lower incisional hernia rates 6. While these guidelines address abdominal surgery, the principle of bacterial seeding in multifilament materials applies to orthopedic repairs 7
• Inferior elongation properties: Ethibond shows greater elongation under load compared to modern alternatives, potentially compromising repair integrity during early healing 2, 1
• Knot bulk: Larger diameter Ethibond (No. 5) creates significantly larger knot volumes (53 ± 4.8 mm³) compared to equivalent strength polyblend options 2

Evidence-Based Recommendation Algorithm

For orthopedic tendon/ligament repairs requiring high tensile strength:

1. First choice: FiberWire No. 2 (highest load to failure, lowest elongation, highest stiffness) 3, 1
2. Alternative: Ultrabraid or MaxBraid No. 2 (comparable strength, different handling characteristics) 1
3. Budget-constrained: Ethibond No. 5 with 3-RHAP knot configuration (accept lower mechanical properties) 2, 3

For repairs where knot security outweighs absolute strength:

• Ethibond No. 2 with Geelong knot configuration remains viable 5

The evidence clearly demonstrates that while Ethibond remains a functional non-absorbable suture with excellent knot-holding capacity, modern polyblend materials provide superior biomechanical performance for high-demand orthopedic applications where morbidity from repair failure would be significant 8, 3, 1.