Biomechanical evaluation of flexor tendon repair techniques

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Musculoskeletal Research

Background:

• Immediate active mobilization is crucial for restoring function after flexor tendon injuries.
• Various suture techniques exist for flexor tendon repair, each with potential impacts on biomechanical strength.

Purpose of the Study:

• To compare the biomechanical properties of different suture techniques for human flexor digitorum profundus tendon repair.
• To determine the most effective suture methods for facilitating immediate active tendon motion.

Main Methods:

• Sixty human flexor digitorum profundus tendons were repaired using six different suture configurations (Kessler and Tang core sutures combined with running peripheral, cross-stitch, or Halsted peripheral sutures).
• Tensile testing was performed immediately post-repair to measure 2-mm gap formation force, ultimate strength, elastic modulus, and energy to failure.

Main Results:

• The Tang plus Halsted and Tang plus cross-stitch techniques demonstrated significantly higher ultimate strength and 2-mm gap formation force compared to Kessler core suture or Tang plus running peripheral suture methods.
• Elastic modulus and energy to failure were also statistically higher with the Tang plus Halsted or cross-stitch techniques.
• The Tang plus Halsted or cross-stitch sutures exhibited the highest overall strength among the evaluated methods.

Conclusions:

• The Tang plus cross-stitch and Tang plus Halsted suture techniques are highly effective for flexor tendon repair.
• These methods provide superior biomechanical strength, making them appropriate for protocols requiring immediate active motion post-surgery.