Suture Techniques in Orthopaedics

Suture Techniques in Orthopaedics - Thread Essentials

• Types:
  • Absorbable: Degrade over time.
    • Natural: Catgut (plain, chromic) - high tissue reactivity.
    • Synthetic: PGA (Dexon), Polyglactin 910 (Vicryl), PDS II, Monocryl - lower reactivity.
  • Non-Absorbable: Permanent.
    • Natural: Silk - braided, high tissue reactivity.
    • Synthetic: Nylon (Ethilon), Polypropylene (Prolene), Polyester (Ethibond), Steel.
• Properties:
  • Tensile Strength: Resists breakage.
  • Knot Security: Holds knots.
  • Tissue Reactivity: Inflammatory response.
  • Memory: Returns to original shape.
  • Capillarity: Wick effect (fluid absorption).
• Sizing (USP): More zeros (e.g., 5-0) = smaller diameter.

⭐ Prolene (Polypropylene) is preferred for tendon repairs requiring high tensile strength and minimal tissue reaction.

Suture Techniques in Orthopaedics - Point & Tie Perfection

• Suture Materials:
  • Types: Absorbable (Vicryl, PDS); Non-absorbable (Prolene, Ethibond).
  • Structure: Monofilament (↓ drag, ↓ infection) vs. Multifilament (↑ handling, ↑ knot security, ↑ infection risk).
• Orthopaedic Needles:
  • Common: Taper-point (muscle, fascia), Reverse Cutting (tendon, ligament; ↓ pull-through), Conventional Cutting (skin).
  • Size denoted by number (larger number = smaller needle).
• Knot Tying:
  • Square Knot: Foundation; min 3-4 throws for security.
  • Surgeon’s Knot: Double first throw for ↑ friction under tension.

⭐ In tendon repair, locking sutures (e.g., Krackow, Kessler) or multi-strand techniques significantly enhance repair strength and reduce gapping.

Suture Techniques in Orthopaedics - Stitching Strong Repairs

• Principles: Asepsis, atraumatic handling, good apposition, secure knots, preserve vascularity.
• Suture Materials:
  • Absorbable: Vicryl, PDS (long-term), Monocryl (short-term).
  • Non-absorbable: Prolene, Ethibond, FiberWire (high strength).
• Needle Types: Taper (fascia), Reverse Cutting (skin, tough tissue).
• Knot Security: Square/Surgeon's knot. Min. 3-4 throws (monofilament), 2-3 (braided).
• Common Techniques:
  • Skin: Simple interrupted, Vertical/Horizontal mattress, Subcuticular.
  • Tendon: Kessler, Bunnell, Krackow (locking loop).
  • Meniscus: All-inside, Inside-out, Outside-in.

⭐ The Krackow stitch, a locking loop technique, offers superior strength for tendon-to-bone or ligament-to-bone repairs, crucial in ACL reconstruction.

Suture Techniques in Orthopaedics - Complications & Pro Tips

• Common Complications:
  • Infection (stitch abscess, SSI)
  • Wound dehiscence, edge necrosis
  • Suture sinus or granuloma
  • Allergic reaction to suture material
  • Iatrogenic neurovascular injury
  • Hypertrophic scarring or keloid
  • Suture extrusion ("spitting")
  • Hematoma/Seroma formation
• Pro-Tips for Success:
  • Meticulous aseptic technique.
  • Suture Selection: Match material (absorbable/non-absorbable, mono/braided) and size to tissue.
  • Knot Tying: Secure square knots, avoid excessive tension. "Approximate, don't strangulate."
  • Technique: Evert skin edges. Minimize tension (undermine if needed).
  • Gentle tissue handling prevents ischemia.
  • Cosmesis: Use subcuticular sutures for aesthetic results.
  • Removal: Timely, site-specific (face 3-5d, limbs 10-14d, joints 14d).

⭐ Monofilament sutures (e.g., Prolene, PDS) are preferred over multifilament (e.g., Silk, Vicryl) in contaminated wounds due to lower infection risk.

High‑Yield Points - ⚡ Biggest Takeaways

• Knot security is paramount; surgeon's knot ensures reliability, while sliding knots (e.g., Duncan loop) are key in arthroscopy.
• Use absorbable sutures (e.g., Vicryl, PDS) for deep tissues and non-absorbable (e.g., Ethibond, FiberWire) for tendons, ligaments, or skin needing prolonged strength.
• Monofilament sutures (e.g., PDS, Prolene) generally cause less tissue reaction and have ↓ infection risk compared to multifilament (e.g., Vicryl, Ethibond).
• Common tendon repair techniques include Kessler, Bunnell, and modified Kessler; locking sutures like Krackow provide ↑ repair strength.
• Suture anchors are indispensable for secure reattachment of soft tissues (ligaments, tendons) to bone.
• Needle selection is critical: tapered needles for delicate tissues, cutting needles (conventional or reverse) for tougher structures like skin or fibrocartilage.
• Tensile strength, knot holding capacity, and tissue reactivity are primary factors guiding suture material choice for optimal healing outcomes.