When deadman theory meets footprint decortication: a suture anchor biomechanical study

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Materials Science

Background:

• The optimal suture anchor insertion angle is crucial for rotator cuff repair success.
• The impact of greater tuberosity decortication on anchor insertion angle remains under investigation.

Purpose of the Study:

• To compare the pullout strength of threaded suture anchors inserted at 45° and 90°.
• To evaluate the influence of decortication on anchor insertion angle and pullout strength.

Main Methods:

• Utilized two synthetic bone models simulating decorticated and non-decorticated conditions.
• Inserted 40 metallic suture anchors at 45° and 90° angles.
• Conducted cyclic loading followed by load-to-failure testing, recording cycles, failure load, and modes.

Main Results:

• Anchors inserted at 90° demonstrated significantly higher ultimate failure loads than those at 45° in both decorticated (114.1 N vs 67.5 N) and non-decorticated (724.9 N vs 591.8 N) models.
• In non-decorticated models, 90° insertion yielded greater pullout strength (781.6 N vs 648.0 N) for suture anchor pullout failure modes.

Conclusions:

• A 90° suture anchor insertion angle provides superior pullout strength compared to a 45° angle.
• The 90° insertion angle is recommended for clinical application in rotator cuff repair, enhancing construct stability.