Tensioning Ligament and Tendon Repairs to Bone Using a Modified Screw-post Technique

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Surgical Techniques

Background:

• Tendon and ligament injuries often require surgical repair or reconstruction.
• Achieving adequate tension in these repairs is crucial for successful healing and joint stability.
• Existing methods for tensioning repairs to bone can be challenging.

Purpose of the Study:

• To demonstrate and evaluate a novel oblique screw-post technique for tensioning tendon and ligament repairs to bone.
• To assess the biomechanical effectiveness of this technique in a simulated model.
• To present clinical case examples of its application.

Main Methods:

• A controlled experiment using a wood frame model to simulate tendon/ligament repair to bone.
• Testing of various initial exposed screw lengths (4-20 mm) and screw angles (30-90 degrees).
• Measurement of system length changes using digital calipers and a force gauge; statistical analysis performed.

Main Results:

• Decreasing screw angle and increasing initial exposed screw length significantly increased system length changes (P<0.05).
• Optimal tensioning (12.4 mm change) was achieved with a 45-degree screw angle and 20 mm initial exposed length.
• Five successful clinical cases of upper extremity tendon/ligament repair using the screw-post are presented.

Conclusions:

• The oblique screw-post technique effectively advances tendon and ligament repairs to bone.
• This method offers a potential for increased repair tension, leading to improved outcomes and joint stability.
• The technique is demonstrated as viable in both experimental and clinical settings.